Is it ok to drink full fat milk twice a day? I'm increasing my bodyweight. I'm 33 years old and 85 kgs. Body is lean but stomach is too much fat

Weight gain. If you are gaining weight around your abdomen, you are increasing your risk of bad metabolic diseases, such as heart disease or diabetes, down the road. If you are drinking whole milk twice a day, you should consider decreasing or stopping it completely, since it has many calories. There is no need to drink milk if you are gaining weight like you describe. Good luck.