-----BEGIN PRIVACY-ENHANCED MESSAGE-----
Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
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MIC-Info: RSA-MD5,RSA,
 MJ3uP33nQveEhPuwEf3S2IKBrNigSecVmLutZHdK0n156ATzAKf327ZFFxmkp0Bp
 CXguElZlsaLQklMkjDnBLw==

<SEC-DOCUMENT>0001179110-10-001916.txt : 20100203
<SEC-HEADER>0001179110-10-001916.hdr.sgml : 20100203
<ACCEPTANCE-DATETIME>20100203144228
ACCESSION NUMBER:		0001179110-10-001916
CONFORMED SUBMISSION TYPE:	5
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20100102
FILED AS OF DATE:		20100203
DATE AS OF CHANGE:		20100203

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			WENTZ DAVE
		CENTRAL INDEX KEY:			0001203343

	FILING VALUES:
		FORM TYPE:		5
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-21116
		FILM NUMBER:		10570188

	MAIL ADDRESS:	
		STREET 1:		308 W 300
		STREET 2:		S #203
		CITY:			SALT LAKE CITY
		STATE:			UT
		ZIP:			84101

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			USANA HEALTH SCIENCES INC
		CENTRAL INDEX KEY:			0000896264
		STANDARD INDUSTRIAL CLASSIFICATION:	MEDICINAL CHEMICALS & BOTANICAL PRODUCTS [2833]
		IRS NUMBER:				870500306
		STATE OF INCORPORATION:			UT
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		3838 WEST PARKWAY BLVD.
		CITY:			SALT LAKE CITY
		STATE:			UT
		ZIP:			84120-6336
		BUSINESS PHONE:		8019547100

	MAIL ADDRESS:	
		STREET 1:		3838 WEST PARKWAY BLVD.
		STREET 2:		3838 WEST PARKWAY BLVD.
		CITY:			SALT LAKE CITY
		STATE:			UT
		ZIP:			84120-6336

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	USANA INC
		DATE OF NAME CHANGE:	19930125
</SEC-HEADER>
<DOCUMENT>
<TYPE>5
<SEQUENCE>1
<FILENAME>edgar.xml
<DESCRIPTION>FORM 5 -
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0303</schemaVersion>

    <documentType>5</documentType>

    <periodOfReport>2010-01-02</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <form3HoldingsReported>0</form3HoldingsReported>

    <form4TransactionsReported>1</form4TransactionsReported>

    <issuer>
        <issuerCik>0000896264</issuerCik>
        <issuerName>USANA HEALTH SCIENCES INC</issuerName>
        <issuerTradingSymbol>USNA</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001203343</rptOwnerCik>
            <rptOwnerName>WENTZ DAVE</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>3838 WEST PARKWAY BLVD</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>SALT LAKE CITY</rptOwnerCity>
            <rptOwnerState>UT</rptOwnerState>
            <rptOwnerZipCode>84120</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>C.E.O.</officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2009-04-03</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>G</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>20000</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0.00</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>231209</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>9474</value>
                    <footnoteId id="F1"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>401k</value>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
    </nonDerivativeTable>

    <derivativeTable></derivativeTable>

    <footnotes>
        <footnote id="F1">Between January 3, 2009 and January 2, 2010, the reporting person acquired 143 shares of USANA common stock in transactions pursuant to the issuer's 401(k) plan.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>James Bramble, as attorney in fact</signatureName>
        <signatureDate>2010-02-03</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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