<?xml version="1.0" encoding="UTF-8"?>

<!--XBRL Document Created with the Workiva Platform-->
<!--Copyright 2026 Workiva-->
<!--r:019ecc3e-8b32-7381-9bd5-1b3058921c69,g:032eab09-2fc7-42fd-8f33-43077ccc5632-->
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:med="http://www.medifast1.com/20260930" xmlns:xbrli="http://www.xbrl.org/2003/instance" xmlns:dtr-types="http://www.xbrl.org/dtr/type/2024-01-31" xmlns:xbrldt="http://xbrl.org/2005/xbrldt" attributeFormDefault="unqualified" elementFormDefault="qualified" targetNamespace="http://www.medifast1.com/20260930">
  <xs:import namespace="http://fasb.org/srt/2026" schemaLocation="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd"/>
  <xs:import namespace="http://fasb.org/us-gaap/2026" schemaLocation="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd"/>
  <xs:import namespace="http://www.xbrl.org/2003/instance" schemaLocation="http://www.xbrl.org/2003/xbrl-instance-2003-12-31.xsd"/>
  <xs:import namespace="http://www.xbrl.org/2003/linkbase" schemaLocation="http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd"/>
  <xs:import namespace="http://www.xbrl.org/dtr/type/2024-01-31" schemaLocation="https://www.xbrl.org/dtr/type/2024-01-31/types.xsd"/>
  <xs:import namespace="http://xbrl.org/2005/xbrldt" schemaLocation="http://www.xbrl.org/2005/xbrldt-2005.xsd"/>
  <xs:import namespace="http://xbrl.sec.gov/dei/2026" schemaLocation="https://xbrl.sec.gov/dei/2026/dei-2026.xsd"/>
  <xs:import namespace="http://xbrl.sec.gov/ecd/2026" schemaLocation="https://xbrl.sec.gov/ecd/2026/ecd-2026.xsd"/>
  <xs:annotation>
    <xs:appinfo>
      <link:linkbaseRef xmlns:xlink="http://www.w3.org/1999/xlink" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="med-20260930_pre.xml" xlink:role="http://www.xbrl.org/2003/role/presentationLinkbaseRef" xlink:type="simple"/>
      <link:linkbaseRef xmlns:xlink="http://www.w3.org/1999/xlink" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="med-20260930_def.xml" xlink:role="http://www.xbrl.org/2003/role/definitionLinkbaseRef" xlink:type="simple"/>
      <link:linkbaseRef xmlns:xlink="http://www.w3.org/1999/xlink" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="med-20260930_lab.xml" xlink:role="http://www.xbrl.org/2003/role/labelLinkbaseRef" xlink:type="simple"/>
      <link:linkbaseRef xmlns:xlink="http://www.w3.org/1999/xlink" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="med-20260930_cal.xml" xlink:role="http://www.xbrl.org/2003/role/calculationLinkbaseRef" xlink:type="simple"/>
      <link:roleType id="Cover" roleURI="http://www.medifast1.com/role/Cover">
        <link:definition>0000001 - Document - Cover</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CONDENSEDCONSOLIDATEDSTATEMENTSOFOPERATIONSUNAUDITED" roleURI="http://www.medifast1.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFOPERATIONSUNAUDITED">
        <link:definition>9952151 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CONDENSEDCONSOLIDATEDSTATEMENTSOFCOMPREHENSIVELOSSUNAUDITED" roleURI="http://www.medifast1.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFCOMPREHENSIVELOSSUNAUDITED">
        <link:definition>9952152 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS (UNAUDITED)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CONDENSEDCONSOLIDATEDBALANCESHEETSUNAUDITED" roleURI="http://www.medifast1.com/role/CONDENSEDCONSOLIDATEDBALANCESHEETSUNAUDITED">
        <link:definition>9952153 - Statement - CONDENSED CONSOLIDATED BALANCE SHEETS (UNAUDITED)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CONDENSEDCONSOLIDATEDBALANCESHEETSUNAUDITEDParenthetical" roleURI="http://www.medifast1.com/role/CONDENSEDCONSOLIDATEDBALANCESHEETSUNAUDITEDParenthetical">
        <link:definition>9952154 - Statement - CONDENSED CONSOLIDATED BALANCE SHEETS (UNAUDITED) (Parenthetical)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWSUNAUDITED" roleURI="http://www.medifast1.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWSUNAUDITED">
        <link:definition>9952155 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CONDENSEDCONSOLIDATEDSTATEMENTSOFCHANGESINSTOCKHOLDERSEQUITYUNAUDITED" roleURI="http://www.medifast1.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFCHANGESINSTOCKHOLDERSEQUITYUNAUDITED">
        <link:definition>9952156 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (UNAUDITED)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SUMMARYOFSIGNIFICANTACCOUNTINGPOLICIES" roleURI="http://www.medifast1.com/role/SUMMARYOFSIGNIFICANTACCOUNTINGPOLICIES">
        <link:definition>9952157 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="INVENTORIESNET" roleURI="http://www.medifast1.com/role/INVENTORIESNET">
        <link:definition>9952158 - Disclosure - INVENTORIES, NET</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="EARNINGSPERSHARE" roleURI="http://www.medifast1.com/role/EARNINGSPERSHARE">
        <link:definition>9952159 - Disclosure - EARNINGS PER SHARE</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SHAREBASEDCOMPENSATION" roleURI="http://www.medifast1.com/role/SHAREBASEDCOMPENSATION">
        <link:definition>9952160 - Disclosure - SHARE-BASED COMPENSATION</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LEASES" roleURI="http://www.medifast1.com/role/LEASES">
        <link:definition>9952161 - Disclosure - LEASES</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ACCUMULATEDOTHERCOMPREHENSIVEINCOMELOSS" roleURI="http://www.medifast1.com/role/ACCUMULATEDOTHERCOMPREHENSIVEINCOMELOSS">
        <link:definition>9952162 - Disclosure - ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="INVESTMENTS" roleURI="http://www.medifast1.com/role/INVESTMENTS">
        <link:definition>9952163 - Disclosure - INVESTMENTS</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SEGMENTREPORTING" roleURI="http://www.medifast1.com/role/SEGMENTREPORTING">
        <link:definition>9952164 - Disclosure - SEGMENT REPORTING</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="RESTRUCTURINGANDRELATEDACTIVITIES" roleURI="http://www.medifast1.com/role/RESTRUCTURINGANDRELATEDACTIVITIES">
        <link:definition>9952165 - Disclosure - RESTRUCTURING AND RELATED ACTIVITIES</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESPolicies" roleURI="http://www.medifast1.com/role/SUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESPolicies">
        <link:definition>9955511 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="INVENTORIESNETTables" roleURI="http://www.medifast1.com/role/INVENTORIESNETTables">
        <link:definition>9955512 - Disclosure - INVENTORIES, NET (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="EARNINGSPERSHARETables" roleURI="http://www.medifast1.com/role/EARNINGSPERSHARETables">
        <link:definition>9955513 - Disclosure - EARNINGS PER SHARE (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SHAREBASEDCOMPENSATIONTables" roleURI="http://www.medifast1.com/role/SHAREBASEDCOMPENSATIONTables">
        <link:definition>9955514 - Disclosure - SHARE-BASED COMPENSATION (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LEASESTables" roleURI="http://www.medifast1.com/role/LEASESTables">
        <link:definition>9955515 - Disclosure - LEASES (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ACCUMULATEDOTHERCOMPREHENSIVEINCOMELOSSTables" roleURI="http://www.medifast1.com/role/ACCUMULATEDOTHERCOMPREHENSIVEINCOMELOSSTables">
        <link:definition>9955516 - Disclosure - ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="INVESTMENTSTables" roleURI="http://www.medifast1.com/role/INVESTMENTSTables">
        <link:definition>9955517 - Disclosure - INVESTMENTS (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SEGMENTREPORTINGTables" roleURI="http://www.medifast1.com/role/SEGMENTREPORTINGTables">
        <link:definition>9955518 - Disclosure - SEGMENT REPORTING (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="RESTRUCTURINGANDRELATEDACTIVITIESTables" roleURI="http://www.medifast1.com/role/RESTRUCTURINGANDRELATEDACTIVITIESTables">
        <link:definition>9955519 - Disclosure - RESTRUCTURING AND RELATED ACTIVITIES (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESDetails" roleURI="http://www.medifast1.com/role/SUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESDetails">
        <link:definition>9955520 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="INVENTORIESNETDetails" roleURI="http://www.medifast1.com/role/INVENTORIESNETDetails">
        <link:definition>9955521 - Disclosure - INVENTORIES, NET (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="EARNINGSPERSHAREScheduleofComputationofBasicandDilutedEPSDetails" roleURI="http://www.medifast1.com/role/EARNINGSPERSHAREScheduleofComputationofBasicandDilutedEPSDetails">
        <link:definition>9955522 - Disclosure - EARNINGS PER SHARE - Schedule of Computation of Basic and Diluted EPS (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="EARNINGSPERSHARENarrativeDetails" roleURI="http://www.medifast1.com/role/EARNINGSPERSHARENarrativeDetails">
        <link:definition>9955523 - Disclosure - EARNINGS PER SHARE - Narrative (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SHAREBASEDCOMPENSATIONNarrativeDetails" roleURI="http://www.medifast1.com/role/SHAREBASEDCOMPENSATIONNarrativeDetails">
        <link:definition>9955524 - Disclosure - SHARE-BASED COMPENSATION - Narrative (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SHAREBASEDCOMPENSATIONScheduleofStockOptionsActivityDetails" roleURI="http://www.medifast1.com/role/SHAREBASEDCOMPENSATIONScheduleofStockOptionsActivityDetails">
        <link:definition>9955525 - Disclosure - SHARE-BASED COMPENSATION - Schedule of Stock Options Activity (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SHAREBASEDCOMPENSATIONScheduleofRestrictedStockActivityDetails" roleURI="http://www.medifast1.com/role/SHAREBASEDCOMPENSATIONScheduleofRestrictedStockActivityDetails">
        <link:definition>9955526 - Disclosure - SHARE-BASED COMPENSATION - Schedule of Restricted Stock Activity (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SHAREBASEDCOMPENSATIONScheduleofExpensesDetails" roleURI="http://www.medifast1.com/role/SHAREBASEDCOMPENSATIONScheduleofExpensesDetails">
        <link:definition>9955527 - Disclosure - SHARE-BASED COMPENSATION - Schedule of Expenses (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LEASESNarrativeDetails" roleURI="http://www.medifast1.com/role/LEASESNarrativeDetails">
        <link:definition>9955528 - Disclosure - LEASES - Narrative (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LEASESScheduleofSupplementalCashFlowInformationDetails" roleURI="http://www.medifast1.com/role/LEASESScheduleofSupplementalCashFlowInformationDetails">
        <link:definition>9955529 - Disclosure - LEASES - Schedule of Supplemental Cash Flow Information (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LEASESScheduleofFutureMinimumLeaseCommitmentsDetails" roleURI="http://www.medifast1.com/role/LEASESScheduleofFutureMinimumLeaseCommitmentsDetails">
        <link:definition>9955530 - Disclosure - LEASES - Schedule of Future Minimum Lease Commitments (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LEASESScheduleofFutureMinimumLeaseCommitmentsDetails_1" roleURI="http://www.medifast1.com/role/LEASESScheduleofFutureMinimumLeaseCommitmentsDetails_1">
        <link:definition>9955530 - Disclosure - LEASES - Schedule of Future Minimum Lease Commitments (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ACCUMULATEDOTHERCOMPREHENSIVEINCOMELOSSDetails" roleURI="http://www.medifast1.com/role/ACCUMULATEDOTHERCOMPREHENSIVEINCOMELOSSDetails">
        <link:definition>9955531 - Disclosure - ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="INVESTMENTSScheduleofCashandFinancialAssetsMeasuredatFairValueonaRecurringBasisDetails" roleURI="http://www.medifast1.com/role/INVESTMENTSScheduleofCashandFinancialAssetsMeasuredatFairValueonaRecurringBasisDetails">
        <link:definition>9955532 - Disclosure - INVESTMENTS - Schedule of Cash and Financial Assets Measured at Fair Value on a Recurring Basis (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="INVESTMENTSNarrativeDetails" roleURI="http://www.medifast1.com/role/INVESTMENTSNarrativeDetails">
        <link:definition>9955533 - Disclosure - INVESTMENTS - Narrative (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SEGMENTREPORTINGNarrativeDetails" roleURI="http://www.medifast1.com/role/SEGMENTREPORTINGNarrativeDetails">
        <link:definition>9955534 - Disclosure - SEGMENT REPORTING - Narrative (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SEGMENTREPORTINGScheduleofSegmentReportingInformationbySegmentDetails" roleURI="http://www.medifast1.com/role/SEGMENTREPORTINGScheduleofSegmentReportingInformationbySegmentDetails">
        <link:definition>9955535 - Disclosure - SEGMENT REPORTING - Schedule of Segment Reporting Information, by Segment (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="RESTRUCTURINGANDRELATEDACTIVITIESNarrativeDetails" roleURI="http://www.medifast1.com/role/RESTRUCTURINGANDRELATEDACTIVITIESNarrativeDetails">
        <link:definition>9955536 - Disclosure - RESTRUCTURING AND RELATED ACTIVITIES - Narrative (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="RESTRUCTURINGANDRELATEDACTIVITIESScheduleofRestructuringandRelatedChargesRecognizedDetails" roleURI="http://www.medifast1.com/role/RESTRUCTURINGANDRELATEDACTIVITIESScheduleofRestructuringandRelatedChargesRecognizedDetails">
        <link:definition>9955537 - Disclosure - RESTRUCTURING AND RELATED ACTIVITIES - Schedule of Restructuring and Related Charges Recognized (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="RESTRUCTURINGANDRELATEDACTIVITIESScheduleofRestructuringandRelatedChargesDetails" roleURI="http://www.medifast1.com/role/RESTRUCTURINGANDRELATEDACTIVITIESScheduleofRestructuringandRelatedChargesDetails">
        <link:definition>9955538 - Disclosure - RESTRUCTURING AND RELATED ACTIVITIES - Schedule of Restructuring and Related Charges (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="RESTRUCTURINGANDRELATEDACTIVITIESScheduleofRestructuringandRelatedChargesDetails_1" roleURI="http://www.medifast1.com/role/RESTRUCTURINGANDRELATEDACTIVITIESScheduleofRestructuringandRelatedChargesDetails_1">
        <link:definition>9955538 - Disclosure - RESTRUCTURING AND RELATED ACTIVITIES - Schedule of Restructuring and Related Charges (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
    </xs:appinfo>
  </xs:annotation>
  <xs:element id="med_OperatingLeaseExpenseNonCash" abstract="false" name="OperatingLeaseExpenseNonCash" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="med_NoncashRestructuringChargesExcludingShareBasedCompensation" abstract="false" name="NoncashRestructuringChargesExcludingShareBasedCompensation" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="med_DividendsForfeited" abstract="false" name="DividendsForfeited" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="med_IncomeTaxExpenseBenefitLessThan" abstract="false" name="IncomeTaxExpenseBenefitLessThan" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="med_InventoryNonFoodFinishedGoods" abstract="false" name="InventoryNonFoodFinishedGoods" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="med_NumeratorAbstract" abstract="true" name="NumeratorAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="med_DenominatorAbstract" abstract="true" name="DenominatorAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="med_CommonStockEquivalentsWouldHaveBeenDilutiveIfNotInNetLossPosition" abstract="false" name="CommonStockEquivalentsWouldHaveBeenDilutiveIfNotInNetLossPosition" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="med_MarketAndPerformanceBasedShareMember" abstract="true" name="MarketAndPerformanceBasedShareMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="med_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesEarnedPercentage" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesEarnedPercentage" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="med_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesEarnedPerformancePeriod" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesEarnedPerformancePeriod" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="med_OptionsAndRestrictedStockMember" abstract="true" name="OptionsAndRestrictedStockMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="med_GrantedIn2026Member" abstract="true" name="GrantedIn2026Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="med_GrantedIn2025Member" abstract="true" name="GrantedIn2025Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="med_GrantedIn2024Member" abstract="true" name="GrantedIn2024Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="med_GrantedIn2023Member" abstract="true" name="GrantedIn2023Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="med_OperatingLeaseArrangementForRealEstateMember" abstract="true" name="OperatingLeaseArrangementForRealEstateMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="med_OperatingLeaseArrangementForEquipmentMember" abstract="true" name="OperatingLeaseArrangementForEquipmentMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="med_NewHeadquartersOfficeInBaltimoreMarylandMember" abstract="true" name="NewHeadquartersOfficeInBaltimoreMarylandMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="med_MarylandDistributionFacilityMember" abstract="true" name="MarylandDistributionFacilityMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="med_FTWAndOMICLeaseMember" abstract="true" name="FTWAndOMICLeaseMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="med_RightOfUseAssetsDerecognizedUponEarlyTermination" abstract="false" name="RightOfUseAssetsDerecognizedUponEarlyTermination" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="med_OperatingLeaseLiabilitiesDerecognizedUponEarlyTermination" abstract="false" name="OperatingLeaseLiabilitiesDerecognizedUponEarlyTermination" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="med_LesseeOperatingLeaseRightOfUseAssetsObtainedInExchangeForLeaseObligationAbstract" abstract="true" name="LesseeOperatingLeaseRightOfUseAssetsObtainedInExchangeForLeaseObligationAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="med_RightOfUseAssetsDerecognizedUponEarlyTerminationAbstract" abstract="true" name="RightOfUseAssetsDerecognizedUponEarlyTerminationAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="med_LeaseLiabilitiesDerecognizedUponEarlyTerminationAbstract" abstract="true" name="LeaseLiabilitiesDerecognizedUponEarlyTerminationAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="med_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFour" abstract="false" name="LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFour" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="med_CashAndCashEquivalentsAndMarketableSecuritiesTable" abstract="true" name="CashAndCashEquivalentsAndMarketableSecuritiesTable" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType"/>
  <xs:element id="med_CashAndCashEquivalentsExcludingMoneyMarketFundsMember" abstract="true" name="CashAndCashEquivalentsExcludingMoneyMarketFundsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="med_CashAndCashEquivalentsAndMarketableSecuritiesLineItems" abstract="true" name="CashAndCashEquivalentsAndMarketableSecuritiesLineItems" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="med_DebtSecuritiesAvailableForSaleAccruedInterest" abstract="false" name="DebtSecuritiesAvailableForSaleAccruedInterest" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="med_CashCashEquivalentsAndShortTermInvestmentsFairValueDisclosure" abstract="false" name="CashCashEquivalentsAndShortTermInvestmentsFairValueDisclosure" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="med_LifeMDMember" abstract="true" name="LifeMDMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="med_TrilivySegmentMember" abstract="true" name="TrilivySegmentMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="med_SegmentReportingInformationBySegmentTable" abstract="true" name="SegmentReportingInformationBySegmentTable" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType"/>
  <xs:element id="med_EliminationsAndReconcilingItemsMember" abstract="true" name="EliminationsAndReconcilingItemsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="med_SegmentReconcilingItemLocationAxis" abstract="true" name="SegmentReconcilingItemLocationAxis" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType"/>
  <xs:element id="med_SegmentReconcilingItemLocationDomain" abstract="true" name="SegmentReconcilingItemLocationDomain" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="med_CostOfSales1Member" abstract="true" name="CostOfSales1Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="med_DistributionMember" abstract="true" name="DistributionMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="med_TechnologyMember" abstract="true" name="TechnologyMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="med_AdministrativeAndCorporateMember" abstract="true" name="AdministrativeAndCorporateMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="med_EquityCompensationMember" abstract="true" name="EquityCompensationMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="med_SegmentReportingInformationBySegmentLineItems" abstract="true" name="SegmentReportingInformationBySegmentLineItems" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="med_DistributionExpenses" abstract="false" name="DistributionExpenses" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="med_NonCashRestructuringGainLossOnDisposalOfFixedAssets" abstract="false" name="NonCashRestructuringGainLossOnDisposalOfFixedAssets" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="med_ShareBasedPaymentArrangementExpenseReversal" abstract="false" name="ShareBasedPaymentArrangementExpenseReversal" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="med_NonCashRestructuringCharges" abstract="false" name="NonCashRestructuringCharges" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
</xs:schema>
