This could lead to up and down weight loss and gain, which is bad for your health.

这将导致体重不稳定的减少和增加，从而不利于健康。

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Trying to live up to the images of "perfect" models and movie heroes has a dark side: anxiety and depression, as well as unhealthy strategies for weight loss or muscle gain.

试图达到“完美”的模特和电影英雄形象也有阴暗面：造成焦虑和抑郁，以及选择不健康的减肥或增肌策略。

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Rather than studying weight loss in overweight or obese individuals, scientists looked at how certain activities and diet affected weight gain over several years.

过去几年中科学家研究了某些活动和饮食对体重增加的影响，没有研究超重或肥胖者减肥的个案。

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These include weight gain or loss, eye or stomach problems, sleepiness and loss of balance.

VOA: special.2010.10.26

So, some women can develop irregular cycles because of medical conditions such as thyroid abnormalities, but both weight loss and weight gain can play a role as can stress.

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Some popular diabetes drugs come with side effects including weight gain, bone loss and even a small risk of certain cancers.

WSJ: New Strategies for Treating Diabetes

As they age rapidly, these children suffer from a loss of body fat and hair and an inability to gain weight.

CNN: Advances in kids' early aging disease