Dont trust it.

Got this because my wife has to avoid high fructose foods and the like. This app lists foods as being acceptable when they are absolutely not. i,e: It says sweet potatoes are allowed but they are actually forbidden on these diets. Such discrepancies could and have caused major discomfort to people who need to know exactly what they can and cannot eat. Do it the right way and go visit a dietician instead.

Morty Rockitt about Food Intolerances