The Sirtfood diet allows you to drink green smoothies and eat foods with so-called sirtuins, which may boost metabolism, decrease ...Diet&NutritionWhatIstheSirtfoodDiet?RegisteredDietitiansExplainthePlanBehindAdele’sWeightLossBy JessicaMigalaMedicallyReviewedby LynnGrieger,RDN,CDCESLastUpdated:June12,2020MedicallyReviewedAregreensmoothiesresponsiblefortheGrammywinner'sdramaticphysicaltransformation?KevorkDjansezian/GettyImages;iStockAdelemademouthsdropwhenshereleasedaplayfulphotoofherselfinMayonsocialmedia,thefirstphotoshehadpostedsinceChristmas2019,lookingnoticeablythinner,accordingto People. (1)Indeed,accordingtothepublication,theGrammyAward–winningBritishsingerhaslost100pounds.Andthat’swhypeoplearenowbuzzingabouttheSirtfooddiet,whichreportedlyisresponsibleforhelpingherloseweight.Supposedlythisisn’tthefirsttimeAdelehasgoneonthediet.Shesuccessfullylostweightin2017byfollowingtheSirtfoodplan,accordingtohertrainerPeteGeracimo,alsoreportedin People.(2)So,whatistheSirtfooddiet,anddoesitreallywork?Thetwo-phaseeatingplanasksdieterstoconsumegreenjuiceandmealsthatfocuson20foodssaidtoberichinsirtuins.There’slimitedresearchonthisdiet,buthere’swhatyouneedtoknowifyou’reconsideringthisfaddiet.WhatAreSirtuinsandWhyShouldIConsiderEatingThem?TheSirtfoodDietbookwaswrittenbyAidanGogginsandGlenMattenandpublishedin2017.It’scenteredoneatingfoodsthatarerichsourcesofproteinscalledsirtuins,whichtheauthorssayswitchon“skinny”genes.(3)“Sirtuinshelpregulateavarietyoffunctionsinthebodyonacellularlevel.Theyplayanimportantroleinmetabolismandpossiblydecreaseinflammationandaging,”saysShelbyBurns,aregistereddietitiannutritionistinBoston.Theauthorsrecommendveryspecificfruitsandvegetablesonthisdiet.TheyciteastudypublishedinJanuary2016intheBMJthatanalyzedflavonoidintake(theseareplantchemicalswithantioxidantproperties)andhowdifferentflavonoidsareassociatedwithweightloss.(4)TheSirtfoodDietauthorsdrawtheconclusionthatnotallantioxidantsinthedietarecreatedequal,andtheirdietisbuiltaroundproducethatactivatess