Optislim vs Optifast: Discover Which Works Better in 2021 | Fintys (2022)

You started your diet on Monday, but tomorrow is Thursday and you already feel you’ve got no more ideas for further quick meal preparations. Not to mention that you’ve got millions of tasks and chores left unticked on your monthly to-do-list… So what do you do?

You either grab a coffee and a sweet, but stocked with calories, pastry during break hours or you may consider a pick-up-and-go meal replacement that will satisfy your hunger while assisting your weight-loss plan.

If you’re one of the many busy people who are looking forward to kick-starting weight loss by reducing calories, the Optislim and Optifast weight loss programs based on meal replacement shakes might be a good choice for you.

These dietary products are sold online, through retail shops or in health stores.

In order to fit the multitude of dietary needs and preferences, the meal supplement shakes of Optislim and Optifast contain a satisfactory amount of calories in a single take, fueled up with either protein, fibre as well as vitamins and minerals.

The most recognized product of the Optislim and the Optifast programs are the meal replacement shakes which are easy to use and simple to prepare and pack. They come in a variety of flavours such as banana, mocha, salty caramel, cookies, etc. which makes them a tasty alternative to regular meals.

In other words, Optislim and Optifast weight-loss products are a healthy, portable convenient choice for a diet on the go. Even more, they may prevent any temptation over fast food during high levels of hunger and also keep you satiable for several hours.

Though based on meal replacement shakes, Optislim and Optifast are weight loss programs that differ in many aspects. Buyers might notice an evident competition between these two brands when considering to implement them in their weight loss plan.

Each program has advantages and disadvantages, so it is advisable to inform yourself first before making a final choice and purchasing the products.

Here is a comparative overview of the Optislim and Optifast programs:

Table of Contents


What is Optislim?


Optislim is a top-rated Australian wellness program that is designed for rapid loss of excess weight.

It is designed to support the process of weight loss and weight management by providing a Very Low-Calorie Diet (VLCD) and Low-Calorie Diet (LCD) meal replacements in a range of shakes, soups, and bars full of essential vitamins and minerals.

The Optislim VLCD Meal Replacement Shakes may provide the daily recommended intake of 25 vitamins and minerals when consumed three times a day. Each box contains 21 sachets with a flavour of either vanilla, banana, coffee, chocolate or strawberry.

Optislim is a cost-effective way that will provide you with a steady weight loss. All food replacements come in different flavours or in assorted packages.

Optislim’s most recognized products are VLCD Meal Replacement Shakes, Healthy Option meals, weight loss capsules, and detox products.

Each product is a nutritionally balanced but low in calories and fat.

What Is Optifast?


(Video) Banana Optislim VLCD and Life Shake Range, and how do they rate next to Optifast?

Optifast is a regimented program for rapid weight loss that includes shakes for weight loss that may replace 1 to 3 regular meals, according to an individual lifestyle plan.

The Optifast is a VLCD Program, meaning a very-low-calorie diet for severely overweight and obese people but also for people who want to speed up their weight loss through a ketogenic, i.e. low-carbohydrate diet.

The main highlights of the Optifast program are the Optifast VLCD Protein shakes in different flavours as well as the desserts, soups, and bars that provide satiety and maintain lean muscles while the body is in a state of ketosis-meaning it burns fat for energy instead of carbohydrates.

Despite the low-calorie diet, Optifast contains the essential amount of vitamins and minerals as well as protein, fatty acids, and carbohydrates that provide rapid loss of weight but balanced body functions.

The Optifast program is divided into four levels: Active Weight Loss Level, Intensive Level, and Maintainance level. Each stage has Optifast shakes, snacks, desserts, soups and bars that ought to provide the necessary daily intake of vitamins and minerals and trace elements.

The Active Weight Loss Level 1 is compromised of twelve to sixteen weeks of total meal replacement with the Optifast products. Fast-forward to the Transition Level of four to six weeks of slow returning to prepared meals and lastly, the Maintainance phase which balances the use of meal preparations and prepared meals.

The Optifast VLCD Intensive level included allows you to enter and proceed with mild ketosis by replacing up to 3 meals per day with the dietary products offered in the weight loss program.

The products also follow the Codex Alimentarius International Standards for VLCD/VLED.

Moreover, Optisfast is a medically supervised program with the support of health professionals who help their clients through monitoring, counselling, and classes, aiming toward a healthy lifestyle with positive eating habits and balanced weight.

Optislim vs Optifast

If you are in doubt about whether you should choose Optifast or Optislim for your diet based on a meal replacement plan, you should initially consider the cost-effectiveness of both of these programs as well their results in terms of weight loss and the possible long-term maintenance of the effects.

Both Optifast and Optislim are similar because they offer meal replacement products with essential nutritional value. However, Optislim limits its offer to meal replacements that promote weight loss whereas Optifast offers a medically supervised program.

Having in mind that calorie-restricted diets may harm a person’s health if taken without medical consultation and assessment, Optifast may be a preferable weight loss program due to the higher level of safety provided by the monitoring and assistance of health professionals included.

On the other hand, however, the Optislim Meal Replacement Shake is more cost-effective as the product contains 21 sachets vs 18 sachets of the Optifast Meal Replacement Shake per box.

(Video) Optifast Protein Shake | Weight Loss Journey | Michelle Yemoh

In addition, when it comes to lifestyle and personal schedule, it can be said that Optifast may be quite a time consuming dietary solution for many since it involves monitoring, classes, reports, and counselling. If you opt for Optifast, be ready to incorporate another task in your busy routine.

If this sounds too demanding, then maybe you should consider Optislim as a more convenient dietary method. However, Optislim does not offer any support during weight loss nor step by step introduction toward weight maintenance and long-term healthy eating habits.

Although users of both Optislim and Optifast have confirmed losing weight through weight loss shakes and other dietary meal replacements included in the programs, Optifast holds an advantageous position in terms of maintenance of lost weight.

Optislim will induce weight loss through low-calorie meal replacements that provide quick results. The results may be fast achieved but hard to maintain in the long run since calorie-restricted diets are often draining and harmful to health.

The regimented program of Optifast, on the other hand, includes a maintenance phase as the last and longest phase of the program, where you would attend support sessions to consolidate your newly learned positive eating habits and thus, sustain your weight and figure.

Moreover, you can buy Optifast online at Chemist Warehouse or at clinics, hospitals and at certain doctor’s offices. You can order and purchase Optislim only in Australia through eBay or its official website.

Are They Good for Weight Loss?

Optislim vs Optifast: Discover Which Works Better in 2021 | Fintys (3)

Both Optislim and Optifast may make you lose weight rapidly. However, dieticians and health professionals are adamant to advise that diets with meal replacements are only a step toward your goal of losing and maintaining your ideal weight, but not a permanent solution.

The best long-term wellness results are obtained through a calorie-controlled diet and regular exercise.

If you want to lose weight through VLCD or diet loss shakes you must, above all, consult your doctor or health care provider before you decide upon taking up any fitness program or product.

Very low-calorie diets or weight loss programs based on diet shakes have a general lack of nutrition and practitioners often face exhausting hunger, fatigue and other side effects such as headaches, constipation, dry mouth, dizziness, and hair thinning.

In addition, scientific research by dieticians has shown that meal replacements, in general, cannot guarantee to provide all the necessary trace elements and nutrients that can be obtained through high-calorie meals.


Why Is Optifast More Expensive Than Optislim?

When considering Optifast vs Optisilm you may wonder why the dietary program of Optifast is a more expensive one.

The main distinguishing aspect of these programs is that although both of them offer a wide range of dietary products, Optifast is also a medically supervised program that offers three stages of dieting and weight management between 26 and 52 weeks, followed and monitored by health professionals.

(Video) VLCD Optislim & Optifast Bar/snack range ( Australia)

Optislim is a weight loss program that is mainly focused on rapid loss shakes but it does not include medical assistance during the process of weight loss nor professional dietary counselling that may help you maintain balanced, healthy body weight and positive eating habits.

Are Optifast and Optislim Gluten Free?

All the OptiFast VLCD products contain a certain level of lactose and soy-based ingredients. Potential consumers with Coeliac Disease or gluten intolerance should have in mind that the OptiFast VLCD Chocolate, Cappuccino Flavour & Berry Crunch Flavour Bars are made of ingredients that contain processed oats. So, although these bars are not made with ingredients that contain gluten, they may still be unsuitable for the gluten- intolerant.

OptiFast shakes, desserts, and soups are similarly made of ingredients containing egg. Optifast Bars are also products that may contain pine nuts and peanuts.

Although Optislim is not a brand that offers a variety of gluten-free products, its OptiSlim VLCD Platinum Plus Meal Replacement Shake is a gluten-free friendly weight-loss shake, and one of the few suitable gluten-free options from this brand. Moreover, this is one of the rapid loss shakes that contain only natural colours and flavours and a mix of prebiotics and probiotics.

The Bottom Line

Losing excess body weight through diet shakes and dietary meal replacements may be a practical solution when you want to get rid of extra pounds and fat in a quick way.

Both Optifast and Optislim are convenient dietary programs that offer portable, nutritional meals that can provide a long-term diet regime on the go.

These programs offer effective weight loss plans in the shortest plausible time-frame of 2- 6 weeks. However, Optifast may be considered as a rather preferable choice for consumers due to its medically supervised plan and counselling during the process of losing weight.

Though Optislim is also an effective program, it is focused solely on meal replacements in the range of shakes, bars, and soups. For some people, Optislim may be a better option since it does not include diligent counselling, monitoring or classes.

Regardless of your personal choice when you opt for one of these dietary programs, you should always keep in mind that before starting off any of the VLCD diets, you should consult your doctor or health care professional in order to secure your safety and wellbeing.

Finally, VLCD and LCD programs and methods may help you to make the first step toward fighting obesity or excess body weight. When supported by assisting medical guidance, VLCD and LCD programs focused on meal supplements can be an effective and healthy way of losing weight.

However, the old golden rule of healthy, nutritional and balanced meals accompanied by regular exercise remains to be the best long-term solution to ideal body weight and figure.

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Which is more effective Optifast or Optislim? ›

Hi, The only difference between optislim and optifast is the price and taste. Other than that there really is no difference. Optislim offer a better variety with shakes, bars ect!

What diet shake is the most effective? ›

The 12 Best Meal Replacement Shakes For Weight Loss, According To Nutritionists
  • Plant-Based Protein Shake Evolve. ...
  • Grass-Fed Clean Protein Shake Orgain. ...
  • Grass-Fed Protein Drink ICONIC. ...
  • Plant-Based Dark Chocolate Protein Drink OWYN. ...
  • Advanced Nutrition Meal Replacement Shake SlimFast. ...
  • Max Protein Nutrition Shake Ensure.
Jun 30, 2022

Has anyone lost weight with Optislim? ›

Generally, when you are on the Optislim meal replacement program, you can expect to lose about 1 kg a week. This can be more or less depending on a few factors including your starting weight, age, metabolism, medical conditions, exercise routine and the number of meals you are replacing.

How much can you lose on Optifast in 3 months? ›

Very low calorie diets, such as the Intensive Level of the OPTIFAST VLCD Program, have been shown to be very effective in helping people lose weight. During ketosis, when replacing all 3 meals each day over a period of up to 3 months, weekly weight losses can average about 1-2.5kg per week1,2.

How much can you lose on Optifast in 2 weeks? ›

To facilitate this weight loss, we recommend that you follow the Optifast Meal Plan for 2 weeks before surgery. The meal plan is a very-low-calorie-diet designed to produce rapid weight loss of around 1.5-2.5kg per week.

How much weight can I lose on Optifast in 4 weeks? ›

Research using Very low calorie diets (also known as VLEDs or Very Low Energy Diets) have shown on average, weekly weight losses of approximately 1.0-2.5kg per week4, providing greater initial weight loss than other forms of calorie restriction.

Which protein shake is best for belly fat loss? ›

Whey protein is a type of protein powder made from milk. It's one of the best sources of protein for weight loss and can help you lose belly fat specifically.

What shake is comparable to optifast? ›

Medifast Overview

Just like Optifast, Medifast is another leading band of meal replacements. But what sets it apart is that Medifast does not require medical supervision while on the program and also serves a more targeted population that do not specifically struggle with obesity unlike Optifast does.

What is the best protein shake to lose weight? ›

Best protein shake for weight loss
  • Decathlon Isolate Whey Protein. The overall best protein shake for losing weight. ...
  • Bulk Gourmet Vegan Protein. ...
  • Innermost The Strong Protein. ...
  • Protein Works Diet Meal Replacement Extreme. ...
  • PE Nutrition Performance Lean. ...
  • Form Peakblend. ...
  • Bulk Pure Whey Isolate. ...
  • PhD Diet Whey.

How much weight can you lose on Optislim in a month? ›

Generally, when you are on the Optislim meal replacement program, you can expect lose about 1 kg a week, more or less depending on the above factors.

How long should you use Optislim for? ›

What is the OptiSlim weight loss program? OptiSlim serves up a four-week weight loss program which requires participants to take up the LCD or VLCD approach for 28 days. During this time, you'll need to replace three meals with a mix of various shakes, soups and snacks from the relevant Optislim range.

Is Optislim full of sugar? ›

The IsoWhey blend is higher in fibre and protein than most, and fortified with a wide range of minerals and vitamins, as well as enzymes, prebiotics and probiotics.
Shake it off! The down low with weight loss shakes.
Product (Chocolate varieties)Amount of Sugar
Optislim VLCD14.2g
Celebrity Slim24.6g
Tony Fergusson Classic8.1g
2 more rows
Apr 14, 2016

Why do doctors recommend OPTIFAST? ›

The OPTIFAST VLCD Program is a very low-calorie diet (VLCD) designed to help people who are obese or severely overweight. A VLCD is described as a 'low carbohydrate, total diet replacement for the dietary management of obesity'. It's also sometimes referred to as VLEDs (Very Low Energy Diets).

What is the fastest way to lose weight on OPTIFAST? ›

For fast weight loss, you can choose to replace 3 meals each day with OPTIFAST VLCD products. This is the 'Intensive Level' and is the 'very low calorie diet' component of the Program, which has been shown to be safe and effective.

Why have I stopped losing weight on OPTIFAST? ›

One possible reason for a plateau is that your body has adjusted to the reduced calories and is using food more efficiently. This is the physical reason why weight loss has slowed or stopped. Another reason may be that you have made a very subtle change in your food plan.

How can I lose 5kg in 2 weeks? ›

Do physical activities like walking, jogging, sprinting or swimming for 150-250 minutes per week to prevent weight gain. Try high-intensity interval training (HIIT) to maximise calorie and fat burn. Eat more soluble fibre and less refined or processed foods. Limit daily snacking.

Can you have 4 OPTIFAST shakes a day? ›

How do I take Optifast? Make sure you have 4 Optifast packets each day. Do not drink less than 4 Optifast a day as this can result in muscle loss and poor healing after surgery.

Can I eat eggs on OPTIFAST? ›

If you must eat something other than just the vegetables or salad, skip the OPTIFAST VLCD product for that meal and opt for a small portion of protein such as 100g meat or chicken, some fish or eggs and load up your plate with a garden salad or some low starch vegetables.

How long can I stay on OPTIFAST? ›

It is a total diet replacement providing less than 800 calories per day. This level is designed to achieve a large initial weight loss whilst helping to preserve lean body mass. You can stay on this level for anywhere up to 12 weeks, however, this period is variable and depends on your weight loss goals.

Can OPTIFAST cause weight gain? ›

Weight gain is another risk associated with Optifast: As the study in ​Diabetes Spectrum​ notes, meal replacement products and diets have limitations. "A vital part of a comprehensive weight management program is learning to recognize and eat smaller portions at meals and snacks.

Can you eat fruit on OPTIFAST? ›

Fruit is not recommended during the Intensive Level of the OPTIFAST VLCD Program. Fruit is naturally high in sugar and in order for the body to start burning fat via ketosis it is best to avoid fruit as this can deter the ketosis process and compromise weight loss.

What is the best protein shake for weight loss in Australia? ›

Weight Loss Shake Comparison
ALDI Slim & Trim Chocolate Shake2.3g18.2g
Optifast VLCD Chocolate Flavour Pack4.5g20g
Nature's Way SlimRight Chocolate 375g<1g6.2g
FatBlaster Ultimate Chocolate Shake 50% Low Sugar1.9g6.3g
2 more rows

What burns the most visceral fat? ›

Regular aerobic exercise is a great way to shed visceral fat. It's commonly known as cardio, and it burns a lot of calories. In fact, many studies have shown that aerobic exercise can help you lose visceral fat, even without dieting ( 18 , 19 , 20 , 21 ).

What happens if you drink protein shakes without working out? ›

In short, if you drink a protein shake on a rest day, or a day when you're doing less than you might usually do, there's no need to worry about any adverse effects. However, if you're drinking high protein shakes on their own and not to supplement your protein intake when working out, this could cause weight gain.

Who should not use Optifast? ›

Precautions. The Intensive Level of the OPTIFAST VLCD Program is generally not advised for use in persons over the age of 65 years. Older people (aged > 70 years) have increased protein requirements due to an elevated anabolic resistance to ingested protein8.

What are the side effects of taking Optifast? ›

The most common side effects include fatigue (tiredness), nausea (upset stomach), constipation and diarrhea. These side effects can be treated with lifestyle changes or over-the-counter medicines.

Is Slimfast as good as Optifast? ›

According to MayoClinic.com, Slim Fast is a meal-replacement diet in which followers consume purchased weight-management products in place of one or two meals a day. While Optifast also involves meal replacement, it is primarily a very low-calorie diet with intake restricted to between 400 and 800 calories daily.

What is the difference between Optifast and Slim Fast? ›

According to MayoClinic.com, Slim Fast is a meal-replacement diet in which followers consume purchased weight-management products in place of one or two meals a day. While Optifast also involves meal replacement, it is primarily a very low-calorie diet with intake restricted to between 400 and 800 calories daily.

What are the side effects of Optifast? ›

The most common side effects include fatigue (tiredness), nausea (upset stomach), constipation and diarrhea. These side effects can be treated with lifestyle changes or over-the-counter medicines.

What is the difference between OptiSlim and OptiSlim platinum? ›

Optislim VLCD is mixed with water and the Platinum is mixed with skim milk. The Platinum range also contains additional ingredients to further assist with your weight loss. These include Glucomannan to help keep you fuller, Ginseng to help with your energy levels and Green Coffee Extract to help with fat burning.

What foods can you eat on OptiSlim? ›

Low starch and green vegetablesasparagus beans broccoli celery cabbage capsicum carrots
Soupsstock cubes (in moderation)
Sauces and condimentslemon juice vinegar
Spices and herbschili cinnamon cloves coriander cumin curry powder
3 more rows


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