Weight Watchers uses a PointsPlus system to help dieters measure daily food intake and to encourage them to make healthier choices. The PointsPlus system assigns a point value to different foods, which is calculated by its protein, carbohydrate, fat, fiber and calorie content, as well as by how difficult it is for the body to work it off. Each dieter is given a unique PointsPlus target according to their gender, height, weight and weight loss goals. You can basically eat whatever you want on the Weight Watchers program, as long as you stay within your daily PointsPlus target, but you are encouraged to eat more "Power Foods," which are considered the healthiest and most filling. "Power Foods" include whole grains, lean meats, low-fat dairy and (unlimited quantities of) fresh fruit and non-starchy veggies.
The Jenny Craig program assigns each dieter a personal Jenny consultant who will customize their weight loss plan and meet with them during weekly one-on-one sessions to help guide them through the program's 3 stages - food, body and mind. To educate you on nutrition and portion control, the program initially provides frozen or shelf-stable prepackaged meals that are high in fiber and low in fat/cholesterol. You will supplement these meals with 2-3 servings of fresh fruits, vegetables, or non-fat dairy products bought at a local grocery store. Halfway from your goal weight, you will slowly transition to cooking your own meals (using Jenny recipes) until you have reached your goal weight and are only cooking your own food. Meanwhile, your Jenny consultant will help devise a workout program based on your current activity level with the ultimate goal eventually being 60 minutes of advanced physical activity a day (Pilates, running or weight training). Your Jenny consultant will also help you better understand how your existing relationship with food, life experiences and social environment have impacted your health and weight, and how you can build the necessary skills to change your previous mind-set and maintain the good habits that you have acquired during the program.
Created by biochemist Dr. Barry Sears, the Zone Diet controls dieters' food intake using a "food block" system, which assigns values to different foods. For example, 1 food block could equal 12 spears of asparagus or 1 ounce of chicken or 1/3 teaspoon of olive oil. Most women are able to consume 11 food blocks a day, while most men will be allowed 14. Eating in the right proportions is also essential on the Zone Diet. Each meal should be 40% carbs, 30% protein (low-fat), and 30% of healthy fat. When putting together your plate, 1/3 of it should be filled with a low-fat protein (3 oz for women or 4 oz for men), and the other 2/3 of it should be filled with low-GI carbs (ex. vegetables, lentils, beans, whole grains or fruit). You can then use a "dash" of heart-healthy monounsaturated fat (ex. olive oil, canola oil, macadamia nuts, and avocados) on top. Finally, the Zone requires keeping a food journal where you track what you ate and how you felt after 4 hours. If you aren't hungry and your mind is clear, your body is in The Zone.