Ahealthydietisonethathelpsmaintainorimprovehealth.Itisimportantforthepreventionofmanychronichealthriskssuchas:obesity,heartdisease,diabetes,andcancer.Ahealthydietinvolvesconsumingappropriateamountsofallnutrients,andanadequateamountofwater.Nutrientscanbeobtainedfrommanydifferentfoods,sothereareawidevarietyofdietsthatmaybeconsideredhealthydiets.Ahealthydietneedstohaveabalanceofmacronutrients/energy(fats,proteins,andcarbohydrates)andmicronutrientstomeettheneedsforhumannutritionwithoutinducingtoxicityfromexcessiveamounts.

　　Thereareanumberofdietsandrecommendationsbynumerousmedicalandgovernmentalinstitutionsthataredesignedtopromotecertainaspectsofhealth,includingWorldHealthOrganizationandAmericanHeartAssociation,

　　Fromapsychologicalandculturalperspective,ahealthierdietmaybedifficulttoachieveforpeoplewithpooreatinghabits.Thismaybeduetotastesacquiredinearlyadolescenceandpreferencesforsugaryandfattyfoods.Itmaybeeasierforsuchapersontotransitiontoahealthydietiftreatssuchaschocolateareallowed;sweetsmayactasmoodstabilizers,whichcouldhelpreinforcecorrectnutrientintake.

　　Itisknownthattheexperienceswehaveinchildhoodrelatingtoconsumptionoffoodaffectourperspectiveonfoodconsumptioninlaterlife.[citationneeded]Fromthis,weareabletodetermineourselvesourlimitsofhowmuchwewilleat,aswellasfoodswewillnoteat-whichcandevelopintoeatingdisorders,suchasanorexiaorbulimiaThisisalsotruewithhowweperceivethesizesofthemealsoramountsoffoodweconsumedaily;peoplehavedifferentinterpretationsofsmallandlargemealsbasedonupbringing.

　　Yo-yodietingispsychologicalupsettingforpeopleandmakealackofselfconfidence.Researchersfrom8countriesinEuropehavefoundrelationbetweenangiotensine-convertingenzymewiththewoman'sweight.Thehighertheenzymemakewomenkeptthepoundoff.ThejournalPLoSONEreportedthatthereare8otherproteinswerealsolinkedtosuccessfulweightmaintenance.Theresearchnowfocustostrategiesthatpeopleneedtokeeptheweightoffinthelongtermratherthangettinginitialweightloss.