Is Maltodextrin Bad for You? What the Evidence Says
Last updated: August 2026
Maltodextrin is a carbohydrate made from starch, not a synthetic sugar, and the amount you get from it decides whether it matters at all. A few hundred milligrams bulking out a vitamin capsule is nutritionally irrelevant. Several grams in a sports drink or a keto labelled snack bar is real carbohydrate that will raise your blood glucose. The dose is the entire argument, and most articles on this subject skip it.
Key takeaways
- Maltodextrin is made by breaking down starch from maize, wheat, potato, rice or tapioca. It is a food ingredient, not a synthetic chemical.
- It contains no fructose at all, which matters because fructose is the sugar component most linked to liver fat.
- Its glycaemic index is high, but that figure comes from testing 50 grams of the isolated powder, not from the trace amounts used as a filler.
- There is no good human evidence that maltodextrin as a food additive causes fatty liver disease.
- It genuinely does count on keto and in carbohydrate counting for diabetes, and it can break a fast at gram level doses.
- The most legitimate open question is about the gut lining and microbiome, where early laboratory and animal work exists but human evidence does not yet.
- Rapid weight loss on keto or fasting can trigger noticeable hair shedding around two to three months later.
What is maltodextrin and where does it come from?
Maltodextrin is a white, almost tasteless powder produced by partially breaking down starch with heat, acids or enzymes, most often from maize in the United States and from wheat in Europe. The result is a chain of glucose units shorter than starch but longer than sugar, which is why it is classed as a polysaccharide rather than a sugar.
Manufacturers use it because it is cheap, dissolves easily, carries flavour and stops powders clumping. That is why it turns up in stock cubes, salad dressings, crisps, instant desserts, sweetener sachets, protein powders and the capsule shell of almost every supplement on the shelf.
The labelling consequence catches people out. Because its chains are longer than mono and disaccharides, maltodextrin generally does not appear in the of which sugars line on a UK nutrition panel, even though your body digests it into glucose. A product can be honestly labelled low in sugar and still be substantially maltodextrin.
Does maltodextrin really have a higher glycaemic index than sugar?
Maltodextrin does carry a high glycaemic index, commonly quoted between 85 and 105 depending on the grade, which is at or above pure glucose and well above table sugar at around 65. That comparison is accurate and it is also routinely misused, because glycaemic index says nothing about how much of the food you actually eat.
Glycaemic index is measured by giving someone 50 grams of available carbohydrate from the test substance. Nobody consumes 50 grams of maltodextrin from a vitamin tablet. Glycaemic load, which multiplies the index by the actual portion, is the number that describes what happens in your body, and for filler quantities it is close to zero.
| Where you find it | Typical amount | Does it matter? |
|---|---|---|
| Filler in a vitamin or medicine capsule | Milligrams to a fraction of a gram | No, for practically everyone |
| Anti caking agent in a sweetener sachet | Under 1 gram | Negligible, though it is why sachets are not truly zero calorie |
| Bulking agent in a keto or protein bar | Several grams | Yes, this is real carbohydrate and counts |
| Carbohydrate source in a sports drink or gel | 20 to 60 grams or more | Yes, and that is usually the intended point |
| Thickener in a sauce, dressing or crisp coating | Small but frequent | Only as part of a wider ultra processed pattern |
Does maltodextrin cause fatty liver?
There is no good human evidence that maltodextrin causes fatty liver disease, and the mechanism usually offered for it does not hold up. Liver fat accumulates because of sustained excess energy intake, alcohol, and to a lesser degree large habitual intakes of fructose, which is metabolised largely in the liver and bypasses normal fullness signals.
Maltodextrin is a pure glucose polymer. It contains no fructose whatsoever. On the specific pathway that connects sugary drinks to liver fat, maltodextrin is on the safer side of the comparison rather than the worse side, which is the exact opposite of what the original version of this page said.
That does not make it a health food. If maltodextrin arrives in your diet as part of a large volume of ultra processed snacks and drinks, the calories are real and so is the effect on your weight and your liver. The ingredient is a passenger there, not the driver. We set out what actually shifts liver fat in our guide to the fatty liver diet, and ranked the genuine dietary risks in foods bad for your liver.
Where maltodextrin genuinely does matter
Three groups have a real reason to look for maltodextrin on a label, and none of them are about detoxing. The common thread is that all three care about carbohydrate arriving quickly, either because it disrupts a target or because it is exactly what is wanted.
If you are managing diabetes or counting carbohydrate
Maltodextrin is fast absorbed carbohydrate and should be counted as such, which is a practical issue rather than a toxicity one. Because it often escapes the sugars line on the label, checking total carbohydrate and the ingredients list rather than the sugar figure gives you the accurate picture. Anyone adjusting insulin around food should raise this with their diabetes team rather than a blog.
If you are doing keto or low carbohydrate
Maltodextrin counts fully toward your carbohydrate total and there is a legitimate complaint to be made about products marketed as keto friendly that use it as a bulking agent. The fix is simply to read the ingredients list, since front of pack claims are not a reliable guide to what is inside.
If you are fasting
A capsule filler will not break a fast in any meaningful sense, but several grams in a flavoured electrolyte drink or a pre workout will provoke an insulin response. Match the strictness of your check to the strictness of your fast, and be aware that many products advertised as fasting safe still contain a gram or two.
Is there anything legitimate to worry about?
The most credible open question about maltodextrin is its effect on the gut, not the liver. Laboratory and animal studies have suggested that maltodextrin may alter the mucus layer of the intestine and make it easier for certain bacteria to adhere and form biofilms, with some of that work linked to inflammatory bowel disease research.
Two things need saying about that honestly. It is preliminary, largely in cell cultures and mice at concentrations that do not map neatly onto a human diet, and it has not been demonstrated to cause disease in people. It is also genuinely worth watching, and it is a far better reason to be thoughtful about heavily processed food than any liver claim on the internet.
| Claim about maltodextrin | Evidence strength |
|---|---|
| Raises blood glucose quickly at meaningful doses | Strong. Well established, and the reason athletes use it |
| Counts toward carbohydrate on keto and in diabetes | Strong. Simply what it is |
| Causes digestive upset in some people at high intakes | Moderate. Common with sports doses |
| Affects gut lining and microbiome | Limited. Cell and animal work only, not shown in humans |
| Causes fatty liver disease | None. No human evidence, and no fructose pathway |
| Is a synthetic or artificial chemical | None. It is processed starch from a food crop |
Coeliac disease and allergies. Maltodextrin made from wheat is processed so thoroughly that it is generally considered safe for people with coeliac disease, and under UK and EU rules wheat derived glucose syrups and maltodextrins are exempt from allergen labelling on that basis. If you react to maize, check the source, since maize is the most common origin outside Europe. As always, follow the advice of your own dietitian over a general article.
How to cut down on maltodextrin without becoming obsessive
The efficient move is to change the shape of your shopping rather than to hunt one ingredient across every label. Maltodextrin clusters in packaged, powdered and instant foods, so eating more food that never needed a thickener removes most of it without any label reading at all.
- Read the ingredients list, not the front of the pack. Keto friendly and low sugar are marketing terms. The ingredients list is regulated.
- Check total carbohydrate rather than the sugars line. This is where maltodextrin actually shows up.
- Do not bother policing capsule fillers. The quantities are too small to matter and the anxiety costs more than the carbohydrate.
- Keep it deliberately if you train hard. For long endurance sessions, rapidly absorbed carbohydrate is a feature, not a fault.
- Judge the whole food, not the one word. A snack is not healthy because maltodextrin is absent, and not poison because it is present.
The thing keto and fasting actually do to your hair
Rapid weight loss reliably triggers a diffuse shedding called telogen effluvium, and it typically appears two to three months after the change rather than during it. That delay is why so few people connect the two, and why the diet gets the credit for the weight while the hair loss feels like it came from nowhere.
The mechanism is a stress response in the hair cycle. A sharp calorie deficit, a sudden drop in protein intake, or low iron and zinc pushes a larger than normal share of follicles from the growing phase into the resting phase together, and they all shed at once when that phase ends. It is usually temporary and it usually recovers once eating stabilises.
What actually prevents it is unglamorous. Lose weight at a moderate pace of around half a kilo to a kilo a week, keep protein intake up rather than just cutting carbohydrate, and if you are a menstruating woman or have been vegetarian for years, ask your GP about checking ferritin and full blood count before reaching for supplements. Our guides to telogen effluvium triggers and recovery and telling normal shedding from the kind worth acting on go through the timeline in detail.
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Shop Grow Me shampooTo be clear about what this is and is not: Grow Me is a cosmetic shampoo. It cannot treat liver disease, it is not a substitute for eating enough protein and calories, and it is not a treatment for hair loss. If your hair is shedding heavily, the diet and any underlying deficiency are what need addressing first.
Speak to your GP before starting keto or extended fasting if you take insulin or other diabetes medication, are pregnant or breastfeeding, have liver or kidney disease, or have a history of disordered eating. If hair shedding lasts beyond six months, comes with patches, or comes with fatigue or unexplained weight change, get it looked at. This article is general information and not medical advice, and nothing here is a reason to stop a prescribed medicine.
Frequently asked questions
Is maltodextrin worse than sugar?
Maltodextrin raises blood glucose faster than table sugar because it is pure glucose chains, but it contains no fructose, which is the component most associated with liver fat. Neither is a health food, and the more useful question is how much total refined carbohydrate you are eating rather than which of the two is nominally worse.
Does maltodextrin break a fast?
Gram level amounts in a drink, powder or bar will raise insulin and break a fast in any strict sense, while the milligrams used as a filler in a capsule will not. If your fast is for weight management rather than a medical procedure, capsule fillers are not worth worrying about.
Is maltodextrin gluten free?
Maltodextrin is generally suitable for people with coeliac disease even when made from wheat, because processing removes gluten to a level assessed as safe, and UK and EU rules exempt it from allergen labelling on that basis. Anyone who is highly sensitive or unsure should check with their dietitian rather than relying on a general rule.
Why is maltodextrin in my zero calorie sweetener?
Maltodextrin is added to sweetener sachets and tubs as a bulking and anti caking agent, since the sweetener itself is used in quantities too tiny to pour. This is why such products contain a small number of calories and carbohydrates per serving despite being labelled as zero, a rounding allowance rather than a trick.
Does maltodextrin cause weight gain?
Maltodextrin contributes about four calories per gram like any digestible carbohydrate, so it adds to your intake but has no special fat storing property. Weight gain follows sustained excess energy across your whole diet, and foods heavy in maltodextrin are often easy to overeat, which is the real mechanism.
Is maltodextrin safe for children?
Maltodextrin is an approved food ingredient and is safe for children in the quantities found in normal food, including in some infant formulas. The relevant concern is not the ingredient itself but the type of food it tends to signal, since it clusters in highly processed snacks and drinks.
Do athletes actually benefit from maltodextrin?
Endurance athletes use maltodextrin deliberately because it is absorbed rapidly, is far less sweet than glucose and is gentler on the stomach at the high concentrations needed during long events. In that context the fast blood glucose rise that worries everyone else is precisely the intended effect.
Can maltodextrin upset your stomach?
Large doses can cause bloating, cramping or loose stools, which is common when people first use sports drinks or gels at full strength. Building up gradually and diluting more usually resolves it, and persistent symptoms after ordinary amounts of food are worth discussing with a GP rather than blaming on one ingredient.
The bottom line
Maltodextrin is processed starch, not a synthetic sugar, and it is not the reason anyone has a fatty liver. It is worth counting if you are doing keto, managing diabetes or fasting strictly, and it is worth ignoring in a capsule filler. If you want a rule that survives contact with reality: eat more food that never needed a thickener, and stop diagnosing your diet one ingredient at a time.
Watermans is a British hair care brand, vegan and made in the UK, with more than 5 million bottles sold since 2012. We write about diet where it genuinely touches hair, and we say so plainly when a popular claim does not stand up.
