Fruits are very nutritious and contain lots of fiber and antioxidants. However, some people think they can be harmful because of the sugar in. Fruit is healthy, but can also slow or stop fat loss if eaten too much, too often. Some fruit can be part of a fat loss diet, but the amount and type. We have a list of the 10 best and the 10 worst fruits for. If you enjoy fruits frequently, that's great. Remember, fruit is healthy and delicious.