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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 8 of 13, 255 total comments)


I love this diet ! I have lost 25lb.'s since April 1st. I am losing slow so I will not regain ! I buy off ebay & I did get a check up 1st . I am doing this on my own & feel better than I have in 20 yr.'s ! I wore a 18W & they were so tight & now I am wearing an 14 misses & they are getting baggy so in about 2 weeks I will go for a 12 . My point try it ! You will love it ! I start my morning with a optifast choc. meal bar & one cup of BLACK coffee . Also I got the powder & the R2Drink shakes when I first started . Get the powder & get a shaker at GNC it has a sping in it 2 shake it . It works great & it is fast ! It tast better & you get more 4 your money ( 84 ) pk.'s & I put 10 0z. of cold water(bottled) & I drink a shake every 3.5 - 4 hours & I stay full & I may take an Nexium 1 time or less per week & B-4 2 per day & that did not help sometimes ! Also make sure you drink bottle water or fillter ! I drink the 20 oz an I drink around 6-8 per day . I hope this helps those of you who want 2 know how many oz..'s you get in the R2Drink ( get the powder) & ebay is where I get mine & check the date & ask if they do not say ! I will get my blood work done again the end of the month & I am sure it is going 2 be great !! I am doing this 4 me & 2 drop 50-55 lb.'s but most of all 4 me & I feel great ! People ask me all the time how much do you want 2 loss & I say 1 lb. at a time ,cause it is 2 much pressure on someone 2 say a big # when you just say 1 lb. at a time ! Good luck 2 all of you ! I hope you all have a bess day !

posted Jun 12th, 2009 12:21 am


I have been on Optifast since 2/5/09 I started at 241 lbs, I am now at 168 lbs. I love the program, I have never cheated and I exercise at least 4 days a week. It's the easiest diet I've ever done and I've done a lot, I plan to make this my last diet.

posted Jun 2nd, 2009 10:24 pm


There's 8 oz. per container.

posted Jun 2nd, 2009 8:38 am


Can anyone tell me how many ounces are in the ready-to-drink boxes of Optifast 800?

posted May 29th, 2009 12:20 pm


i really need to know where to find these shakes without paying so much money. thank you

posted May 25th, 2009 2:22 am


Just started Optifast today. Reading all these reviews is very encouraging and motivating. I need to lose 60lbs to get back to normal-healthy weight.

posted May 20th, 2009 4:44 pm


I started Optifast 4/27/09 and so far I've lost 15 lbs or so. My weight loss is not what I was told it would be, but I can live with it. If I go back to when I start losing weight, then so far I've lost nearly 40 lbs., down from 212. I still have a long way to go and I intend to go until I get to my pre-baby weight of 120-125 lbs. I will admit that the program is expensive, but if you have insurance, it will pay for the doctor visit, just not the product itself. I've been on the Optifast 800 plan and they have the soups and bars and things at the CONCI center in Columbus, but I prefer the shakes only because it's easier to find cold water on the run than it is to find hot water. Crystal Light popsicles are great, as are diet orange pop and diet Hawaiian Punch and diet V8 Splash Berry Blend. All these can be consumed on the Optifast plan. It would be great if insurance paid for the product, but I guess it would make too much sense.

posted May 16th, 2009 11:25 am


In the US, are any of you able to find or order the Optifast chicken or tomato soup? I have heard they are out of stock, and havent been able to order any since Jan 09. If any of you know a supplier with soups, please help.

posted May 15th, 2009 2:13 am


I have been on this program for 2 weeks now and I have lost 13 lbs...the first week was really hard but now I am getting use to it...gotta have a very strong will to lose the weight or this diet is not for you..keeping busy also helps so I dont get too hungry.

posted May 5th, 2009 3:24 pm


I'm on my 2nd week and I've lost 18lbs. total, my cravings are almost zero at this point; these words are a great inspiration to me.
Hope it inspires you as well: )

posted May 5th, 2009 11:17 am


Amazing!!!! It works and I 100% recommend it. If you are tired of being overweight, want something with results, and are willing to stick with what they tell you to do - this is THE Program. I am 38 years old and grew from 125 pounds to 170 over the past 3 years! I tried EVERYTHING!! Optifast works and it works fast. I started the program a week ago and have already lost 5 pounds. I am certain this will get me where I need to be. I am NOT hungry since I am eating something every 3 hours. It works with my very busy schedule ( I travel a lot for business) and I don't have to think about it. The shakes are actually GOOD, the tomato soup tastes great and the bars do not have that vitamin taste - love them.

I will certainly keep everyone posted on my progress but am very excited to see these results and it's a HUGE motivator to stay with it.

posted May 1st, 2009 4:15 pm


I had just about given up on dieting, up to 236 this will be my last chance. Started the program 4/15/09 and have lost 8lbs. Not hungry very often, but favorite food flashes in my mind often. 49 years old and would like to feel good, and look good. I went on line to get inspired, and it worked. Thanks for the positive messages. I will keep going strong.

posted Apr 30th, 2009 6:58 pm


Way to go Carla, isn't it a wonderful feeling.
I packed my pounds on in 2 years, and got tired of being uncomfortable in my own skin, I feel in control of my body again. I'm on a schedule now, I don't give myself a chance to get hungry, in between shakes, I drink 2 quarts of water, 1 qt with a yummy Benefiber citrus punch drink mix, thats filling for me and it all seems to be working, I have more energy and clarity than i've had in years.

posted Apr 29th, 2009 9:28 am


I love this program. Nicole, it sounds like you and I have the same amount of weight to lose. I just completed my first week and am thrilled with my 10 lb. weight loss. It definitely will keep me motivated this week. Are you still feeling hungry at all?

posted Apr 28th, 2009 5:41 pm


I started Optifast on 4/20/09 and after one week, 4/27/09, lost 10 lbs.! I couldn't belive it. I was thrilled. I started this at 224 and now weight 214. My goal is 170 and I'm not going to quit!!! I'm looking forward to learning to eat healthy and sticking with this for the rest of my life. I want to do this for my health. At 51 years old, it's about time I lose this weight once and for all!

posted Apr 28th, 2009 10:59 am


Started Optifast on Monday 4/20, weighed in @204, today is Monday 4/27, I weighed in @ 190, the first day was a little trying but I got through it, piece of cake : ) after that, 40 more to go.

posted Apr 27th, 2009 2:37 pm


I tried tons of diets and exersices and non cut it. Ive been on this for 2 weeks and have lost 14lbs

posted Apr 27th, 2009 12:21 am


Has anyone had any success with Wonderslim products as opposed to Optifast products. I have an appointment next week to start an Optifast program and need some feedback on what to expect. Thanks

posted Apr 15th, 2009 11:40 am


Lost lots of weight. It was easy to do because it made eating simple.

posted Apr 6th, 2009 9:54 pm


Is anyone following this program without going to a clinic or a nutrionist/counselor? How important is the medical monitoring during this program? I can buy this product on line, but I was curious to know if anyone is using the product without medical supervision?

posted Apr 5th, 2009 7:43 pm


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