Eli5: If gaining weight is simply the result of calories in and out, then why does taking certain medications (birth control, anti-depressants) commonly lead to weight gain?
In: Biology
A medication might cause you to gain weight if it:
* Makes you hungrier
* Makes you not feel full as long
* Gives you cravings for sugar or fat, even if the volume of food you eat doesn’t change
* Makes you more tired, so you spend less time exercising
* Fixes a problem that was preventing you from eating/digesting properly
* Decreases your resting metabolism (lowering thyroid hormone for example)
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