can result from a diet that is rich in fat and sugar.

Obesity 意為「肥胖」。高脂肪、高糖分的飲食若長期攝取過量，可能使熱量攝取超過消耗，進而導致體重增加與肥胖，完全符合題幹 can result from a diet that is rich in fat and sugar 的語意。