Strategies for Successful Weight Loss include consistently balancing the three food groups to change your body’s physiology from the inside out, along with proper portion control. Choosing the right foods is pretty straightforward. The key is to select low glycemic carbohydrates including fruits and vegetables, lean proteins, such as lean meats, and low-fat dairy, limiting saturated and trans fats. What is a normal or “healthy” portion of food? The National Institute of Health defines a portion as “…the amount of food that you choose to eat for a meal or snack.” Therefore, the portion size depends entirely on the consumer. The size is determined by calorie restriction, food groups and hunger level.