I try to keep my carbs below 100 g a day and fat below 30 g a day. I eat 1200 calories a day and aim mostly for lean protein (fish). I noticed that eating this way allows for regular bowel movements and feeling satiated but also energized. Right now, my diet consists entirely of fish, fruit, vegetables, cheese, nuts and oatmeal. All other foods are banned. I just want to know if this is sustainable/healthy long term. Any nutrition experts here?