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.
The South Beach Diet was created by Dr. Arthur Agatston, a preventative cardiologist living in Miami Beach, FL and it has 3 phases. The 1st phase of the plan is the most restrictive and lasts 2 weeks. It is designed to eliminate cravings for refined starch and sugar, as well as jumpstart weight loss. During this phase, you are prohibited from all sugars, processed carbohydrates, fruits, alcohol and certain higher-glycemic vegetables. The 2nd phase will last until you reach your goal weight. During this time, you will reintroduce "good" carbs, such as whole grain bread and fruit, and are allowed to have a glass of white or red wine with dinner. The 3rd phase lasts indefinitely and is designed to help you continue using the principles you've learned in the previous phases to maintain a healthy weight for life.