Buspar can indirectly lead to weight gain through changes to your eating habits as your anxiety improves.
An increased appetite is a noted side effect of Busparin in less than 1% of cases, but when it does occur, it can lead to more frequent or larger meals, thus contributing to weight gain.
Clinical trials on the use of Buspar in people with Autism to reduce irritability demonstrated that increased appetite was actually one of the more common side effects in that population.
To lower the chances of losing or gaining while taking Buspar, be conscious of your eating habits while on the medication. Track the number of calories you consume each day to help determine if you’re eating the right amount of food to achieve the appropriate body mass.