He lost weight with diet and exercise.
他通过节食和锻炼减肥。
He lost weight after his illness but is beginning to flesh out again.
他病后体重减轻了，但现在又开始胖起来。
The only reason why he lost weight was because we had changed our diet recently and started eating seafood instead of meat.
他失去了体重的唯一原因，是因为最近我们改变了饮食，转而开始吃海鲜而不是肉类。
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