About70millionAmericansaretryingtoloseweight.Thatisalmost1outevery3peopleintheUnitedStates.(3)Somepeoplegoondiets.Thismeanstheyeatlessofcertainfoods,especiallyfatsandsugars.Otherpeopleexercisewithspecialequipmen

　　About70millionAmericansaretryingtoloseweight.Thatisalmost1outevery3peopleintheUnitedStates.(3)Somepeoplegoondiets.Thismeanstheyeatlessofcertainfoods,especiallyfatsandsugars.Otherpeopleexercisewithspecialequipment,takedietpills,orevenhavesurgery.Losingweightishardwork,anditcanalsocostalotofmoney.SowhydosomanypeopleintheUnitedStateswanttoloseweight?

　　ManypeopleintheUnitedStatesworryaboutnotlookingyoungandattractive.Formanypeople,lookinggoodalsomeansbeingthin.Otherpeopleworryabouttheirhealth.Manydoctorssaybeingoverweightisnothealthy.ButareAmericansreallyfat?

　　(4)Almost30millionAmericansweighatleast20percentmorethantheiridealweight.Infact,theUnitedStatesisthemostoverweightcountryintheworld.“ThestoredfatofadultAmericansweighs2.3trillionpounds,”saysUniversityofMassachusettsanthropologist(人类学家)GeorgeArmelagos.Hesaysburningoffthatstoredenergywouldproduceenoughpowerfor900,000carstogo12,000miles.

　　Losingweightishardwork,butmostpeoplewanttofindafastandeasywaytotakeofffat.Bookstoresselllotsofdietbooks.Thesebookstellreadershowtoloseweight.Eachyear,dozensofnewbookslikethesearewritten.Eachonepromisestogetridoffat.