Controlling blood sugar levels is key to losing weight. Eating foods high in calories but low in nutrients, like double cheeseburgers and fries, cause blood sugar spikes and more hunger. Avoiding sugary foods and refined carbs for breakfast, lunch and snacks helps stabilize blood sugar. Canned and boxed foods also cause blood sugar spikes due to their fast digestion. Eating whole grains, fruits and vegetables stabilizes blood sugar since they digest slowly and control hunger throughout the day.