A. Mono diet is a diet where a single food product is consumed for days or weeks. It is a type of diet that claims weight loss. It might help short-term weight loss but is very harmful in the long run. The main disadvantage of this diet is that you deprive yourself of nutrients and important vitamins and minerals. There might be a way to do it, but not an advisable way of weight loss. There are better diets that can help you lose weight and be healthy.