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You can't gain weight without eating more. According to Why Does Lithium Cause Weight Gain? lithium binds to a receptor 5-HT1B which influences the serotonine system influencing your mood, and also your appetite. This is the 1999 paper by Olivier Massot they refer to 5-HT1B Receptors: A Novel Target for Lithium: Possible Involvement in Mood Disorders.
I've been on Lithium for about a year now. Originally my doctor had me up to 600mg because I could not tolerate more. Over the course of 6mo I went from 210lbs to 175lbs because I had little appetite and was experiencing a lot of gastro side effects. He then put me up to 900mg and thats when my weight.