The Mono Diet is a restrictive diet where you only eat one type of food. That could be one type of fruit or one type of vegetable or any type of food at all. There is a Youtuber named “Freelee the Banana Girl: who eats upwards of 30 bananas every day and nothing else. While eating one type of food may sound like a way that you could lose weight it is truly not a good idea. The idea has been around for many decades, and some actors have even used this plan to lose weight quickly for a certain role. Apparently, actor Matt Damon ate only chicken breasts to lose weight for a particular movie role.