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The NutriSystem diet entails eating mainly prepackaged NutriSystem meals until you reach your desired weight. The premise of the diet is that eating mostly foods with a low glycemic index will help you lose weight.
Jenny Craig touts itself as a Clinically Proven Weight Loss Program. The program focuses on one-on-one support, whether it be in person at one of their Jenny Craig Centres, or Jenny Craig at home, which offers weekly phone consultations.
Also known as the primal, caveman or hunter-gatherer diet, the Paleo diet is an eating plan based on the foods available for humans to eat during the Paleolithic period. The Paleo diet consists of lean protein, fruits and vegetables in season, and healthy fats such as unsalted nuts and seeds, avocado, and olive oil.
The Dukan Diet was developed by a French medical doctor, Dr. Pierre Dukan. With his original emphasis on neurology, he switched his emphasis to clinical nutrition in an effort to help solve the obesity epidemic.
The Atikins Diet was created in 1963 by Dr. Atkins to help his overweight and obese patients find a way to lose weight and regain their health. The basis of the plan is that participants restrict the amount of refined or simple carbohydrates and concentrate on eating high-fat, high-protein foods with a few complex carbohydrates -- mostly vegetables.
A naturopathic doctor named Peter D’Adamo created a diet aimed at specifically targeting health issues and digestion issues for your specific blood type. The diet is based on intensive research about how each blood type developed and how the origins of each caused specific antibodies to develop, making digestion difficult for certain foods and food groups.
The core part of the Medifast diet is the 5 & 1 plan, which you follow until you reach your desired weight loss. You eat six times per day: five Medifast prepackaged meal replacements and one “lean and green” meal. Medifast provides more than 70 meal replacements to choose from, such as soups, shakes and bars.