No joke – over 50% of diet products simply don’t work. So what about Medifast? Here at DietSpotlight, we decided to conduct an in-depth review, closely examining the product’s side effects, ingredients, customer service quality and scientific studies. Plus we scrutinized hundreds of user comments, which are posted all over the internet. Lastly, we summarized all the facts and details to give you the bottom line.
What is Medifast?
To start off, Medifast is a weight-loss program that was founded by Dr. William Vitale. You are expected to eat specific food portions. Meals are delivered to your home on a regular basis. The menu consists of soups, entrees, bars, sides, shakes and high-protein foods. According to the official website, there are three primary plans available, which are the Achieve Weight Loss Plan, Thrive Healthy Living Plan and Medifast for Special Diets. Each day you can have four meals, one healthy snack and two lean and green meals. There are more than 70 different choices to select from. 
Medifast has been around since 1980 and everything can be purchased directly from the main website. There are customer testimonials posted on the website, as well as a 30-day money-back guarantee, but read on…
Steep Price – “Something to Consider?”
The first concern we had was with the price. “The actual cost of the Medifast weight-loss plan is $300 to $400 per month, which many people simply can’t afford. There is also the cost of shipping,” says our Research Editor.
One dieter stated, “They make it difficult to login or change your password, so I got a notice that I was billed $350 for a reshipment at midnight last night and immediately reached out to support to stop the order. They claim they cannot stop an order once it is placed which is nonsense as it won’t ship for days.” 
According to another customer, “I am so outraged and devastated. For two years I watched everything that went in my mouth and going back on Medifast for 2 weeks and spending $400, I gained 7lbs.”
To save money, some dieters go to Amazon.
One review said, “I save over $100 per month by ordering from PSG.” 
Consumer Complaints about Medifast – “Another Concern”
We found all sorts of user complaints across the web for Medifast. In fact, one dieter commented, “Horrible customer service and shoddy business. Stealing money is their only objective.”
Another user said, “This food is so awful that I have to hold my breath and chug it down. Each product I have tried is very gritty and tastes of cardboard with very little seasoning or flavor at all.”
Happy customers are out there, too.
“I have been following medifast program for 11weeks now and my results are pretty great,” claimed one dieter. 
Our research has revealed that if there is one particular aspect of a diet program or supplement that is very troublesome (a painful/difficult exercise routine, steep price, customer complaints) the probability of long-term success is low. Therefore, if Medifast is not acceptable to consumers, this could be a serious problem.
What About the Science?
Some clinical studies are mentioned on the Medifast website, but from what we gathered, these do not prove it will be effective for you. It really just depends on the individual and his or her weight-loss goals. The truth is, reducing your daily caloric intake may give you similar results and this doesn’t cost as much money. At DietSpotlight, we prefer to see solid science that supports the diet program we’re.Also: read our Leptigen Weight-Loss Kit review »
The Bottom Line – Does Medifast Work?
Now the moment you’ve been waiting for – our bottom line on Medifast. Well, we like the longevity as a diet program and some positive comments we saw about it online. However, we are concerned about the high cost. Also, we are leery because of all the customer complaints we found online. 
If you’d like to shed some serious pounds, we encourage you to go with a diet program or supplement that does not cost you a fortune, is backed by plenty of positive customer reviews and is easy to use anywhere.
Among the best products we’ve seen this year is one called Leptigen. This supplement contains four potent ingredients, which have been tested and shown to help accelerate metabolism, improve fat loss and curb appetite. We can’t find any discussion of harmful side effects and user comments around the web reveal people are seeing solid results.
The makers of Leptigen are so sure about their product they’re offering a Special Trial Offer, which is a positive sign.
Previous Medifast Review (Updated January 1, 1970):
What You Should Know about Medifast
Medifast is basically a diet plan, which consists of pre-planned meals, similar to Nutrisystem. There is a separate Medifast "5 in 1" plan to suit women, men and individuals afflicted with diabetes. The official Medifast website states that this diet program does not involve the process of counting calories or points. The meals involved with Medifast are stated to be low in fat and calories, but also nutritionally rich. A single month's supply of meals costs $275, regardless of whether it's for men or women. Consumers additionally have the option of designing a more specific menu of meals.
The official Medifast website claims that each meal is "portion controlled" and user's tend to see results in the first week. The individual meals are stated to "create a calorie deficit," hence enabling the body to burn off fat as energy. Medifast supposedly enhances lean muscle mass by offering just the right combination of carbohydrates and protein. When it comes right down to it, Slim Fast has a weight loss plan that focuses on curbing appetite and keep blood glucose level between meals. There doesn't appear to be any key active ingredients found in Medifast meals other than simple nutrients. The general cost for using the Medifast diet program is 10 dollars per day. Medifast meals incorporate a vast array of fruit drinks, bars, chili, soups, oatmeal, hot beverages, shakes, puddings and eggs. The official Medifast website lists no side effects in regards to their meal plans or products. Medifast meals are intended to be eaten every 2-3 hours, which is commonly six times each day. If all meals are not consumed, it's claimed that the weight loss process can be hindered or slowed down due to the user's body storing energy. When diet plans are combined with exercises like Piyo they, at times, aid in weight loss results.
List of Ingredients
Not really applicable.
Product Features of Medifast
Medifast is a diet plan consisting of pre-planned meals. This product comes in three forms; one suitable for women, one for men and one for individuals that suffer from diabetes. While Medifast does not appear to contain any specific key components, it is stated to offer a sufficient variety of protein, carbs and nutrients. This combination is claimed to assist users in reducing weight and acquiring lean muscle mass. Medifast aims to "create a calorie deficit," hence enabling the body to burn off fat as energy. The general meal plan costs $275 per month and users are directed to consume six meals throughout each day.
Advantages of Medifast
- Medifast can be conveniently ordered online through the official website.
- There are Medifast meal plans specifically geared toward women, men and diabetics.
- The Medifast diet program does not involve taking medications.
- The official Medifast website offers consumer success stories.
Disadvantages of Medifast
- Medifast may prove to be a bit pricey for some consumers considering it costs $275 per month.
- The Medifast eating program may be difficult for some individuals to keep up with since it involves eating six meals each day.
- Some dieters may find the Medifast plan somewhat restricting since they're only able to consume the Medifast meals.
- Medifast meals have to be eaten every 2-3 hours, which may not fit every dieter's schedule.
- Some individuals become "bored" with the meals and even find some unappetizing. (See reader comments.)
- Medifast does not appear to contain any specific active ingredients that curb hunger or promote fat reduction.
While some individuals may enjoy the idea of Medifast providing all daily meals, the plan itself might get a bit pricey over time considering it costs $275 per month. On the bright side, Medifast does not involve any diet drugs or pills. However, the idea of consuming six meals each day on a schedule may be somewhat difficult for working individuals, or for those with frequently eat out. It's prudent to examine all current diet pills and plans prior to purchasing one like Medifast. Especially since this program restricts the consumption of foods that are not purchased from Medifast.
Medifast Questions & Answers:
We picked apart hundreds of user comments about Medifast and placed them into this helpful FAQ.
What are the side effects of Medifast?
Medifast side effects reported by customers include upset stomach, nausea, headache and irregular bowel movement.
What are the ingredients in Medifast?
Medifast ingredients vary, based on the meal plan selected. You can choose from breakfast, lunch, dinner and snacks.
Does Medifast work?
There are studies on the Medifast website highlighting the benefits, but not that it helps with weight-loss. What we found was the research related to the Medifast 5 & 1 Plan, not the other programs.
How much does Medifast cost?
The cost of Medifast starts at $149 for the two-week trial and the 30-day plan is $299.
How should I follow Medifast?
You should follow Medifast based on the plan selected. The majority of the programs run for 30 days.
Can I take Medifast if I have a health condition?
Women who are pregnant or nursing, those with health conditions, anyone taking prescription medications or under 18 years of age should contact a healthcare professional prior to starting a diet plan of any kind, including Medifast.
What do users like about Medifast?
Some users liked the custom meal plans on Medifast.
What do users NOT like about Medifast?
According to customer comments, they didn’t like the high cost of Medifast.
How do I contact the Medifast customer service department?
You can contact the Medifast customer service department by calling a representative at 1-800-209-0878, using the Live Chat feature or the feedback form on the official website or sending letters to your local weight-loss center or the corporate headquarters at Medifast 11445 Cronhill Sr. Suite 200 Owings Mills, MD 21117.
Can I contact Medifast through social media?
How many meals will I eat on Medifast?
You will eat four portion controlled meals on Medifast, as well as two green and lean meals and a healthy snack.
How many calories will I eat daily on Medifast?
Depending on your plan, you will eat between 1,000 and 1,300 calories on Medifast.
Is Medifast plans covered by insurance?
Plans like Medifast may not be covered by insurance. Contact your provider for additional details regarding coverage.
Does Medifast come with a guarantee?
Medifast comes with a 30-day guarantee.
Do you know of any special deals or discounts on Medifast?
There are deals and discounts on Medifast. If you sign up for select plans, you will receive a percentage off the purchase price. However, our readers have bee so excited over the last several months taking advantage of Leptigen’s Special Trial Offer. Click above to learn more.
Medifast Side Effects:
Dietary soy protein had reduced fat mass body weight in obese humans, as well as decreasing plasma lipids. There is an array of mechanisms in which soy protein improves insulin resistance as well as reducing body fat and blood lipids. Intake of soy protein has the ability to trigger an allergic reaction, (like most protein) and should be avoided in individuals who are at higher risk of food allergies. Long-term trials including many obese participants are required to confirm whether soy protein delivers long-term safety as well as benefits in obese humans. 
Fructose inside high fructose corn syrup, as well as sugar, creates sweetness in beverages. This sweetness could be the cause of obesity in relation to soft drink consumption. Fructose intake has been linked to the metabolic syndrome as well as irregular lipid patterns. This data indicates that there needs to be a concern for amount of fructose intake, which has risen over the past 200 years and now is responsible for 10% of energy consumption of some individuals. 
Prolibra (specialized whey fraction) participants had lost substantially more body fat in comparison to control participants in both the completer (2.81 vs. 1.62 kg P = 0.03) as well as the responder (3.63 vs. 2.11 kg, P = 0.01) groups. Participants taking Prolibra had lost substantially less lean muscle mass within the responder group (1.07 vs. 2.41 kg, P = 0.02). Fat to lean loss ratio had been much larger (kg fat lost/kg lean lost) for Prolibra participants for both completer (3.75 vs. 1.05) as well as responder (3.39 vs. 0.88) subject groups. In a 500 calorie reduced diet, participants in both the control and treatment groups had experienced significant weight-loss. Participants administered Prolibra had lost substantially more body fat and displayed a greater preservation of lean muscle in comparison with those ingesting the control drink. Because the participants ingesting Prolibra had lost 6.1% of their body fat, and because participants had experienced a 5% decrease of body fat which has been shown to decrease risks of obesity and related diseases, the data has practical significance.
Non Fat Dry Milk
Mice that were fed non fat dry milk had experienced less body fat and had decreased mRNA markers of adipose inflammation (p < 0.05) than control. In addition, mice fed non fat dry milk had lipid mediator profiles that were distinct from control as well as HighCa mice. Non fat dry milk mice had displayed increased plasma monoacylglycerols (6 – 46% increase from control mice), including reduced fatty acid diols and 2-arachidonoylglycerol. The alterations in the specific plasma lipid mediator profiles had reflected on the inflammatory and metabolic phenotypes as seen in non fat dry milk feeding. 
- 1. Role of Dietary Soy Protein in Obesity (2007). International Journal of Medicals Sciences. November 14, 2016.
- 2. Fructose: should we worry? (2008). International Journal of Obesity. November 14, 2016.
- 3. A whey-protein supplement increases fat loss and spares lean muscle in obese subjects: a randomized human clinical study (2007). Nutrition & Metabolism. November 14, 2016.
- 4. A diet containing a nonfat dry milk matrix significantly alters systemic oxylipins and the endocannabinoid 2-arachidonoylglycerol (2-AG) in diet-induced obese mice (2014). Nutrition & Metabolism. November 14, 2016.
Medifast is a weight-loss program based on purchasing prepared meals and snacks. This is a clincally proven means of reducing caloric intake for weight-loss, if the dieter sticks with it. The three plans available are: Medifast Achieve Weight Loss Plan, Thrive Healthy Living Plan and Medifast for Special Diets.
Medifast Ingredients and Supplement Facts
Serving Per Container: N/A
|Amount per Serving||% DV|
|Meal Replacement Shakes||*||*|
|- Soy Protein Isolate||*||*|
|- Whey Protein Concentrate||*||*|
|Meal Replacement Bars||*||*|
|- Soy Protein Isolate||*||*|
|- Soluble Corn Fiber||*||*|
|- Whey Protein Concentrate||*||*|
|- Dried Egg Whites||*||*|
|- Yogurt Powder||*||*|
Other Ingredients: None
We took the time to really dig deep into the Medifast ingredients so we could give you all of the important facts.
Soy protein is derived from soybeans. It is an alternative to animal-based proteins, and is commonly found in supplement powders, shakes and bars. Furthermore, it’s basically free of saturated fat and cholesterol. It’s also low in calories and provides phytoestrogens.
What is it Supposed to Do?
Soy protein is often used in meal-replacement products, fitness shakes and diet snacks to aid with weight-loss. It provides protein and amino acids, which help promote muscle growth. This ingredient may also reduce hunger and help with heart health.
According to the University of Maryland Medical Center, “Studies suggest that soy protein may reduce the risk of heart disease by lowering levels of LDL (bad) cholesterol. For example, in a clinical study of nearly 5,000 men and women living in Japan, those who ate the most soy had the lowest cholesterol levels.”
Whey protein is basically a byproduct of cheese manufacturing. It is often used in supplement powders and shakes. This protein is available in forms such as concentrate, isolate, and hydrolysate. It provides amino acids, which are the building blocks of protein.
What is it Supposed to Do?
Often whey protein is used in fitness shakes and diet products to help with muscle building, fat reduction, increased energy levels and reducing appetite. When consumed in place of foods high in fat and sugar, this ingredient may aid with weight reduction.
“Whey protein supplements may not be your favorite weight-loss aid, but they can help you lose fat instead of muscle, according to a 2008 study published in Nutrition Journal. This study found that a whey protein meal-replacement shake helped a group of overweight and obese individuals following a reduced-calorie diet lose more body fat than muscle.”
Nonfat Dry Milk
Nonfat dry milk is a dairy product that is created from real milk. The water and cream are essentially removed. It still provides vitamins, minerals, calcium and protein. However, it does not have the same level of fat and cholesterol you find in regular milk.
What is it Supposed to Do?
Nonfat dry milk is commonly used in recipes, protein shakes, diet products and various processed foods. It is often used in place of regular milk when required.
NCBI.gov reported that, “Mice fed nonfat dry milk had less body fat and reduced mRNA markers of adipose inflammation (p < 0.05) than CONTROL mice despite greater cumulative energy intake.”
One that’s caught our attention is one called Leptigen. There’s solid science supporting the clinicially-tested ingredients. Want to learn more? Click above.