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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 7 of 14, 262 total comments)


It is a way of life, not a diet. Optifast program has helped me to break bad eating habits while helping me shed those pounds to start my life on a healthy path.

posted Feb 7th, 2010 6:41 am


Greetings and Happy New Year! This is the first new year that I did not make a resolution to lose weight. Instead, I ran a 1/2 marathon in excellent time and really happy to enter this year and new decade on a high note.

As some of you know, I have been in a weight loss program since September. It has been an amazing 17 weeks thus far and I have been using OptiFast for 12 of those 17 weeks. I have lost a total of 86 lbs I started off weighing 256 lbs and as of this morning I weigh 170 (I'm 5'7").

I'd be remiss if I did not mention that in addition to OptiFast, my weekly one on one session are used to restructure cognition around food and the doctor requires that I walk 10,000 steps AND engage in some physical activity for a minimum of 30 minutes per day. Since Sept I have not missed a day of working out (I have not always reached 10K steps). My workouts include swimming, running and circuit training at the gym. The best parts of working out for me are feeling great afterwards -- even if I did not want to do it to start with -- and enjoying the physical benefits of being able to shop and wear clothes that actually fit.

There are 13 more weeks in the program and Tuesday I begin the transition phase where I curtail my usage of the OptiFast. I'd like to hear from some of you who have gone through the transition phase wit OptiFast. More specifically, how did you deal with eating food after being not eating it for 12 weeks (in my case)? Are there things I should expect? I'd really like to draw on your experiences and knowledge.


posted Jan 17th, 2010 9:24 am


I knew I needed to lose weight when I went skiing with my friends and realized I couldnt. I realized that if i fell, i was too big to be able to get back up.I started optifast Jan 2 and am really liking the diet so far. my doctor prescribed phentermine, and i think it is helping me from being hungry. The first day on phentermine, i felt a bit off (jittery and a headache) but that was the only day I felt bad on it. the shakes are good, especially strawberry. I weighed myself this morning (start of day 3) and have lost 5 pounds- so now Im 201 and 5'4. I'll keep updating everyone on how i do.

posted Jan 4th, 2010 2:30 pm


Happy Holidays to all. Dec 21 I weighed 318 for a total of 29ibs loss thus far. I expect from this point forward to average a loss of 5-7 pounds per week as long as I stay focused and stick to the plan.My goal is to lose 120 - 140 pounds. Continued success to all.

posted Dec 25th, 2009 9:01 pm


Congratulations on your weight loss Ruben! Way to go!!!

I, too, have been on Optifast. I am entering the 13 week of an overall weight loss/weight control program (but 9th week of Optifast). I have lost 71 lbs thus far and have really been amazed by my determination and ability to maintain such a strong commitment to the program. I am looking forward to eating food again but really think that the skills that I have acquired and refined will help me maintain the loss.

Initially working out has been difficult for me to do but has become increasingly easy. It helps that I bought some weights for home and on "lazy" days when I don't feel like going to the gym I do a circuit workout or yoga.

Good luck with your program and keep up the good work!


posted Dec 20th, 2009 11:18 pm


I am ending week three on the Optifast diet. I weighed in at 347 on November 30and at the beginning start of week two December 14 I weighed 325 pounds. I am happy with the results and religiously adhere to the 4 shakes,1soup, and 64 oz of water. I also walk on my treadmill and ride my bike every day for at least 30 minutes. I also have the support of my wife, family, friends, and colleagues at work. I am writing today because this has been a tough day for me and itis the first time that I can say that I have been truly hungry and hungry all day. But I am fighting through this and keeping focused on my goal and taking it one second, one minute, one hour, and one day at a time. I've got 17 more weeks to go and I believe I will be successful in reaching my goal of losing 130 and keeping it off.

posted Dec 20th, 2009 9:28 pm


So I forgot to update in early November. I am now in week 11 and have lost 47 lbs.

posted Dec 18th, 2009 5:48 pm


I started Optifast 1/12/09. I was 201.2 pounds (I'm 5'3"). On 9/15/09 I was down to 120 pounds. I've been on maintenance ever since. I go to my maintenance classes religiously. I still buy enough product so that I can have a shake for breakfast and a shake for dinner (I prefer a protein shake before I work out in the evening). I eat one healthy meal a day and two or three healthy snacks. I work out for one hour six days a week on an elliptical trainer. It's been over two months and I have maintained my weight at 120 pounds. I'm not always perfect and sometime find myself slipping but I use all of the tools I was given. Keep at it. You can be as successful as I have been. I know it's only been two months, but I feel completely in control.

posted Dec 6th, 2009 11:27 am


I have started the OptiFast diet two months ago. For the first month I monitored my eating habits and met weekly with psychologist. During this phase, I lost about 22 lbs. I have started the second phase -- solely using the OptiFast products for 12 weeks. I have lost about the same amount of weight so far that I lost during the first phase (where I ate my own food). Thus, I have lost a total of 46 lbs.

I'd be remiss if I did not state that in addition to OptiFast, I am walking 10,000 steps a day AND working out for 1/2 each day (sometimes more). This is and important part of the program and the most difficult part.

I only struggled the first few days on OptiFast but find the OptiFast products to be really good (how can it not be good given that Nestle make them!). I use a combination of all of the products daily. I typically have two ready-to-drink shakes, one powder, one bar and one soup. I also drink water, coffee, tea and Coke Zero everyday.

The best part so far is that I went from wearing a 40 waist to a 32 in just two months! I originally set out to lose 60 lbs and I am nearly there. However, I have decided to recalibrate my goal and lose an additional 25 lbs.

If anyone has any questions or needs support -- please respond to my post.


posted Nov 18th, 2009 7:15 pm


My name is Ruben and I am on week 5 of the Optifast Program. So far I lost 18 pounds. I did expect to lose more in this time but I realize I have not given this diet a chance to work 100%. I have stayed away from food but I would get a bag of popcorn every night I worked. I also put sugar and coffe mate in my coffee everyday. I decided to give my all to this diet to see what will happen. I will get my weigh in on Monday and will post the results.

posted Nov 5th, 2009 8:48 pm


I forgot to mention my first week weigh in I lost 11.5 lbs. Can't complain about that :0)

posted Sep 16th, 2009 7:04 am


Went for my second weigh in and lost 1 lb. Consultant said my yo yo dieting is coming back to haunt me,which makes sense. My body is waiting for the next binge. She said give it another week and I will start losing quickly....I agree. Im going to really focus on getting in a lot of excercise this week.

posted Sep 16th, 2009 7:03 am


I started the program 11 days ago and I lost 11 pounds. I hope to complete the entire program. Good luck to all of us.

posted Sep 15th, 2009 5:15 pm


I went into the office for a consultation on Tuesday, August 20th and my dr appt, ekg and bloodwork was on Thursday, August 28th. I then had a follow up with the dr on September 1 and started on September 2. Today is my first weigh in and group meeting.

posted Sep 8th, 2009 6:15 am


I went into the office for a consultation on Tuesday, August 20th and my dr appt, ekg and bloodwork was on Thursday, August 28th. I then had a follow up with the dr on September 1 and started on September 2. It's been one week, I go in for my first weigh in and group meeting today.

posted Sep 8th, 2009 6:12 am

Kelly Agler Meador

How soon after your initial consultation do you have bloodwork done and when do you actually start the program. I have my consult on sept.14 and very anxious to get going. Is there anything i can do to help prepare?

posted Sep 4th, 2009 8:17 pm


I'm on day 1, had my first supplement...vanilla mixed with coffee, very good. I have 120 lbs to lose, I pray this works. The only thing left is surgery.

posted Sep 2nd, 2009 6:34 am


Kaiser does not pay for the plan. You have to pay the full cost yourself.

posted Aug 25th, 2009 7:06 pm


Jerri, how did you get Kiser to pay for it all.

posted Aug 24th, 2009 11:34 am


I started optifast on August 14, 2009 and i have lost 7pounds! Of course, this was the first week and I broke down a few times in the middle of the night with twix bars, milky ways, pancakes, anything sweet. I will not do that next week and maybe more weight will come off.

posted Aug 23rd, 2009 10:55 pm


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