1.TheBMI(BodyMassIndex)formulacalculatesthebody'sweight-to-heightratiobydividingweightinkilogramsbythesquareofheightinmeters,representedasBMI=weight(kg)/height(m)^2.2.TheBodyMassIndexisaninternationalstandardusedtomeasureanindividual'sweightinrelationtotheirheight,assessingwhetherapersonfallswithinahealthyweightrange.3.AccordingtoChinesestandards,anormalBMIrangeis18.5to24.9kg/m^2.ABMIof24to27.9kg/m^2isconsideredoverweight,whileaBMIof28kg/m^2orhigherisclassifiedasobese.Conversely,aBMIlessthan18.5kg/m^2isconsideredunderweight.4.However,BMIdoesnotprovidedetailedinformationonthedistributionofbodyfatnordistinguishbetweenmuscleandfatcontent,whichmayleadtomisinterpretationsofhealthstatus.5.Toobtainamorecomprehensiveassessmentofhealth,thefollowingmethodscanbecombined:5.1IdealWeight:Calculatedbysubtracting105or100×0.9(formales)or×0.85(forfemales)fromtheheightincentimeters.Thenormalrangeforidealweightis±10%,withoverweightdefinedasmorethan10%-19.9%andobesityasmorethan20%.5.2WaistCircumference:Measuredinanuprightposition,withfeetapart25-30cm,themeasurementtakenatthemidpointofthelinebetweentheanteriorsuperioriliacspineandthelowerborderofthetwelfthrib.Normalwaistcircumferenceformalesshouldbelessthan85cm,andforfemales,lessthan80cm.5.3Waist-to-HipRatio:Measuredbywrappingatapemeasurearoundthehipsatthewidestpointandcomparingittothewaistcircumference.Formales,thewaist-to-hipratioshouldbelessthan0.9,andforfemales,lessthan0.85.5.4ImagingTests:SuchasCTorMRI,canbeusedtoconfirmbodyfatlevelsandassessthedistributionofintra-abdominalfat.5.5OtherMethods:Dual-energyX-rayabsorptiometry(DXA),bioelectricalimpedanceanalysis,etc.,canalsobeusedtocomprehensivelydeterminebodyfatcontentandevaluatehealthstatus.6.Beingunderweightoroverweightisdetrimentaltohealth.Individualswhoareunderweightshouldaimtoimprovetheirconditionbyincreasingmusclemass,consumingadequateamountsofhigh-protein,qualityfats,andhigh-caloriefoods(suchasmeat,eggs,etc.),andmaintainingabalanceddiet.7.Thosewhoareoverweightcanreduceweightthroughmethodssuchasexercise(yoga,jogging,swimming,walking),adjustingdietarypatterns,andcontrollingcalorieintake.