Mono diet came into the discussion when the claims were made that it can lead to easy and quick weight loss. But there is no proven fact to say this.
People who follow the mono diet eat only one type of food (like bananas or potatoes) to try to lose weight. There’s no scientific evidence supporting this type of diet. In addition, nutrition professionals warn that it can lead to nutrient deficiencies and that any pounds shed will include lost muscle.

Also known as the monostrophic diet, the mono diet is an eating pattern involving eating just one food item or group for several days or weeks at a time.

The most common examples of foods included in the mono diet: are potatoes, apples, eggs, milk, bananas, pears, watermelon, chocolate, and grapefruit.
Some variations of the mono diet also involve consuming just one food group throughout the day. Some examples of food groups that can fit into a mono diet: are meats, fruits, vegetables, and legumes.