NutriSystem started off with most of its clients being women. Now, they offer a men's plan and a senior adult plan for both men and women. Their website also states that they have plans for vegetarian dieters and those suffering from Type II diabetes.

The Nutrisystem Diet uses the glycemic index to help people lose weight. The glycemic index is a numerical system based on the fact that certain foods effect blood sugar in different ways. Foods with a high glycemic index cause an insulin spike in the blood where insulin floods the blood stream. This causes hunger to return more quickly after this type of food is eaten. Low glycemic index foods provide more stable insulin production, are burned more slowly, and provide energy for a longer period of time during the day. Low glycemic foods do not spike insulin and generally are more satisfying.

This is a meal delivery plan. Food provided by NutriSystem is shipped to your home every four weeks. The process used to package the foods means that they do not need to be refrigerated. Easy to follow instructions tell you how to prepare each dish.

Each dish consists of nutrient-packed, low glycemic index foods. The good carbohydrates in the meals cause weight loss very quickly. In fact, according to participants, the weight just melts off.

The plan recommends that participants add low fat dairy, salads, and fruit to their prepackage meals. Again the main focus of the diet is cut out bad carbs from your everyday diet. High glycemic foods spike the blood sugar and cause diseases like diabetes and heart disease. Processed carbohydrates raise blood sugar while low glycemic carbs help lower and stabilize blood sugar.

The Nutrisystem Diet does not require exercise and its designed to work without it. However, if you do exercise while eating Nutrisystem Meals undoubtedly you'll lose weight even faster!

One criticism of the Nutrisystem Diet is that it is too expensive. However, most people do not realize just how much they spend on food. The Nutrisystem Diet completely replaces all of your meals and the costs associated therewith. So if you typically spend 200-400 on food per month (and be honest those $2 muffins and $3 coffees count) you'll spend the same or less with Nutrisystem. And you'll be losing weight just by eating!! Nutrisystem does not require record keeping. No calorie counting. No diet diaries. You just select your meals, add some healthy sides and eat!