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Use of the medication Lithium (your physician may wish to order
laboratory blood tests to determine lithium levels while on the
program)
A history of seizures (your physician may wish to order laboratory
blood tests to determine seizure medication levels)
History of Peptic Ulcer disease (not active)
Anticoagulant medication such as Coumadin or Warfarin, require consistent intake of vitamin K to get the most benefit from the medication. Since Vitamin K in foods may affect the action of anticoagulants, you should avoid drastic changes in dietary habits or in your consumption of foods high in vitamin K. All Medifast products contain Vitamin K in the vitamin/mineral premix. You can use the Medifast program with this medication since your daily intake of vitamin K will be similar each day. Your physician should be aware that Medifast products are fortified with vitamin K. It is important to work with your physician to have laboratory blood work done to determine a therapeutic level of the Coumadin or Warfarin medication.
Over the age of 70 years old, a higher calorie and/or protein level
may be necessary, so we do not recommend the standard Medifast 5 & 1
Plan. Some people over the age of 70 have been successful with
weight loss using Medifast products in conjunction with a 1,200
calorie per day diet. Please refer to our Senior Meal Plan for
helpful information.
Adolescent use – beyond puberty and under the age of 18, any weight loss program (such as Medifast) should be used only as directed by your physician.

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Medifast Weight Loss Tips Directory Information About Medifast Weight Loss Contraindications and Side Effects |
Starting Medifast Weight Lossa
Medical Monitoring Exercising on Medifast Weight Loss |

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