There are many different diets/eating healthy but I would say "Avoiding all fats" is probably the worst thing to do, you still need your good fats (Unsaturated fats). You could normally find those fats in avocados, nuts (almonds, hazelnuts, and pecans), Oils (olive oil for example), and even seeds (pumpkin and sesame seeds). If you avoid your unsaturated fats that could be really bad for you due to unsaturated fats normally help you avoid/reduce the risk of heart disease and even lower cholesterol levels.