Many toxic chemicals, such as pesticides, concentrate themselves in body fat. 許多有毒的化學物質,像是殺蟲劑,會累積在體脂肪。
Sleep deprivation alters levels of the hormones that regulate food intake and body fat and increase hunger and appetite. 缺乏睡眠會改變體內控制食物攝取和體脂肪的激素水平,增加飢餓感,促進食慾。