I have been tracking what I eat religiously with an app and am doing a 500 calorie deficit. Here is what happened. I started out 250 pounds, started doing a 500 calorie deficit and was losing weight. I got down 238 pounds after 1 month. Kept eating in a deficit 500 calories per day or less. After 6 months I now weigh 255 pounds. So how the heck did I gain weight after 6 months eating in a deficit? Lol