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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 12 of 14, 263 total comments)


I started Opti Fast. I did not pay a $550 initial fee. However, I am going to a doctor for bariatric surgery and this is the prep. I would not do this diet without being under a doctor's or nutritionist's care. I am doing the plan where you can eat one meal a day. It has been 2 weeks and I have lost 10 lbs. Yes, there is hunger. Yet, I have found that it is getting easier. Because it balances your blood sugar levels, I am not having overwhelming cravings. In addition, I feel that since my addictive trigger, food, has been removed for the most part, I am having an easier time of it.

posted May 26th, 2008 1:03 pm



posted May 12th, 2008 9:19 am


I went on Optifast March 2007, and lost 40 pounds in 12 weeks and surpassed by goal. It was the best program, and I didn't want to go back to food. The first 2 weeks are the hardest, then you don't think about it. I have regained 15 pounds since Feb, as I had surgery and was stuck at home. I am back on Optifast, day 2, to regain control again. I am hoping 6 weeks will be enough.

posted Apr 30th, 2008 8:46 pm


l REALLY need to lose weight fast but l am scared to start , reading the comments about the hunger l dontknow. STOP!!! am l in control or the food. l shall keep you informed l am in Australia

posted Apr 28th, 2008 8:31 am


I started Optifast for 1 week. It was hard. I didn't realize how much I thought about food. I did lose 5 lbs but got sick and couldn't continue. I am thinking of starting again, however, it's t's hard to get past the taste of the foods. There isn't hardly anything I like. The prepared shakes are a lifesaver. You should take one with you whenever you leave your house and a bar or two also. It upsets me that the shipping is so expensive. I wanted to order a case of prepared shakes for about $60.00 but the shipping was $20.00 and I just wouldn't do it. It makes the product just too expensive. I'm trying to decide what to do now.

posted Apr 17th, 2008 7:08 am


I'm only on the second day of the program and I'm very worried about my self control. I love the program so far and it sounds very promising but I wish I had gotten a little more preparation to start the diet. I've already snuck a handful of Goldfish and I keep eyeing the food on tv. I am only 21 and I weigh 214 pounds, I want to lose 65 of them. I just hope that I won't corrupt myself and not allow the weight to come off. Do you know if you're allowed to eat any 0 calorie foods like carrots or something to curb the food cravings between shakes?

posted Apr 13th, 2008 9:42 pm


I have been on the diet for 2 1/2 weeks now. I have already lost 17 pounds and only have 25 to go. The first 2 weeks are hard, but adding splena into the shakes really helps. I also add hot sauce into the tomato soup which is really good. You do after about 10 days feel like you are finally in control instead of the food controlling you. It really is worth every penny. Maintaining will be hard, but not as hard as losing it!

posted Mar 26th, 2008 8:55 pm


Started last September, I lost 80 pounds via a weight management clinic which included Optifast for twelve weeks. I have followed the program, and have kept the weight off. With the right balance of exercise, diet and medical supervision, Optifast worked for me!

posted Mar 24th, 2008 4:37 pm


In Australia, Opti Fast costs about $60-70 per week and now has bars and soups available. That is VERY cheap if you stick to it becasue remember, it's not like you are buying other food!

posted Mar 23rd, 2008 6:53 pm


It has been eight yrs since I was on Optifast. I lost a total of 42 lbs. which was my goal. I kept it off for 2 yrs and believe I would've kept it all off as I changed my lifestyles and eating habits when I was through with the program. Unfortunately, I was involved in an accident that left me at the mercy of whoever was providing my meals until last year. I am going to go back on Optifast, with my doctor's blessing, in a few weeks. It is the most convenient way to diet especially if you have a busy lifestyle. Just pop open the box and there it is...I even enjoyed just the plain vanilla flavor. I never suffered from hunger pangs nor did I have any cravings once I started. Not sure if insurance will pay for any of this, but will make it happen some how. Good luck to all.

posted Mar 13th, 2008 3:55 pm


7 weeks in and I've lost 27 pounds. Like most other comments, if you get past the first few days, it gets easier. Supportive family also helps, not asking to go out to dinner, etc. Really think about the long term. So many posters note that they gained it all back. That tells me they didn't learn through the process and didn't alter their thinking. So far, best decision I've made about my healt.

posted Mar 12th, 2008 1:10 pm


I have been doing this diet MODIFIED, (which means 3 shakes, 1 nutrition bar, one real food snack and one real food meal). The weight loss is slower, but I have been able to stick with it through Thanksgiving, Christmas, my birthday, etc. - 16 weeks and I lost 27 pounds - almost halfway to my 60 pound goal. I find it is easy, does not involve a lot of measuring, weighing, calculating and thinking about it. Have controlled my borderline diabetes, and lowered my blood pressure.

posted Mar 5th, 2008 9:38 am


I just completed my first week on the program and have lost 6 pounds. I only want to lose a total of 30 so only 24 more to go! If you mix the shakes in a blender with diet sodas they taste much better. My favorite is diet orange and vanilla shake! I use Benefiber in my shakes in the morning...can't taste it at all. Another favorite is to mix decaf coffee with a chocolate shake (either hot or even with ice for a treat!!) It really hasn't been too bad. The hunger is bad but I hope that it will get better!!

posted Mar 3rd, 2008 3:28 pm

Ak Chris

Well I am now into my fourth week of opti fast. I have lost 20lbs in three weeks and i feel great. After the second week my Doctor adjusted my program I now have four optifast products a day and i am allowed 460 calories. So can have some real food and it is great!! love it so far

posted Mar 3rd, 2008 8:02 am


I have been on optifast for 18 weeks...I lost 53 llbs and am 20 from my goal weight...i will transition back to whole food then back on opti for he last 20...i was considering bariatic but was just shy of the weight I needed to be to qualify. I'm riding my horse 4 days a week now like I used to before I gained all the weight and can't wait to make goal. I really like this program.

posted Feb 25th, 2008 7:48 pm


I am going on my 4th week on the oprifast and I think its going ok. The first couple of days were really hard but everyday now gets easier. I feel better I think i have lost about 18 pounds. I use the taranis flavoring in my shakes to add flavor and drink a lot of water. I also use an off brand of crystal light to flavor my water.


I am going on my 4th week on the oprifast and I think its going ok. The first couple of days were really hard but everyday now gets easier. I feel better I think i have lost about 18 pounds. I use the taranis flavoring in my shakes to add flavor and drink a lot of water. I also use an off brand of crystal light to flavor my water.

Australian Angel

I am in my third week of the opitfast program, my first goal is 15kg then I am hoping to have a short break before challenging my next goal of 5kg. I have a shake for breakfast, a bar for lunch and a calorie controlled meal for dinner (avoiding carbs) it is getting easier however I am also experiencing constipation. I tried a laxative but they are too extreme, I am currently drinking 1/2 cup of prune juice morning & night which seems to be working so far. Sometimes I have a pear which is great too. I have lost 3.5kgs so far next weigh in 4 days. I don't find it expensive, I order online at there prices are about 20% cheaper than at the shops. I love the chocolate bars, they taste like space food stick. Yummo!


I am now on day 5 of being on the program. Even though I am drinking all the water required, I feel very constipated. I do not like to take medicine or metamucil. Do you have any suggestions of what I could eat along with the optifast to get that added fiber?

Ak Chris

I am on my fourth day of the diet, And let me tell you it has been tough for me. All I can think about is eating all my old favorites. Like pizza toca bell..etc.. I can almost taste them. It really is taking everything I have to not stay away from the diet. My first weigh in is on friday the 15th. I hope to see results.


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