Our expert says:
Its hard to be sure exactly why some pople on Lithium, or on various antidepressants, or indeed a number of other drugs, gain weight. Some do and some don't --- it isn't a universal effect. And people who may gain weight on one AD, may not do so on a similar AD. Part of it may be that where depression led to loss of appetite and loss of weight, a return to normalcy includes an increase in weight ; but obviously this doesn't explain many other cases. Attending to diet and exercise can help, and the extra is often lost when one comes off one's meds, if one continues wise diet and exercise.
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