Medifast vs. Wonderslim - Our In-depth Comparison for 2021

medifast logo image


Medifast offers a combination of shakes, meals and snacks to help customers lose weight in a safe, sustainable way. Its diet, designed by doctors, encourages healthier eating habits, kickstarting their customers’ lifestyle change.

  • Shipping Cost: $0*
  • Average Price Per Meal: $2.36
  • Delivery Area: 50 States

* for deliveries of $250+

Wonder Slim icon


Wonderslim, whose meals are specially designed by dieticians, help people achieve their ideal weight while making sure they get all their important nutrients. They offer their customers tasty snacks, meals and meal replacement shakes.

  • Shipping Cost: $0*
  • Average Price Per Meal: $1.73
  • Delivery Area: 50 States

*  free for $69+ dollar orders

Meal Options



Plan & Pricing


  • GO! Plan $2.21

    5 servings per day; 30-day kit price: $341

  • Achieve Select Plan $2.56

    4 servings per day; 30-day kit price: $323

  • Achieve Complete Plan $2.71

    4 servings per day; 30-day kit price: $399

  • Thrive Plan $3.47

    3 servings per day; 30-day kit price: $313


  • Essentials $1.83

    4 servings per day; 2, 4, 8 and 12 week plans available; 4 week plan price: $205

  • Classic Plan $1.74

    5 servings per day; 2, 4, 8 and 12 week plans available; 4 week plan price: $243

  • Complete Plan $1.63

    7 servings per day; 2, 4, 8 and 12 week plans available; 4 week plan price: $319




Popular Meals

image of Rice & Chicken Soup Medifast


  • Wild Rice & Chicken Flavored Soup
  • Chicken Flavored Noodle Soup
  • Ziti Marinara
  • Original Pancakes
image of Vegetarian Sloppy Joe by Wonderslim


  • Vegetarian Sloppy Joe
  • Cheese Steak Macaroni
  • Spicy Cheese ‘n Pasta
  • Chili with Beans
Steaming food tray with lid

Our Comparison

Meal Plans

Both of the services provide plenty of snacks, bars and shakes, while they leave cooking 1-2 meals a day to the customer with guidelines for acceptable ingredients. They have plans suitable for nursing mothers, diabetics and vegetarians and people requiring kosher food.

There are many options for allergy sufferers, with Medifast offering a specific gluten-free meal plan, while Wonderslim provides gluten-free options. Both have vegetarian meals, although Wonderslim offers a vegan option too. 

Medifast offers three basic plans to their customers: GO!, Achieve (there are two different varieties within this plan), and Thrive. While GO! and Achieve are designed for weight-loss, the Thrive plan is used to maintain a healthy weight once it has been reached. While the Achieve Plan leaves the preparation of two meals up to the customer, the GO! plan only requires customers to cook one of their own meals, with provided guidelines and recipes.

Wonderslim offers three basic plans: Essentials, Classic, and Complete. All three come in varieties specially designed for men, women, diabetics and nursing mothers. These include meal replacement shakes, meals, and delivery of ingredients with which customers can prepare dinner themselves.

Check our complete list of best rated meal deliveries for diabetics in 2021.

The Quality of the Ingredients

Wonderslim promises its customers food made in FDA-inspected facilities in the USA. Many of their products are free from aspartame, and clear labelling allows customers to choose between products containing aspartame, and aspartame-free ones. Medifast, on the other hand, uses only natural colours. Although both services use healthy, nutritious ingredients in making their products, our choice here is Wonderslim. If the FDA approves, so do we!

Nutritional Value

With both Wonderslim and Medifast, customers can eat 6 times a day, which means eating every 2-3 hours. Eating small portions frequently helps to keep hunger at bay. The food is specially designed to be low in calories, but high in nutritional content such as protein and fibre. Wonderslim gives customers supplements to take together with their diet, making sure that no vitamin or mineral is missed.

Recipe Variety

As mentioned above, Wonderslim and Medifast both enable customers to cook 1-2 meals a day themselves. Therefore, both services offer more shakes, snacks and bars than they do ready-made meals. However, Wonderslim provides a far greater variety of products, with 150 options by comparison with Medifast’s 65.

If you’re more interested in top rated services for ready-made meals, check our guide.

Steaming food tray with lid

The Packaging

image of medifast package

Wonderslim and Medifast deliver to all 50 States. Subscription to auto-delivery with Medifast guarantees free shipping on orders of $250+. Medifast has special websites through which it is possible to order to Canada and Mexico.

Wonderslim Box of Food

With Wonderslim free shipping  is available with orders as small as $70. They delivers internationally, to countries such as New Zealand, Japan and Ireland. They also take special care to make sure the food doesn’t get damaged by warm weather.

Customer Support & Service


  • Switching Plans – Medifast allows customers to switch plans as they choose.

  • Cancellation – Orders can be cancelled up to 6pm EST on the day before shipping. After that, it’s not possible. 

  • Refunds – Customers can receive a full refund on products they return within 30 days of delivery. If you refuse a shipment, $15 is deducted from your refund.

  • Gifts – Customers receive a free dining out guide, food journal and blender bottle with the GO! Plan. With the Achieve Plan, you get some extra snacks and a cookbook.

  • Free Trial – Medifast do not offer a free trial.

  • Customizable – Can be customized for special dietary requirements, especially if you are ordering a la carte.

Medifast offers the option of purchasing once-off or subscribing to auto-delivery. Auto-delivery comes with the advantage of discounts. Customers can also order diet plans, or order from an a la carte menu, and switch between them whenever they want.


  • Switching Plans – Wonderslim allow customers to switch plans.

  • Cancellation – If you subscribe, cancelling or skipping a delivery is possible, though you have to check it with the support team because a delivery can’t be cancelled if it has already been processed. 

  • Refunds – Wonderslim allow customers to exchange products and offer a 150% money-back guarantee to customers who aren’t fully satisfied within 60 days of purchase.

  • Gifts – As well as their friend referral program, Wonderslim give coupons and a rewards program where customers get a 10% discount on online orders.

  • Free Trial – Although Wonderslim don’t offer a free trial, they give customers lots of coupons and discounts. 

  • Customizable – All of Wonderslim’s plans can be customized.

Wonderslim also provides both plans and an a la carte menu. Similarly to Medifast, customers can either subscribe and save money on orders, or opt for once-off purchases. 

Our Verdict

Wonder Slim icon

Medifast and Wonderslim provide safe, effective ways to lose weight, offering a combination of meals, shakes and snacks, while allowing customers to cook some meals of their own in line with their diet program. That said, Wonderslim give their customers significantly more options than Medifast, also providing supplements to ensure people get all the nutrients they need. Additionally, they are slightly more affordable. Hence, our choice between these two is Wonderslim.