Mayer估计美国学校人群中约有10％太胖,一些中学甚至可高达20％,低年级比高年级的少。许多男孩到青春期年龄或青春前期时增胖,但随着青春期生长的突增而肥胖消失。女孩正常皮下脂肪厚度在各年龄组均比男孩厚,且随年龄的增长而增加。认为肥胖是因吃得过多和缺乏锻炼所致,因而采取尽量少吃多锻炼的作法是过于简单化。肥胖与遗传的体型有关。尤其与内胚 Mayer estimates that about 10% of school populations in the United States are too fat, some even up to 20% in high schools, and less in lower grades than in upper grades. Many boys gain weight by adolescence or pre-adolescence, but obesity disappears as adolescent growth spikes. The normal thickness of subcutaneous fat in girls is thicker than boys in all age groups and increases with age. To think that obesity is caused by eating too much and lacking in exercise, it is too simplistic to take as little as possible more exercise. Obesity and genetic body size. Especially with endoderm