Our Thyroid Medication, Soy, and Your Medifast Plan (PDF) handout provides information on how to successfully use Medifast for individuals taking thyroid medication. We recommend discussing your medical conditions and weight loss plans with your health care provider before starting the Medifast Program.
If your doctor has prescribed thyroid medications like levothyroxine, Synthroid® or Levoxyl®, you should understand that eating soy may slow down your body's absorption of these drugs. You should wait one to three hours before or after taking your thyroid medication before eating any Medifast Meal containing soy protein—or choose a soy protein-free meal instead. Your healthcare provider may want to monitor your thyroid hormone levels during your weight-loss program.
For information on soy-free and soy protein-free products, please refer to our Allergen/Dietary Information (PDF).
In some cases, surgery alone may not be enough for maintaining a healthy weight over the long term, and you may benefit from a nutritional meal plan to control calories. Regardless of the procedure you've undergone, Medifast can help you achieve and maintain your weight-loss goals, safely and effectively.
Please refer to our Bariatric Surgery and Medifast Information Sheet (PDF) for more information. We recommend you discuss your medical conditions and weight-loss plans with your health care provider before starting the Medifast Program. Your health care provider may want to monitor your labs and medications, or can help determine a calorie level that's appropriate for you.
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Medifast makes no claim that these results are representative of all participants on the Medifast Program. Medifast recommends you consult with a physician before starting a weight-loss program. Medifast is the brand recommended by more than 20,000 doctors since its founding.
Shikany, J. M., A. S. Thomas, T. M. Beasley, C. E. Lewis and D. B. Allison (2013). "Randomized controlled trial of the Medifast 5 & 1 Plan for weight loss." Int J Obes (Lond) 37(12): 1571-1578. View Study