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Optifast Review - 12 Things You Need to Know

Optifast is a weight loss program that tries to include all aspects of a healthy lifestyle, like diet supplements, meal replacements, medical clinics, and more. The plan promises weight loss and a decrease in waist circumference. However, ingredients like sucralose and canola oil haven’t been shown to do have any of those benefits.

Our research team looked into the program’s scientific claims, “patient journeys,” and medical monitoring. In the end, our team compared Optifast’s published success stories and weight-loss contests to the customer reviews to see if this is the plan for you.

Optifast can be purchased through their Official Site.

Optifast Readers: Noom is offering our readers a free trial, for a limited time. Click here for this special offer!

What is Optifast?

Optifast is a company brand created by Nestle Health Sciences that provides weight loss programs for people who have a high BMI (30 or greater) are obese or overweight. The Optifast weight management system requires the use of Optifast shakes and meal replacement foods such as bars and soups. Their programs claim to be for those who are overweight, people of most ages, teens, and people who plan to undergo weight loss treatments.

The programs are also comprehensive, which means that doctors, psychologists, and other health professionals are involved in the weight reduction journey of each person enrolled in the Optifast system. An Optifast meal plan consists of a liquid diet including Optifast shakes.

Typically, you’ll follow the diet for at least four weeks. The timeframe makes it easy for almost anyone to follow. Weight loss from this eating plan results from eating a very low-calorie diet (VLCD). Optifast is a VLCD option for those seeking immediate help with their body weight.


Optifast Competitors

Ideal Protein
HMR Program
Other similar products: UltraInflamX, Serious Mass, Isagenix

What Does Optifast Do?

The Optifast weight management system may help people lose weight in a short period. Programs geared toward different age ranges are available as well as programs created specifically for people undergoing some weight loss treatments. Dieters on any one of the Optifast programs are required to consume primarily Optifast products during the main phase of the diet, which may last over six weeks.

The three Optifast phases include:

  • Active weight loss
  • Transition
  • Maintenance

Active Weight Loss

The patient visits the clinic where the doctor run tests and prepares a custom program. During the Active Weight Loss phase, you’ll follow an Optifast full meal replacement diet.

Active 2-In this phase you will consume:

  • 3 OPTIFAST VLCD products
  • 2 cups of low starch vegetables
  • One teaspoon of vegetable oil
  • providing less than 800 calories per day

This phase lasts about 12 weeks. However, you’ll receive weekly monitoring.

An additional benefit is the weekly group meeting.


The second phase (also known as Active 1 Phase) is the transition phase. It lasts about six weeks and slowly begins adding in regular foods. You’ll continue to attend group sessions.

In this phase you will consume:

  • 1 Optifast VLCD Product
  • 2 low-calorie meals (approximately 400 calories each)
  • at least 2 cups of low-starch vegetables
  • 2 serves of fruit
  • 1 serve of dairy
  • providing 1000-1200 calories per day

Long-Term Weight Management

The Maintenance Level all Optifast VLCD products are eliminated, and the focus is on maintaining your weight loss.

Dietary intake consists of:

  • 3 low-calorie meals (approximately 400 calories each)
  • 2 serves of fruit
  • 1 serve of dairy
  • plus low-starch vegetables

The dieter exercises and practices good eating habits learned throughout the program. Dieters eat regular food and Optifast meal replacement meals and a benefit is ongoing support from Optifast.

optifast ingredients


Optifast Ingredients

Optifast offers several different products. However, the Optifast Method relies on meal replacement shakes more than other pre-packaged foods. Some Optifast ingredients include:

  • Milk Protein Concentrate
  • Soy Protein Isolate
  • Maltodextrin
  • Vitamin
  • Minerals

Optifast Benefits

Some concerns regarding the Optifast programs and products have surfaced from time to time. However, there are some key benefits to using Optifast diet plans including:

  • Weight loss
  • Nutritional support
  • Easy prepared meals
  • Maintenance support for long-term results

Optifast diet plans are some of the only comprehensive diet plans that provide medical support, nutritional counseling, and meals. Other weight management systems may provide medical and nutritional counseling, but they won’t provide the actual food that the dieter needs to eat.

Optifast benefits


Optifast Results

Optifast results occur when the dieter lost weight and improved overall health and wellness. The Optifast programs are primarily for health purposes and not just physical shape or numerical weight. A person who has gone through the program and has signs of improved health is considered a success.

Side Effects

Optifast Side Effects

The Optifast diet plans are may be more supportive in many ways than other diet plans. By checking in with their physician, psychologist, and dietitian frequently, Optifast dieters are more likely to stay on track and avoid any risks associated with weight loss. However, the risks that may occur whenever a person starts a diet like this include:

  • Nausea
  • Upset stomach
  • Irregular bowel movements
The Optifast Diet

What is the Optifast Diet?

The Optifast Diet is boasted as “the serious solution for weight-loss” and claims to be suitable for both adults and teenagers with a body mass index (BMI) of 30 or greater. Basically, this is a medically supervised program that’s intended to help with weight reduction and overall health. It typically lasts for 26 weeks and may be partnered with a weight-loss surgical procedure. This program involves:

  • Meal Replacement Diet
  • Medical Supervision
  • Lifestyle Education
  • Counseling
  • Ongoing Personalized Support

optifast directions


Optifast Directions

Since Optifast diet plans aren’t the same for everyone, each person will have different directions that they need to follow. They’ll need to follow the guidelines established by their physicians and dietitians over the course of the main dieting phases.

Most dieters consume around five shakes per day and maybe even a few snacks, but the caloric allowance will depend on the weight and health of the user.


What is the Optifast Cost?

The cost of the entire Optifast diet program may run upwards of a few thousand dollars. The cost includes visits to Optifast clinics, applicable tests, therapy sessions, and nutritional counseling. Also, meal replacement products vary in cost as well.

For example, an Optifast shake can cost between $21 and $80. Considering the dieter is only allowed to eat or drink Optifast products during the first phase, this may get expensive fast. There are also additional costs associated with the Optifast. There are reports of a monthly fee, a starting fee, and service fees.

Moreover, the price varies depending on the goals of the person. However, some consider Optifast products not budget-friendly. You can contact the company directly for specifics relating to price.

On their website, you can find a clinic near you by entering your zipcode. From there, you may be able to learn more about potential costs.

Does Optifast Work?

Optifast uses a non-traditional approach to weight loss. While great for some; it’s a challenge for others. The Optifast diet restricts calories to a certain degree. While this may cause weight loss, some find it difficult to follow such a very low-calorie diet.

Assuming a person is ready to start the program and finds a clinic nearby, the diet is still very intensive and will require a lot of time off of work or school for medical appointments.  This may also be a deterrent to success and may cause people to quit halfway through. Some of the ingredients used in Optifast products are also questionable.

But, they may not prevent the dieter from losing weight, which is the main purpose of the program. Perhaps the best way to get a better idea of whether Optifast works is to take a look at some Optifast user reviews.

The Optiwin Study

The OPTIWIN study is a 52-week open-label, randomized, controlled clinical trial that assessed the safety and efficacy of the Optifast weight-management program.

In the OPTIWIN study, the Optifast group was comprised of 135 participants who followed a total meal replacement plan for 16 weeks. The meals were made up of 40% carbohydrates, 40% protein, and 20% fat. Traditional foods were introduced gradually after 16 weeks.

The food-based group was comprised of 137 participants who followed a reduced energy diet that adhered to the Diabetes Prevention Program guidelines.
Both groups exercised vigorously for 150-180 minutes each week. They also attended behavioral counseling sessions.

The Optifast group lost twice as much weight as the food-based group. The mean weight loss for the Optifast group was -12.4% compared to -6.0% for the food-based group. Optifast participants saw greater reductions in fat mass(30%-64% vs. 12%-42%) and waist circumference(p=0.011 vs. p=0.0011) as well.

What Users Are Saying

“I lost over 100lbs on optifast and it’s been 14 months since I began my journey, it’s honestly a fantastic life changing product. And I’m not paid to say that!”

“Optifast diets over longer periods give people gallstones. I’ve dealt a lot with this subject after the diet. Been to the ER for stones before.”

“Not good for diabetics. Too much sugar.”

Bottom Line

The Bottom Line on Optifast

Optifast is one of the few medically-supervised weight loss programs shown to work. Aside from customer reviews, there are studies that show its effectiveness. Once you dial in your diet, exercise and supplementation, there’s a chance you’ll lose weight.

Weight management incorporates diet, supplementation, and exercise. When it comes to support system and weight-loss apps to fit your lifestyle changes.

Among the best weight-loss programs we’ve seen is called Noom. Packed inside is a plethora of support to help you reach your goals and keep the weight off. The unique resources include expert articles, human coaching, personalized support and more. We’ve never come across a clinically proven weight-loss app, so we had to pass this one along to you.

Also, the team supporting Noom is offering a free trial as a sign of confidence in their program.

Learn More About Noom »
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What is the Optifast diet program?

Optifast is a very-low-calorie diet supplying no more than 800 calories a day.

What are the side effects of Optifast?

Optifast side effects may include:

  • Irritability
  • Bad breath
  • Fatigue
  • Headache
  • Hair loss

These side effects are as listed by Optifast.

Does Optifast work?

Many people have had success with Optifast. However, there are no studies available that prove that you will lose weight using this program.

How much weight can you lose on Optifast?

Because Optifast is a very-low-calorie diet that’s medically-supervised, rapid weight loss is likely. Weight loss of up to 5 pounds a week has been recorded.

How much does it cost to do Optifast?

The cost of a bottle of Optifast varies, considering this is weight-management program. Some users reported paying $100-150 a week, while others found the cumulative cost of he program, extra food, and more cost around $3500 for four months.

Where can I buy Optifast?

Optifast can be purchased using their Official Site.

Can you drink coffee on Optifast?

Yes, both coffee and tea are allowed on Optifast. You should only consume 3-4 cups of tea and coffee per day, and remember to steer clear of milk, cream, and sugar. You also cannot drink alcohol while on the Optifast program.

The program does suggest you drink 2 liters, or 10 large cups, of water every day.

Can you eat eggs on Optifast?

No, eggs are not part of the Optifast diet. You’ll eat mostly vegetables and salad partnered with Optifast shakes.

Do you need a prescription for Optifast?

Optifast doesn’t require a prescription since it is classified as a “food for special medical purposes.” You will need to see a special clinic, where a medical provider will assess whether or not the program is right for you.

Is Optifast covered by insurance?

This depends on the insurance company, level of coverage, and state. Contact your provider prior to beginning the program to find out what they cover.

How many Optifast shakes a day?

You need to drink four Optifast shakes a day. In some cases, you’ll be required to drink more than four, but four is the minimum.

Is Optifast right for me?

Optifast is best for patients with a BMI of over 30. It is recommended only as part of a comprehensive treatment program.

What can you eat with Optifast?

There is actually quite a variety of allowed vegetables and food that you can eat when in on the Optifast program. Some of the more notable vegetables that are allowed include green beans, alfalfa sprouts, eggplant, bean sprouts, cucumbers, bok choy, celery, cauliflower, carrots, capsicum, brussel sprouts, and cabbage.

Can diabetics have Optifast?

According to the official website, most type 1 and 2 diabetics that are overweight or obese are eligible for the Optifast program. It can also adhere to the guidelines for gastric bypass surgery prepration.

Can you exercise on Optifast?

You can exercise up to 30 minutes a day while on a very-low calorie diet like Optifast.

What is the difference between Optifast and Optislim?

Optifast is a medical weight-loss program, while Optislim is a line of Australian weight-loss food.

41 Optifast Reviews

  • Expensive and did not work at all
    Marybeth (Verified Purchase)

    I lost about 40 lbs from May 2009 to Feb 2010 on “modified Optifast”. Problem is, I gained back 20 of the 40 lbs I lost within 2 months, and really have been eating fairly sensibly. I just couldn’t stand the lack of variety with the diet, and the soups are very difficult to get mixed properly without a bunch of glop at the bottom.

  • Loved the product it works well
    Kathy (Verified Purchase)

    I’ve been on the Optifast diet for 4 weeks and have lost 15 lbs and think its a lot more. My clothes are so loose. I love it! Jackie, the first 2 weeks were the hardest! Stick with it honey.

  • Looking for nearest location

    Where is an Optifast Clinic in Austin/San Antonia, TX area

    • Carol

      Austin Regional Clinic has one

  • Best program I have ever done
    faysha (Verified Purchase)

    I have lost 170lbs in a year. I did the Optifast program along with excercise. Like any other diet you have to stick with it. It does work. Best program I have ever done.

    • Jackie

      Dearest Faysha:
      i read your comment on how you lost 170lbs while on the optifast diet, way to go! I have been on the optifast meal replacements for about 2 weeks now and it is the hardest thing i have done up to date. I also need to lose 173 lbs and so far i have lost 20lbs in 2 weeks. My question to you is, about how many pounds did you average to lose per week and what type of exercise did you do and are doing?

  • I LOVE Optifast
    Pam (Verified Purchase)

    I LOVE Optifast. It is an amazing product. I love the Vanilla Powder Shakes. I blend it together with water, ice, powder and a sprinkle of Starbucks instant coffee. I have been on Optifast for six months. I have lost 60 pounds. I drink two shakes a day and a Lean Cuisine for dinner. In the beginning, I did three shakes and two cups of veggies. After three-four weeks, I switched to the shakes a day. I could do this the rest of my life.

    • Anonymous

      pam i have a specific question can u email me at :kimorea@gmaildotcom . please

  • Connie

    Have been on Optifast for 3 weeks have only lost 5 pounds. Last week I gained 1 pound. What the hell is going on? I have followed the program with 4 products and 1 meal a day. I am on quite a bit of meds for A fib and Hypertension. Could it be that I have very painful arthritis and cannot do much activity? I am ready to quit. It is sooo expensive not to have lost any more than 5 pounds.Help!

    • Ken

      If you’re on the program it is a total meal replacement. It should be 6 products a day and lots of water. It’s most likely the “one meal a day” that’s likely high in calories and proportion. For the first 17 weeks it should be 100% product as your diet.

    • Cindy

      I do have fibromyalgia problems at one time I gained 40 pounds in 4 months and years later they tried me another medication I gained 30 pounds in 3 months I had to stop at medication being so heavy was worse on my health than the fibromyalgia pain alone

  • Arlene

    I pay 300 for eaach 2 week supply of meals.

  • I have not felt this great in a long time.
    Susan (Verified Purchase)

    I have been on the program 70 days, lost 35 pounds and have not felt this great in a long time. The program is not cheap by any means but I have multiple medical issues, needed to lose a lot of weight, They follow my progress at least weekly and are availabe to help me if I have a problem. There is also a support group when you complete the program. This is not a program for those who want the easy way out, you also have to work (exercise) to achieve.

  • Does the product contain wheat?

    Does the product contain wheat?

    • Roca Welch

      No, the products do not contain wheat.

  • My daughter lost 14 pounds.
    diane (Verified Purchase)

    my daughter has been doing this for a month and only lost 14 pounds also she is starting to have double over stomach pain…why is that?

    • hs

      14 pounds is a lot in 4 weeks. Tell her to keep it up!

    • Cynthia

      She is losing at a good pace.

    • Larry

      Make sure you are including some benefiber-type product for bulk in your diet. Could be constipation related. Benefiber is more expensive but you can buy a house brand at CVS that is more reasonable.

    • Kathleen

      Eat prunes5/6aday

      • Lori

        Do NOT eat Prunes ! they are full of sugar! Buy some sugar free Metamucil.

        • Cindy

          Thank you for that little reminder duh I need to take mine out of the refrigerator now

    • Roca Welch

      Optifast is a medically supervised program. Call her doctor immediately. She could have a gallstone problem.

    • Carol

      She may be experiencing pain in her gall bladder. She may have to have surgery to remove it.

    • Cindy Coffman

      I’ve been reading everybody’s comments about the gallbladder. I was on Optifast many years ago and ended up in the hospital with gallbladder issues. Although the issues went away and I also lost 60 pounds while on the diet. I would have her checked out just to make sure.

  • Why feeling side effects?
    mlavenia (Verified Purchase)

    I just started optifast yesterday.Today, after slight exertion I found myself sweating profusely and not feeling good. Prior to eating I did a fingerstick and it was 157, the highest its ever been fasting. Can anyone explain why this happened?

    • kathy

      I’m a diabetic also. When I started Optifast my doctor warned me that my blood sugar could bounce all over the place initially since I stopped all diabetic pills when I started Optifast. I have been lucky and my blood sugars have been between 94 and 113. Give it a little time and you should level out.

    • Stacia

      Wondered if Mlavenia could share w/us the cost of the program. If it’s REALLY expensive I’m not going to bother making an appt @one of their clinics!

      • Cindy

        The way I look at it depends on what you spend on food for your household and how much you eat but and maybe a few dollars extra than what you spend normally but which is way worth it!

    • Anonymous

      How much sugar is in each shake? That would easily raise blood sugar. Especially without the added fat to slow digestion.

  • R the ready to drink shakes soy based or lactose free

    R the ready to drink shakes soy based or lactose free

    • Jan

      Short answer, no. They contain milk products and all contain about 1gm of lactose, except for the vanilla powder, which contains 8-12 grams of lactose.

      • Angela

        Eat Pork!

        • sue

          I just my first 2 weeks on the opti-fast 900. So far its been 3 days, anyone finding 4 shakes a day hard? I know I am, there are so filling. Plus I have to drink tons of water. I hope the weight loss starts soon.

          • rocco

            I just did my first weigh in lost 10 lbs first week. I know the people who say they lost 20 lbs in a week are lying. no way. I followed this to the letter. not one thing did I eat I wasn’t told to. 3 shakes , one soup I bar. I never heard of losing twenty lbs in a week. stone cold lie to the people on here don’t listen to the people who are lying. The program is good. little hard, the meetings are good. Don’t get down if you don’t lose twenty lbs in a week. that is a person who is lying. its impossible to do.

            • kim

              My husband lost 18.5 lbs the first week! Me, only 9. Figures!

            • Elizabeth

              Everyone’s metabolism and body fluids are different. You did a great job for yourself and YOUR journey. Don’t criticize someone else’s journey. They may have more weight than you to lose. Be kind and encouraging.

            • Anonymous

              I lost 14.2 my first week. I think it depends on how big you are

            • NikkiD

              I would imagine it would depend on several factors. Age, starting weight and exercise are a few. Younger folks lose faster.

          • Cathy Staerkel

            All I think about is food. The shakes are just too blah. This is 3rd day for me and I dont know how I will do this for 4 months. If the taste were better or the nutrition could be in the form of crackers , just something to vary from the shakes, I could see success with the program. Despair…

            • Bre

              Believe me, all I think about is food too, but I’m still going strong on the Optifast diet. I started at 178.5 lbs and I lost 8.5 lbs in the first two weeks with total meal replacements (4 chocolate shakes and 1 soup per day). It’s hard, but is worth it!…My clothes are already getting loose! I eat lots of food in my dreams now lol not going to lie! It’s such a relief that I don’t have to worry about making food for myself anymore or have a pity party after I binge eat something I shouldn’t have. Also, I feel like my taste has changed…initially I put less water in the shakes so the favor would be stronger but now I prefer more water and the taste doesn’t bother me anymore. It’s quick and very convenient…it’s been such a blessing! Hope you continue on with the program 🙂