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There are a number of Medifast products - 90 calorie liquids. Higher calorie liquids. Soups. Some other products.
Generally Medifast recommends that you do either 4 shakes a day and one low calorie meal, or 5 shakes a day and no meals. If you are diabetic you shouldn't do a pure liquid diet.
BTW, as others told you, DO NOT do Medifast without medical supervision. It is a very low calorie diet (the 90 calories add up to 450 a day). A doctor needs to ensure that you are in good health, and keep an eye on your blood work and heart condition.
I did Medifast for 6 months and lost 82 pounds. It worked for me, but it most certainly is not for everybody.