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 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.
Nutrisystem offers gender-specific plans for adults (Core), diabetics (Nutrisystem D), seniors (Silver) and vegetarians (Vegetarian). You will purchase food shipments in 28-day supplies and can choose from pre-selected menus or pick out specific meals you'd like from more than 130 choices. The prepackaged meals are low in sodium, saturated and trans-fats, and they promote protein and low-GI carbohydrates. They are frozen or shelf-stable and will provide about 60% of your daily calorie intake. The other 40% will come from Nutrisystem-approved foods (i.e. fruits, veggies, protein and dairy) from your local grocery store. Once you've reached your goal weight, you can chat with a Nutrisystem counselor online or by phone if you want help/tips for transitioning away from prepackaged meals and back into the kitchen.