OPTAVIA and Medifast are two weight loss programs owned by the same parent company, Medifast, Inc. Both use pre-packaged meal replacements called Fuelings to simplify caloric restriction. The programs share identical products but differ in how they are sold and the level of support they provide.
OPTAVIA launched in 2017 as a rebrand of the older Medifast program. Both use the same Fueling products with identical macros. OPTAVIA's 5&1 Plan targets 800 to 1,000 calories per day with one-on-one coaching. Medifast's 4&2&1 Plan is self-guided with more home-cooked meals. Both produce short-term weight loss but carry documented risks of muscle loss.
Both OPTAVIA and Medifast deliver short-term weight loss results, but long-term maintenance remains a well-documented challenge for most participants. This guide covers their shared history, how their meal plans compare, what each program costs, the documented side effects, and what clinical evidence says about lasting results.
What Are OPTAVIA and Medifast?
OPTAVIA and Medifast are two weight loss programs run by the same company. Medifast, Inc. founded its original meal-replacement diet in 1981. The company later launched OPTAVIA as its flagship consumer-facing program, replacing the older Medifast plan in the marketplace.
Both programs use pre-packaged, portion-controlled meals called Fuelings. These are shakes, bars, soups, and snacks designed to simplify calorie tracking. Participants eat these products alongside one home-cooked 'Lean and Green' meal per day.
Here is the key structural difference: Medifast was originally sold through physician offices and weight-loss clinics. OPTAVIA sells primarily through independent coaches who were often former clients themselves. About 90% of OPTAVIA coaches started as customers of the program.
Who Owns OPTAVIA?
Medifast, Inc. is the parent company that owns and operates OPTAVIA. The company trades on the New York Stock Exchange under the ticker MED. Medifast describes itself as a 40-plus-year-old health and wellness company with a physician-founded heritage.
Medifast's legal record is worth knowing before starting either program. The company was fined $3.7 million for false advertising in 2012. A federal class action lawsuit was also filed against OPTAVIA and Medifast in 2022, alleging 'dark pattern' billing practices designed to trap customers in automatic renewal subscriptions.
Despite this legal history, Medifast continues to operate OPTAVIA as its primary weight management brand. The company has expanded into GLP-1 medication support with its OPTAVIA ASCEND product line, targeting people using weight-loss drugs like Ozempic.
How Did OPTAVIA Replace Medifast?
OPTAVIA launched in 2017 as a rebrand of Take Shape for Life, a program Medifast had operated for years under the same multilevel marketing structure. Take Shape for Life drew criticism for pyramid scheme allegations and unsubstantiated health claims before the rebrand.
The rebrand was not just cosmetic. Medifast updated its product formulations to remove artificial sweeteners, colors, and flavors. The new OPTAVIA Fuelings were marketed as cleaner and more modern than the original Medifast products from the 1980s and 1990s.
The company also shifted away from physician-prescribed dieting toward a community-and-coach model. OPTAVIA coaches earn 15% commission on product sales, with bonuses for recruiting additional coaches into the program. That's important context when evaluating the coaching relationship.
Is OPTAVIA the Same as Medifast?
OPTAVIA and Medifast are essentially the same program sold under different names. Both use very-low-calorie pre-packaged Fuelings, both target weight loss through caloric restriction, and both are owned by Medifast, Inc. The products share an identical macronutrient profile across the two brands.
The Medifast program from the 1990s was doctor-prescribed and clinic-based. OPTAVIA takes the same calorie-restriction approach but distributes it through independent coaches rather than medical offices. Consumers can now sign up online without a prescription. That's a meaningful structural shift, but the food is the same.
In fact, research published in peer-reviewed journals has studied both programs under the same umbrella precisely because the products and calorie targets are so similar. A randomized controlled trial confirmed that OPTAVIA and Medifast participants received the same Medifast Classic Fuelings during the study.
Key Similarities Between OPTAVIA and Medifast:
- Owned by the same parent company, Medifast, Inc.
- Pre-packaged Fuelings with identical macronutrient profiles
- Calorie restriction as the primary weight loss mechanism
- Multiple daily small meals (5-6 per day)
- Combination of purchased meals and one home-cooked 'Lean and Green' meal
What Are the Key Differences Between OPTAVIA and Medifast?
The biggest difference between OPTAVIA and Medifast is how each program is sold and supported. Medifast was historically sold through physician offices and company-owned weight-loss clinics. OPTAVIA operates through independent coaches who sell products and provide behavioural support.
Coaching intensity differs between the two programs as well. OPTAVIA places greater emphasis on one-on-one coaching calls and community support. Research comparing the two programs found that coaching contact was significantly associated with weight loss outcomes for OPTAVIA participants specifically.
The calorie plans also differ by program tier. OPTAVIA's 5&1 Plan targets 800 to 1,000 calories per day with 80 to 120 grams of protein. Medifast's 4&2&1 Plan is structured as a reduced-calorie self-guided option with less daily coaching contact and slightly more home-cooked meals.
OPTAVIA vs Medifast Comparison:
| Feature | OPTAVIA | Medifast |
|---|---|---|
| Launch year | 2017 | 1981 |
| Sales model | Independent coaches | Physicians and clinics |
| Flagship plan | 5&1 Plan (800-1,000 kcal/day) | 4&2&1 Plan (self-guided) |
| Coaching | High-touch 1:1 coaching | Self-directed with less support |
| Products | OPTAVIA Fuelings (no artificial additives) | Medifast Classic Fuelings |
| Parent company | Medifast, Inc. | Medifast, Inc. |
Did Medifast Change Its Name to OPTAVIA?
Medifast did not simply rename itself OPTAVIA. Medifast, Inc. is still the corporate entity, and it operates OPTAVIA as its consumer diet brand. Think of it as a company with multiple product lines. OPTAVIA is the brand Medifast, Inc. actively invests in and markets today.
The older Medifast consumer diet program that existed before 2017 has largely been phased out. Most people searching for Medifast today encounter OPTAVIA instead, since that is the program Medifast, Inc. actively promotes through its coach network.
Medifast still uses the Medifast Classic product line internally. A 16-week randomized controlled trial confirmed that both OPTAVIA and Medifast participants received the same Medifast Classic Fuelings, home-delivered monthly to participants in both program arms of the study.
How Do the Meal Plans Compare?
Both programs center on Fuelings, pre-packaged products that replace most daily meals. OPTAVIA currently offers over 60 Fueling options including shakes, bars, soups, puddings, and savory snacks. Each is fortified with added protein and a probiotic, with no artificial sweeteners, colors, or flavors.
Participants on either program eat five to six small meals per day. Most of these are Fuelings. The remaining meal, called the 'Lean and Green,' is prepared at home and must meet macronutrient targets set by the company, typically lean protein and non-starchy vegetables.
Neither program requires calorie counting or point tracking. The structure is built into the plan. So what is the catch? The limited food variety challenges many participants over time, and the dependence on processed convenience foods can become difficult to maintain long-term.
What Do You Eat on OPTAVIA?
On OPTAVIA's 5&1 Plan, a person eats five OPTAVIA Fuelings plus one Lean and Green meal daily. The Fuelings include products like buttermilk cheddar mac, red bean chili, chocolate shakes, and crunchy snacks. Each serving provides around 100 to 110 calories.
The Lean and Green meal is built around 5 to 7 ounces of lean protein such as chicken, fish, or eggs, combined with three servings of non-starchy vegetables. Healthy fats are allowed in limited quantities. The home-cooked meal typically falls between 250 and 400 calories.
OPTAVIA also offers the 4&2&1 Plan for those closer to their goal weight, which adds a second home-cooked meal per day. The OPTAVIA ACTIVE line includes amino acid blends and whey protein products for people who exercise regularly. The newer OPTAVIA ASCEND line is designed specifically for people using GLP-1 medications.
What Do You Eat on Medifast?
The Medifast 4&2&1 Plan uses four Fuelings, two Lean and Green meals, and one optional snack per day. This is positioned as a reduced-calorie self-guided option with slightly fewer Fuelings and more home-cooked meals compared to the OPTAVIA 5&1 Plan.
The actual Fueling products in both programs come from the same Medifast Classic line. A randomized controlled trial confirmed OPTAVIA and Medifast participants received the same products, home-delivered monthly. The difference was in plan structure and coaching support, not in the food itself.
Both programs restrict carbohydrates significantly. Calorie totals on Medifast plans tend to run higher than the OPTAVIA 5&1 Plan's 800 to 1,000 daily calories. Fruits, whole grains, and most dairy products are excluded from both programs during the active weight-loss phase.
How Much Does Each Program Cost?
OPTAVIA is not a cheap diet. The flagship 5&1 Plan costs more than $375 per month for Fuelings alone, not counting groceries for the daily Lean and Green meal prepared at home. First-month kits may be discounted, but regular pricing reflects an ongoing monthly product subscription.
The cost of coaching is bundled into the OPTAVIA coach relationship rather than charged separately. Coaches earn commissions from product purchases, so their support is incentivized by sales. This is worth considering when evaluating the objectivity of the advice clients receive from their assigned coach.
Medifast pricing varies by plan and purchase channel. The older clinic-based Medifast model carried physician consultation fees on top of product costs. OPTAVIA's direct-to-consumer model removes those clinic fees, but the monthly Fueling subscription remains the primary expense for either program.
Is OPTAVIA More Expensive Than Medifast?
OPTAVIA and Medifast are priced similarly because they use the same core Fueling products. The cost difference historically came from the Medifast clinic model, which added physician consultation fees on top of product costs. OPTAVIA's online model removes those clinical fees.
Both programs represent a significant monthly food budget. At over $375 per month just for Fuelings, OPTAVIA costs more than most single-adult grocery budgets. Add the weekly Lean and Green meal ingredients and total monthly diet costs climb higher.
Long-term cost is a meaningful concern. Many participants regain weight within one to two years of stopping either program. The bad news? The ongoing cost-to-benefit ratio deserves careful evaluation before committing to a multi-month subscription on either plan.
What Are the Side Effects of Both Programs?
Very-low-calorie diets like OPTAVIA and Medifast carry a risk of several documented side effects. The most common short-term complaints include digestive issues such as constipation, bloating, and nausea, which often occur as the body adjusts to drastically reduced calorie intake and limited fiber from whole foods.
Both programs limit entire food groups including most fruits, vegetables, and whole grains. These are among the most nutrient-dense foods available. Extended restriction of these food groups raises the risk of micronutrient deficiencies, particularly for participants who follow either program beyond the recommended short-term window.
Muscle loss is another documented concern. Very-low-calorie restriction causes the body to break down muscle tissue alongside fat for energy, particularly when carbohydrates are severely limited. Lower muscle mass reduces resting metabolic rate. Weight maintenance becomes harder after either program ends.
Documented Side Effects of OPTAVIA and Medifast:
- Insufficient daily calorie intake below recommended minimums for most adults
- Nutrient deficiencies from restricted food groups
- Muscle loss alongside fat loss due to very-low-calorie restriction
- Weight regain after stopping the program
- Digestive problems including constipation and bloating
- Risk of gallstones with rapid weight loss
- Elevated risk of disordered eating patterns with long-term use
Is OPTAVIA Safe for Long-Term Weight Loss?
OPTAVIA is not designed for indefinite use at its lowest calorie level. The 5&1 Plan at 800 to 1,000 calories per day sits below what most registered dietitians recommend for sustained nutrition. The program itself advises transitioning to a higher-calorie maintenance plan after the initial weight-loss phase.
A registered dietitian quoted in a major health publication put it plainly: since OPTAVIA is so low in calories, it leads to muscle loss rather than fat loss alone, which slows metabolism after the diet ends. People who see rapid weight loss as a positive may not account for this downstream metabolic effect.
The programs cite over 30 peer-reviewed publications. To be clear: most of this research comes from Medifast-funded or company-supported studies rather than large independent trials. Consulting a physician before starting either program is strongly recommended, particularly for anyone with existing health conditions.
Can OPTAVIA or Medifast Help You Lose Weight?
Yes. Both programs produce clinically significant weight loss in short-term studies. A review of randomized controlled trials found that participants on Medifast and OPTAVIA lost between 4.2 and 7.8 percent of their body weight after 12 months, outperforming participants on self-directed reduced-calorie diets.
Researchers at the Department of Scientific and Clinical Affairs found that among 124 adults randomized to either the Medifast or OPTAVIA programme, early weight loss at two and four weeks was the strongest predictor of achieving clinically meaningful weight reduction of 5% or more of total body weight. A 2026 study by Christopher D. Coleman analyzed these early weight loss factors across both commercial programmes, both of which included meal replacements and behavioural support.
A 16-week randomized controlled trial confirmed that both the Medifast and OPTAVIA programs outperformed a self-directed, reduced-calorie control diet for weight loss and body composition outcomes. Meal replacement use and coaching session adherence were the two factors most strongly associated with better results within each program.
Scientific References
- Christopher D. Coleman, 'Early Weight Loss and Other Factors Associated With Clinically Significant Weight Loss in Two Commercial Weight Loss Programmes,' Department of Scientific and Clinical Affairs, 2026. PMID 41074903.
Does the Weight Stay Off After Either Program?
Weight maintenance after OPTAVIA or Medifast is the most significant challenge both programs face. Short-term results are well-documented. Long-term data shows most participants regain weight within one to two years of stopping the structured plan.
The core issue is that neither program builds sustainable cooking habits or long-term calorie management skills. Participants rely on pre-packaged Fuelings for most meals. When the program ends and Fuelings are removed, many people lack the skills to replicate similar portion control with whole foods.
The reason is simple: weight lost rapidly on very-low-calorie programs often includes a significant amount of muscle mass alongside fat. Lower muscle mass lowers resting metabolic rate. Future weight maintenance becomes harder than it was before the diet started. That is the cycle our coaches at Optimal Weight Plan are specifically trained to break.
Is There a Cheaper WonderSlim Route to the Same Medifast-Style Fuelings?
Paying over $375 monthly for Fuelings is the price of either brand name. WonderSlim sells the same style of meal replacement, and this WonderSlim products review prices shakes near $2.14 per serving.
Want Your Free Weight Loss Action Plan from Our OPTAVIA Coaches?
You have the facts. OPTAVIA and Medifast work short-term, but most people need a structured plan to keep the weight off. That is exactly what our Independent OPTAVIA Coaches at Optimal Weight Plan provide. Not a kit. Not a subscription. A real plan built around your body, your schedule, and your goal.
Think of it this way: our coaches sit down with you, figure out which plan fits your lifestyle, and stay with you through the process. No guessing. No restarting the same cycle every few months. A structured 12-week protocol sent straight to your inbox when you book a free call with our coaches.
Don't keep restarting programs that leave you without a maintenance strategy. Our team at Optimal Weight Plan bridges the gap between the weight-loss phase and the habits that make results last. Get your free action plan today and start building a foundation that outlasts any packaged meal plan.
What Does the Optimal Weight Plan Program Include?
The Optimal Weight Plan program combines OPTAVIA coaching with a long-term habit-building framework. Our Independent OPTAVIA Coaches guide clients through the initial weight-loss phase and then transition them into a maintenance strategy designed to prevent the regain cycle that affects most short-term dieters.
Coaching through Optimal Weight Plan is personalized. Each client gets a dedicated coach who tracks progress, adjusts the plan as needed, and provides accountability through weekly check-ins. This coaching model is precisely what research identifies as the strongest predictor of better outcomes on OPTAVIA programs.
The program also addresses the transition off Fuelings, the step most programs skip entirely. Our coaches help clients build real-food habits that maintain the caloric targets established during the weight-loss phase, so the results they worked for do not disappear within six months of stopping.
