the more processed it is, the worst it is. So stick to things that are as closely to its original form as possible. For example, fruits (not canned) veggies, chicken breast, ect.
One common mistake done by people who want to lose weight is to skip meals. They fail to realize that there are foods that they can eat to help them lose weight, it includes apples, nuts, oats and even chillis too. Eat more vegetables and fruits rather than processed foods.