When I have been unable to maintain my weight it turned out a medication I was taking was considered a stimulant, and killed my appetite. I did not notice my appetite was down.
Then the next thing that did it was I discovered I had Celiac disease, which keeps you from absorbing nutrition and calories.
Are you too thin or are you trying not to gain lost weight?
I'm trying to keep down lost weight I used to weigh 207 pounds and I'm now down to 170