I also see in chronic alcoholics , who become hypoglycemic because their glycogen stores are so low. This is because of low carbohydrate intake.
Total anecdotal observation but many ex-alcoholics have a very high consumption of sweets, know one in particular that used to go through a tin of roses a week.
Most drugs that increase dopamine in any significant way cause weight loss, at least initially. The reward centres of the brain are the lynch pin of obesity. This is a very cutting edge theory but is rapidly gaining consensus in the bariatric research community.