Fruits are very nutritious and contain lots of fiber and antioxidants. However, some people think they can be harmful because of the sugar in. Food Companies and Refined Sugar. In drawing us to fruit, our sweet tooth was designed to support our long-term health; however, food. You won't be surprised to hear this wasn't the first time I'd heard this 'sugar in fruit = bad' idea. This thought that fruit is somehow a bad thing to.