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Fat Binders | What Are They? How Do They Work?

Introducing Fat Binders

Of course, no fat loss programme will work unless nutrition and exercise are at the forefront of your mind, however, if you commit and sacrifice to such a programme you may want to see if you can get a little more help in your fat loss journey. Fat binders are a new and interesting way of assisting your fight against fat, and this article will review how effective they may be in boost fat loss.

What Are Fat Binders?

It is first important to clarify that fat binders are not the same as fat burners. Fat burners are used to burn away fat which is absorbed into our body and stored. Instead, a fat binder works exclusively outside of your body (kind of). You see, the digestive tract which runs from your mouth to, well, your anus is considered external to the body.

Nutrients from food are absorbed along this tract and transferred to our body to use as required. Fat binders essentially aim to prevent fat being absorbed, and therefore cannot be stored. This is similar to fibre which assists excretion of waste products from the digestive system. Due to this failure to be absorbed into the body, this is why fat binders are considered a medical device product, rather than a supplement.

How Do Fat Binders Work?

The most important active ingredient in fat binders is the polysaccharide, chitosan (1). This carbohydrate molecule, consisting of both an acetylated and deacetylated unit of D-glucosamine, is formed from a naturally occurring derivative of glucose (called chitin) which is treated with an alkaline to make its most well-known dericative, chitosan. Interestingly, chitin itself is sourced from plants and is almost as abundant at cellulose (which constructs the cell walls of plants) (1). Commercial uses of chitosan do not stop with fat binders, however, and the substance has been used for wound healing to create an artificial skin, as a fungicide in cosmetics and even to make contact lenses (1).

The way chitosan assists fat storage is its ability to attach itself to fat in the stomach prior to digestion. When you consume it, chitosan dissolves in our stomach acids and, as an alkali compound then changes in a gel form (2). This form of fibre is different from other consumable forms because of its positive ionic charge, which allows it to bond with lipids and fats which are constructed of negative ions (4—6).

The high emulsification properties of chitosan (3) will then attach to fat droplets in the organs with the fat surfaces acting as a surfactant. This mass of chitosan and fat will then transfer to the intestines from the stomach. At this stage, chitosan will change the insoluble fat deposits into a form which cannot be broken down further by digestive enzymes. Fundamentally, the fat binder will entrap fat and protect against its absorption, allowing passage of these molecules out of the body (2).

Benefits Of Chitosan On Body Fat Loss

Primarily, evidence has been gained on animal models where rats were provided with a high-fat diet and the digestibility of the fats consumed was examined. One such study (7) took a group of fats on a high-fat diet which was supplemented with varying types of dietary fibres. After a two week diet period, the faeces of the animals were collected and of the 23 dietary fibres consumed, chitosan has a markedly increased level of fat excretion, and the results indicated that fat digestibility was reduced by 50% compared to the control. In other words, 50% of the fat consumed left the body without being absorbed.

One such study was a double-blinded, placebo-controlled randomised controlled trial (10). This study took a group of 134 overweight adults and provided them with 500mg chitosan tablets, six times per day. At the end of the study measurements were taken of body weight loss, fat mass, fat percentage and body composition index. In comparison to placebo, chitosan consumption showed a 2.8lb weight loss, 2.6lbs of which was fat mass. This would indicate a 78% greater loss of fat in the chitosan group. Additionally, this group showed a reduced body fat percentage and better improvements in body fat composition index.

Fat Binders Are More Than Just Chitosan

Of course, fat binders are constructed of more than just chitosan and evidence also suggests consumption of these tablets alongside other beneficial compounds.

Another 6-week study on obese adults used a randomised, double-blind, placebo-controlled trial to examine the effect of chitosan alongside other weight loss supplements (namely glucomannan, vitamin C and fenugreek) (11). These researchers found that the combination of these compounds resulted in statistically significant body weight and fat loss in adults, without a change in calories consumed. Where the placebo group lost no weight (0kg), the supplement group lost 2.3kg, and where the placebo group gained 0.2kg of fat, the supplement group lost 2kg of fat. This shows that despite some studies indicating a little effect on fat absorption, either alone or in combination with other compounds chitosan has a definite effect on fat loss.

Benefits Of Chitin On High Cholesterol

Other studies demonstrate that the benefit of fat binders is not exclusively for weight loss. An interesting study published in the Journal of the American College of Nutrition (12) measured the lipid content of both blood and faeces following consumption of chitosan. They found that serum (blood) high-density lipoprotein and cholesterol levels were significantly reduced and that despite the faecal fat content being unchanged, the researchers postulated this was due to a change in excretion of neutral steroids. This would indicate an anti-cholesterolaemic effect of using fat binders and positive benefits of cardiovascular health.

Another study (13) took 84 subjects with mild to moderately high cholesterol and gave them 1.2g per day of chitosan or a placebo. Their results indicated a significant reduction in total cholesterol compared to placebo, and in a subgroup of older individuals (60 years plus) showed further reductions in total and low-density lipoprotein cholesterol. This would again show the added health benefits of fat binders on improving cholesterol.

Take Home Message

Fat binders show very good evidence of benefits on improving fat absorption and as such fat storage, as well as potentially benefitting your cardiovascular health.


Our articles should be used for informational and educational purposes only and are not intended to be taken as medical advice. If you’re concerned, consult a health professional before taking dietary supplements or introducing any major changes to your diet.

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Faye Reid

Faye Reid

Writer and expert

Faye Reid has a Bachelor of Science in Sport and Exercise Physiology and a Master of Science in Exercise Physiology and Sports Nutrition. Faye has worked with numerous high-profile organisations, such as Men's Health, Sky Sports, Huddersfield Giants, Warrington Wolves, British Dressage and GB Rowing, providing her expert sports science support. Find out more about Faye's experience here: https://www.linkedin.com/in/faye-reid-8b619b122/. She puts her passion into practice as goal attack for her netball team, and in competitive event riding.

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