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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.
A: Lithium is commonly used to mania episodes in people who suffer from manic-depressive disorder. Common side effects associated with Lithium can include hair loss, mild hand tremor, weakness, lack of coordination, mild nausea, vomiting, lack of appetite, stomach pain, and itchy skin.