gain weight 体重增加；增肥；长胖了

【例句】
This makes you gain weight and lose energy, and may raise your risk of several diseases.
这使得你体重增加而能量丧失，并可能提高若干疾病的风险。

In contrast those whose mothers were untreated gain weight and develop diabetes.
相反，那些没有喂养瘦素母亲所生后代，体重增加并发展为糖尿病。