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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 3 of 14, 262 total comments)


Hi Sharon
I will be starting on Nov. 2nd. So I wish you well. I think a support blog would be very helpful, so I am glad I ran across this page.

posted Oct 26th, 2011 5:40 pm


I will be starting the Optifast program on Nov. 1st., which is also my 66th birthday! This is my present to myself to lose weight! I have about 100 pounds to lose, so this is a big undertaking. But I am up for the challenge! I don't know if anyone knows it or not, but there is an excellent support page on Facebook for people who are on the program. I will be going through Kaiser for my program and I have been very encouraged by all of your posts on this site. I am eager to get started.

posted Oct 22nd, 2011 1:43 am


it has been six months since I stopped opti fast, when I first started the shakes I weighed in at 80kg, I actually lost 10kg in the month I was on optfast, after my diet I put on a couple of kilos but truthfully I am now 72kg and staying at that weight without trying, so YES, optifast is great, although I have a good eating habit I'm naturally a healthy eater, I would rather eat fruits for a snake rather then potato chips or junk, but optifast helped me keep cut each of my meals into half, as I feel fuller quicker then before I started my diet, I am very happy with my results and I do recomend this diestplan as it has honestly made me feel so much better about myself, I plan on going back on optifast for a month, just to lose some more kilo's for summer, but please know I lost 10kg in a month not just because of the shakes, I did some heavy duty working out, I did 40mins everyday minimum, so it didn't come off that easily..

posted Oct 11th, 2011 11:36 pm


I'm in the middle of my second week of Optifast. Kaiser wants us to drink a gallon of water a day (this counts the optifast drinks as part of that gallon). So a 20oz water bottle with each meal will do it. However, getting a night of uninterrupted sleep is a challenge since I have to be up every 2 hours to pee. I'm trying to settle on a schedule where I don't drink anything too late in the evening. It seems to be working. I started to cut back on my caloric intake after my initial meeting with the doctor and managed to drop about 8 pounds on my own in the two months before going on the diet. But now the weight seems to be dropping at a steady and safe amount. I'm happy as long as the trend continues in that direction. I've also joined Zumba and dance classes for exercise and a long walk on weekends. That seems to be helping too. I have 50 to 60 pounds left to lose to get me at a healthy BMI.

posted Oct 8th, 2011 3:13 pm

Gerri Leavitt

Anyone their Optifast shakes from in New Zealand and if so how do they compare to Optifast 900 shakes which are available locally - i'm waited to be accepted into an Optifast program and my local hospital is asking for $120-$130. per box but drugdispensary sells them for $57. per box - any info would be appreciated. A friend gave me a box of Optifast 900 and I've started them but too soon to say how much i've lost.

posted Sep 30th, 2011 8:07 pm


I just attended an orientation and hope to start Optifast in October. I'm going to blog about it hoping to give a realistic view of what the program is about and my experiences with it. I've been searching online all day looking for a blog to help me and couldn't find one. It seems most of the Optifast bloggers stop blogging after a short time on the program. I hope this isn't a sign. To read the blog go to: www dot leavingfatburgh dot blogspot dot com.

posted Sep 29th, 2011 6:23 pm


Today is my first day of the Optifast Diet! I was totally mentally prepared for this but my first day is already a disaster. I'm not really feeling the taste of the soups. I'm not really hungry but am already craving the sensation of actually eating regular food. Ugh this is gonna be a rough road. I already cheated and had a bite of a Fig Newton and a few bites of a cookie. Soo disappointed. But that's ok I can do this!! Getting back on track. Might have to go bed earlier today so I can stop thinking about food.

posted Sep 28th, 2011 11:08 pm


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


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