People with bipolar disorder, regardless of medication, are, on average, heavier than the average person. This is likely due to sedentary lifestyles and poor dietary choices due, in part, to reduced income. I suspect it’s also because of untreated and undertreated people exhibiting major depression and never getting off the couch (something I know a lot about).
But then, of course, there are the side effects from medication and one of the big ones that effects people drastically is weight gain. Antipsychotics, in particular, can make a person put on a lot of weight and fast. (Tip: the antipsychotic that was newly approved in bipolar disorder, lurasidone, has been shown to be weight-neutral.)
And while many people work very hard to try to lose it, the fact of the matter is, most can’t. Losing weight is something that is tough in the average population let alone in a medicated one. So sometimes, acceptance is the only answer.