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

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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

EDITOR’S TIP: Combine this supplement with a proven fat burner as Sletrokor for better results


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

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(Page 3 of 14, 268 total comments)



what can I do to make the shakes and bars taste better? today has been day 1 for me...and I honestly don't know how I'm going to do this for 3 months!! The shakes do not taste great and the bars are horrible! I haven't tried the soups yet, I don't even like tomato, so I hope they are better than the shakes and bars. I have younger kids so it was hard to make them their meals because they can eat regular food. I'm already feeling the craving for something real!!I know I need this and I'm willing to see how it works, just gonna need some motivation

posted Dec 24th, 2011 3:51 am

jan oye

l was on optifast and got very, very sick with migraines and heart palpitations, l found out 4 weeks later after l quit the diet,because of getting very ill, l had an abnormal EKG to begin with and my doctor that put me on the diet never even told me, l reqested my records, the EKG was taken the day the dr put me on the optifast diet, and he NEVER even told me l had an abnormal EKG, obviously he was in it for the money and not my well being. There will be consequences for him.Be sure to request seeing all your tests before starting the diet, none of mine were brought to my attention,l am extremely disappointed in that physician.

posted Dec 19th, 2011 1:48 pm



I have been on the Optifast 900 4 Shakes/Day plan for 8 days, and have lost 16 pounds. Mostly water, but I can honestly say I have not been hungry. The first 4 days were a challenge, but after that initial point I feel like I have gotten past the most difficult phase. I will now be switching out on shake per day for a meal consisting of 6oz Lean Protein, Low Glycemic Index Vegetables, and a Maximum of 20g of Carbohydrates. (Low Glycemic Index Carbs). So this will be more of a challenge in that I have to do some Nutrition Research to plan my meals.
Basically the Optifast program is set up to put you in a state of Ketosis, similar to an Atkins or No Carb Diet. This diet is not for everyone, and it is not easy or "normal". A box of shakes cost approximately $300.00 Canadian/month for 4 shakes per day.

posted Dec 8th, 2011 12:38 am


Hi, I too will be starting Optifast next week. My eating habits are so bad that I am looking forward to 3 shakes per day and 1 light meal. Good Luck to you.

posted Dec 1st, 2011 9:56 pm



Can I do the Opifast diet if there's no clinic in my area? I do not have an Optifast clinic in my area but I have read everything online & I am ready to try this diet.

posted Dec 1st, 2011 5:34 pm


I start Optifast on Dec 15th, Im nervous about it because I was just diagnosed as a Diabetic II (controlled though) & Hypothyroidism. I am experiencing numbness in my right thigh and hand falling asleep when I lay on them while sleep. I think too much fat in those areas not allowing the blood to circulate. I really need to lose 100lbs. When I went to the orientation to my dismay I weighed in at 260lbs, since my work-up and starting 1200 cal diet and started meds synthryoid/metformin I now weigh 248lbs pre-optifast. Need some encouragement really bad.

posted Nov 28th, 2011 4:55 pm


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 drugdispensary.com 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


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