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based on 122 reviews


Program offers 12 weeks of meal replacement to help you lose weight.

QUICK FACTS Start the Diet Now Advertisement
  • Established: 1974
  • Founder: Novartis Medical Nutrition Corporation; now owned by Nestle HealthCare Nutrition
  • Stock Symbol: NSRGY
  • Headquarters: Florham Park, New Jersey
  • Accessibility: Online, weekly one-on-one counseling
  • Diet Type: Meal replacement, liquid
  • Gender: Male, female

The OPTIFAST plan has been considered the ace of liquid-based diets since 1974. The meal replacement drinks and bars are recommended by physicians for patients weighing more than 50 pounds over their ideal weight or with a Body Mass Index (BMI) of 30 or more. OPTIFAST is recommended to help obese individuals prepare for gastric bypass surgery as well. All participants have full access to professionals like doctors, dietitians and counselors.

The OPTIFAST program follows strict guidelines to ensure the health and safety of patients with three key areas of concentration - medical, behavior and nutrition. Patients have an initial medical exam to make sure they meet the program criteria.

Progress is monitored during weekly one-on-one and group counseling, to help encourage healthy lifestyle changes.

  • People will lose weight on the introductory phase
  • Your weight loss is monitored by their experts
  • Proven results with clinical studies and over 1 million participants
  • Program gives support and counseling along with weight loss
  • Medical monitoring while on the program
  • Offers decrease in cholesterol, high blood pressure and high blood sugar levels
  • Great tasting meal replacement shakes
  • Doubtful that most health care professionals would recommend being on a meal replacement plan for any extended period of time
  • Program consists of all liquid diet
  • May be cost prohibitive for some

To participate in Optifast, you must first complete a preliminary medical exam. You will be assessed to determine any risk factors and make sure you are a good fit for the program. After passing that exam, you are given a personalized weight loss plan that is based on your current weight and your goals. You are monitored throughout the entire process. Your meals will consist of the Optifast shakes and meal replacement bars.


You get a customized activity plan for your fitness level and schedule.


Maybe the OPTIFAST meal replacement is nutritionally sound, but there are plenty of other programs that have you making sound choices with real food. This program is also very expensive. This combination can only lead to the conclusion that there are other choices that would come before OPTIFAST.

Common Misspellings

optyfast, opti fast, optifast progarm

Related Diets: Juice Diet, Slim Fast 321, Slim-Fast, Medifast , VF Smoothie

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(Page 3 of 13, 255 total comments)


Hello everyone!

I'm on Day 13 of my Optifast diet and I've already lost 18lbs! :)

It hasn't been easy. I'm still craving but I know I can and I must do this. No one said it was going to be easy, but it'll sure be worth it.

I'm taking it one shake at a time. If you're on the diet now, know that you're not struggling alone.

Just remember...

One shake at a time. :)

posted Sep 19th, 2011 10:54 pm


I have done a version I modified so I would stick to it- 2 shakes, 2 snacks from the optifast lists, one proper meal and a yogurt for dessert. I find it is very useful and easy to stick to this way. I expect when I have lost the weight I will still use these shakes to make sure I always have a healthy meal with me- something which has tripped me up before.
I make sure to drink plenty of water before the shake or soup so that I feel fuller. I have done the three meal replacements, but I found it too hard, but am happy with my weight loss (on average 2- 2 1/2 pounds)

posted Sep 17th, 2011 8:01 am


I am really having a very easy time adjusting to it. Its a fantastic diet I have about 100lbs to lose now. Two weeks ago it was 115lbs I am down 15lbs in the first two weerks. The shakes are delicious.

posted Sep 15th, 2011 6:17 pm


I am going in for my first Optifast meeting and to pick up my food tonight. I am very excited about getting started. Ulitmately, I want to lose around 120 pounds. I will keep you posted on my progress.

posted Sep 6th, 2011 10:41 am


Finished week 12 - down 40 lbs.! Today I start the next 6 week phase of the diet. Feel much better, more energy, feel younger already - I'm much more active now - feel great.

posted Aug 31st, 2011 1:22 pm


I am 9 days into this diet and I am not a religious person but Im about to say something "" Im thanking god everyday I found this diet.. I have not put one piece of food into my mouth and I feel damn awesome,, I have lost 10 lbs and I have tried everything out there I have spent thousands on CRAP and this WORKS,, dont let anyone tell you it doesnt because I would go to bat for this company whatever is in it WORKS,, I am NOT hungry in the least,, I feel fantastic I have energy I am alert and wide awake I cant stress enough how glad I am I found it,, and its worth the 110 I spend a week ,, If i wasnt spending it on this,, I'd be spending it on FAST FOOD AND JUNK,, so the price is a very small PRICE to pay for my life thank you optifast 900 :o)

posted Aug 30th, 2011 8:46 am


Depending on your insurance, you probably will have a Doctor's appointment co-pay/ per visit. The meals come 7 in a box and a box typically costs $25-28 - so for a week supply of meals you would need 5 boxes = $125-140 generally - at least that what I have experienced. If you stick to it, the Diet definitely works and it works fast. I find it quite satisfying and I'm not hungry. The weight loss is very motivating. Good luck!

posted Aug 26th, 2011 1:53 pm


I am considering the Optifast program but am confused about the cost. I have seen people posting costs ranging from $500 up to $1000 per month. Can anyone tell me an approximate cost to expect at my upcoming seminar?

posted Aug 22nd, 2011 3:03 pm


I have been on Optifast for the last 7 weeks. Went in for my weigh in this morning and lost a total of 4.4 pounds for the week. In 7 weeks, I have lost a total of 27.6 pounds! I'm excited about the weight loss. For the first 4 weeks, I did strictly the ready to drink shakes and mixed in a couple of tablespoons of benefiber so that I wouldn't experience any constipation. In week 5, I reduced down to 4 shakes and incorporated a chocolate or peanut butter optifast bar. I've been making sure to get all of my water intake. It is critical to drink the water. I started out at 254.4 and am now down to 226.8! I am hoping to get down to 165. I feel great and look forward to sharing my weight loss success with all of you!

posted Aug 17th, 2011 3:46 pm


I'm on week 10 of Optifast 800 and have lost 37 lbs. so far. Went through a little plateau around week 6 and quit drinking diet drinks and caffeine (mostly water and herbal ice tea now) and that helped. I have tried many diets in the past but this diet surpasses them all - the shakes are good and I am not hungry and most importantly I'm losing weight and it keeps coming off. The first few weeks I had some muscle cramps and light headedness but that went away and I started exercising. Now I have a lot more energy and have the confidence that I really can lose the weight and reach my goal finally. I would like to lose about 60 more lbs. - but I break it up into mini goals, so it doesn't seem like Mt. Everest. Next goal is to lose 25 lbs., then 25 lbs. and finally work on the last 10 or so. These blogs have helped me stay motivated. If anyone has any advice or questions - please don't hesitate to comment/ask. Keeping motivated!

posted Aug 16th, 2011 6:11 pm


I will be starting the opti-diet next monday I have 125 lbs. to lose. It blows my mind, how I got to this weight.. well the time is over ,, time to quit whining to myself and feeling sorry for me, its time to step up so I am and Im gonna knock t his out of the park,, Ill keep posting on here too, all my updates.

posted Aug 14th, 2011 12:22 pm


This my second challenge with OPTIFAST 900. The first time I lost 40 lbs. I get back all the weight last winter. This is my second challenge, but very difficult. Can you image, since one week, I did not loose a pound!
I am continuing. But need encoragement.
Thank you,

posted Aug 10th, 2011 1:17 pm


I've been on it for exactly 2 months now, I lost 41.5 lbs and I am more active in my life now, I am doing more since I don't feel tired like before, but I am worried about putting weight back after the meal replacement program is over.

posted Jul 25th, 2011 6:07 pm

joshua dial

I started optifast today, I am doing the 5 servings a day, i dont feel hungry at the moment and I do find myself drinking lots of water, but it helps subsides the hungry urge, i currently weigh 298 and I would like to lose 75lbs, So encouragement from others would be great. I look forward to my weight loss and sharing it with you guys.

posted Jul 11th, 2011 4:54 pm


Worked well for me. Lost 55lbs.

posted Jul 8th, 2011 12:51 pm


I lost 86 pounds on Optifast between January 2009 - September 2009. I went from 208 lbs to 120 lbs. It changed my life.

This message is for those of you who are close to your goal weight or at your goal weight.

Once you have lost all of the weight, sign up for Weight Watchers online or in person. Then follow Weight Watchers for your maintenance. I strongly advise this because Optifast does not have a satisfactory maintenance program and you WILL start putting the weight back on if you do not have a formal maintenance program. Kaiser allows optifast graduates to continue to go to free meetings every week (which is wonderful) but those meetings do not help you manage your daily eating habits. YOU DO NOT MAKE GOOD EATING CHOICES WITHOUT WATCHING YOUR CALORIES OR FOOD EXCHANGES ON A DAILY BASIS.

The other thing I would suggest that you do is that now that you are free from the high sugar, high fat, high alcohol habits (because after you've been on Optifast a while you lose ALL your previous cravings), DO NOT start eating foods that are triggers for you. You no longer have cravings after Optifast, but one taste when you are on maintenance and it's all over. It's like a drug addict who has been clean for a year and then takes one hit of a drug. He's hooked again. You will be too if you do not stay away from your triggers once you are in maintenance.

Good luck to you all. Optifast is the easy part. Maintenance is tough. But with the right methods you can keep it off!

posted Jul 1st, 2011 4:46 pm


I have been on it for 8 days and have lost 8 pounds. I was told the first three days would be the hardest - but it was very easy. I had however done low carbs for 2 weeks before starting this and think that helped. How much water a day is everyone drinking on top of the opti fast shakes?? Is there a certain amount recommended?

posted Jun 24th, 2011 10:10 am


The diet has been a Godsend for my wife and I. We're both more than 100 pounds overweight and until recently were rather blase about it all. It took some straight talk from our GP to get us on optifast and we've really appreciated it. The weight loss has been great so far, but more importantly we've got some great advice and tools to help us in the future.
The support from group members is one of the most important parts for us. And learning to exercise (together...first time ever!) has made all the difference. Writing down goals, keeping track of everything we eat, is a habit now. We're not far off finishing the diet, but we're really looking forwrad to starting our healthy eating futures.
The first week is hard, and that's the truth. I felt tired and grouchy and I cheated by going to McDonalds...I was ready to quit. Luckily we learnt about not giving up and my wife was a real strength (its been great, we take turns urging eachother on). Now I wouldn't dream of cheating, I can sit in burger king with others eating their fries and burgers, and I'm not even tempted. Honestly. I've never had that will power when it comes to food, but I do now. I feel more energetic, I look better, I can do yard work and walk for long distances at a time. I can play outside with my, I'm gettin' all teary, here.
Optifast has worked for us. It's started us on our way to the rest of our lives.

posted Jun 15th, 2011 10:25 pm


I am finishing my first month on Optifast, and am happy with my weight loss, the support, and the medical oversight. There are many blogs with success stories. My own Optifast journey is at I have 12 weeks to go and expect great things, both for weight loss and overall health, including lower blood pressure.

posted Jun 12th, 2011 10:04 am


I am on my second day and very weK, is that normal?

posted Jun 4th, 2011 4:51 pm


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