The answer is that white kidney beans consist both from proteins and carbs. They have plant-based proteins that have the best effects on your appearance, while also having carbohydrates in the forms of dietary fibers, the way you find them in most vegetables and fruits. As a result, their carbs are just motivating your gut, since they cannot turn into sugar from your body. That is why they help a lot of people who want to lose weight and control their appetite for foods throughout the day.