The presence of added sugars, fats, and carbs in some foods can be detrimental to the ability to lose belly fat. Starchy and sugary foods are calorie-dense and easy to overeat. Nuts, granola, Nutella, candy like snickers, dried figs and other candied fruits, ice cream, cheese, ketchup, and fast food such as big Macs are just some examples. These foods can contribute a lot to your overall caloric intake very quickly and hence create hurdles in achieving a caloric deficit which is a key factor in losing weight.