Asanation,weloveeatingcarbs,andtheyarerightattheheartofourdiet.Theproblemisthatwith63percentofUKadultsnowconsideredoverweightorobese,manyexpertsthinkthatweareeatingfartoomanywrongsortsofcarbohydrate.　　XandvanTullekenisamedicaldoctorandself-professedloverofcarbs,tothepointwhereheusedtoweigh19stone.Heiskeentodiscoverwhethertheyreallyareakillerasclaimedbymany,responsibleforrecordlevelsofobesityandtype2diabetes.Thefilminvestigatescutting-edgeresearchintothepossiblelinkbetweencarbconsumptionandinfertilityinbothwomenandmen,andlooksintowhethergeneticchangesaretakingplaceaswepassoureatinghabitsontoourchildren.　　Xandandateamofvolunteersplay'bloodsugarbingo'astheyattempttoguesshowmuchsugaraselectionofcommonfoodseachreleasesintothebloodstream.Xanddiscoversthatlookscanbedeceiving-abakedpotatoistheequivalentofastaggering19sugarlumps,whereasalargebowlofstrawberriesisonlyfour.Thereisalsoasimpletestthatanyonecandoathometodeterminehowwelltheytoleratestarchycarbslikerice,pastaandbread.Simplychewasmall,unsaltedcrackerandtimehowlongittakestochangetasteinthemouth.　　Thefilmthensetsouttoexaminewhetheritisstillpossibletoeatcarbs,butinawaythatismuchhealthierforus.Thereisalittle-knowntypeofcarbohydratecalledresistantstarch;likefibre,ithelpskeepbowelcanceratbay.Butamedicalexamrevealsthat,likemostpeopleintheUK,Xanddoesn'teatenoughofthiscarb.Sohowshouldhegoabouteatingmorecarbslikefibreandresistantstarch?　　Theprogrammeturnsthemythaboutbreadonitshead,discoveringbakesthataregoodforus.Thereisevenawayofmakingwhitebreadhealthierbystickingitinthefreezerbeforetoastingit-thisprocessturnssomeofthesugarystarchintoresistantstarch.Scientistshavediscoveredthatotherstarchycarbslikepasta,riceandpotatoescanbechangedinaverysimplewaytomakethembetterforus,bycookingandcooling-theybecomelesscalorificandvitalfoodforourgutbacteria.　　ThereisasurpriseinstoreforXandwhenheheadstothegymwithhisfavouritecarb-filledsportsdrink.Hediscoversthatforexerciselastinglessthananhour,thereisaveryneattrickthatfoolsthebrainintothinkingthatitisgoingtogetcarbs,whichimprovesperformance.Allhehastodoisswillthedrinkandspititout.　　Butperhapsmostimportantly,theprogrammeteamsupwithaMerseysideGPtotrialahealthy-eatingplan.Originallydevisedtohelpdiabeticandobesepatients,thisplandoesn'tcountcaloriesbutasksparticipantstobesmartwiththeircarbs-swapping'sugary'carbsformorefibre.TheresultsafterjusttwoweekscomeasasurprisetoXandandthetrialdoctors.