You can definitely be thin, but how thin you are depends on your weight base and your previous eating habits. In fact, the calorie of oats is 367 calories (per kloc-0/00g). If you make porridge, you can drink oatmeal and milk porridge, 83 calories (per kloc-0/00g). The calories are not high, and there is a feeling of fullness, that is, without vegetables, it is difficult to balance nutrition. You can eat more vegetables in moderation, such as 33 calories of vegetarian fried celery (100g).