Article: Is Maltodextrin Bad for You? What the Evidence Says
Is Maltodextrin Bad for You? What the Evidence Says
Maltodextrin is a starch based carbohydrate produced by breaking down corn, wheat, rice or potato starch into short chains of glucose. It is a food ingredient rather than a sweetener or an artificial chemical, it contains roughly four calories per gram like any other carbohydrate, and it raises blood glucose quickly. It is not uniquely harmful to the liver, but it is a fast carbohydrate hiding in products people assume are low in sugar.
Key takeaways
- It is a carbohydrate made from ordinary starch, not a synthetic additive and not a sugar substitute.
- It raises blood glucose fast, with a glycaemic index typically quoted between 85 and 105, above table sugar at about 65.
- The claim that it specifically causes fatty liver does not hold up. Excess energy from any source is what drives that.
- It breaks a fast. It is a carbohydrate with calories, so it triggers an insulin response.
- It matters most for people managing blood glucose, and for anyone eating a lot of powdered or ultra-processed food without realising it is in there.
What is maltodextrin and where does it come from?
Maltodextrin is made by hydrolysing starch, using enzymes or acid to cut long starch molecules into shorter glucose chains. The result sits between starch and glucose on the scale of how broken down it is, measured by something called the dextrose equivalent. In the UK and Europe the starch usually comes from wheat or potato; in the US it is almost always corn.
It exists because it is extremely useful to manufacturers. It is cheap, it dissolves easily, it has almost no taste, and it does three jobs at once: bulking out a powder, carrying flavour and preventing caking. That is why it turns up in sports drinks, protein powders, instant soups, salad dressings, sauces, sweeteners sold in sachets, crisps and a great many supplements.
Why it is not listed under sugars
On a UK nutrition label it counts towards total carbohydrate but not towards 'of which sugars', because its glucose chains are longer than the single and double sugars that definition covers. A product can therefore read 0.5g sugar while being substantially made of a fast-digesting carbohydrate.
Does it really have a higher glycaemic index than sugar?
Yes, and this is the one popular claim that holds up. Maltodextrin is typically quoted with a glycaemic index between 85 and 105, while table sugar sits around 65. The reason is straightforward: sucrose is half glucose and half fructose, and fructose is handled by the liver rather than entering the bloodstream as glucose. These chains are pure glucose, so essentially all of it arrives as blood sugar.
| Carbohydrate | Approximate GI | What it is made of |
|---|---|---|
| Glucose | 100 | Single glucose molecules, the reference point |
| Maltodextrin | 85 to 105 | Short chains of glucose only |
| White bread | 70 to 75 | Starch, digested to glucose |
| Table sugar (sucrose) | about 65 | Half glucose, half fructose |
| Fructose | about 19 | Handled largely by the liver, not the bloodstream |
Two things stop that number meaning as much as it first appears. Glycaemic index is measured on a 50g dose of the carbohydrate eaten alone, and almost nobody eats it that way. Eaten inside a soup or a dressing alongside fat, protein and fibre, the real blood glucose response is considerably flatter. The British Dietetic Association makes the same point about GI generally: it describes an isolated food, not a meal.
The exception is a drink. A liquid carbohydrate with no fat, protein or fibre to slow it down does produce close to the isolated response, which is precisely why endurance athletes use it during events and why it is a poor thing to be drinking casually at a desk.
Does maltodextrin cause fatty liver?
No good evidence shows that maltodextrin specifically causes fatty liver. The claim circulating online conflates it with fructose, which is a genuinely different molecule handled by a different pathway. Fructose is metabolised almost entirely in the liver and, in large sustained amounts, does promote fat production there. Glucose is used by every tissue in the body, and these chains are glucose.
What does drive non-alcoholic fatty liver disease is a sustained energy surplus, alongside excess alcohol, insulin resistance and central weight gain. A diet heavy in ultra-processed food will very often contain this ingredient, so it is a reasonable marker of that kind of diet. Being a marker is not the same as being a cause, and a claim that a single ingredient is the hidden culprit is almost always a sign that something is being sold.
Where the confusion comes from
High fructose corn syrup and maltodextrin are both made from corn starch, sit next to each other on ingredient lists, and get discussed interchangeably online. They are not the same. One is roughly half fructose; the other contains none at all. Almost every liver claim you will read applies to the first and has been transplanted onto the second.
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Where does it genuinely matter?
It genuinely matters in three situations, and being clear about them is more useful than a blanket warning. The first is blood glucose management: for anyone with type 1 or type 2 diabetes, a fast glucose source hidden in a low-sugar-labelled product is a practical problem, and Diabetes UK's guidance on glycaemic index is worth reading alongside your own monitoring.
The second is fasting. It is a carbohydrate with calories, so it will raise insulin and end a fasted state. Instant coffees, electrolyte sachets, sugar-free sweetener sachets and flavoured supplements marketed as fasting-friendly frequently contain it, and that is one of the more common ways people unknowingly break a fast they are working hard to keep.
The third is coeliac disease. Most commercial supply in Europe is wheat derived, and although processing removes gluten to below the legal threshold so it is generally considered safe, the wheat origin must be declared on the label under UK allergen rules. Anyone who reacts to trace amounts should check the source rather than assume.
There is also a legitimate use worth naming, because the ingredient is not a villain. During endurance exercise lasting more than about 90 minutes, a fast-absorbing glucose source is exactly what the body needs, and it is easier on the stomach than a concentrated sugar drink. Context decides.
Is there anything else legitimate to worry about?
The gut microbiome question is the one open area worth mentioning honestly. Some laboratory and animal research suggests it may alter the behaviour of certain gut bacteria and affect the mucus layer of the intestine, with the work most often cited relating to inflammatory bowel conditions. That work is early, largely not in humans, and uses doses that do not map neatly onto a normal diet.
The honest position is that this is a plausible area of ongoing research rather than an established risk, and researchers in the field disagree about how much the animal findings translate. It would be overstating the evidence to tell you it damages your gut, and it would be dismissive to pretend the question has been settled. Both things are true at once.
How do you cut down without becoming obsessive?
You cut down most effectively by changing a handful of repeated purchases rather than auditing every label. Three or four swaps in the things you buy weekly remove far more than reading every ingredient list in the shop, and they are sustainable in a way that vigilance is not.
- Check powders first. Protein powders, pre-workouts, electrolyte sachets and instant drinks are where the highest proportions sit.
- Buy sauces and dressings with short ingredient lists, or make the simple ones. Vinaigrette is oil, vinegar and mustard.
- Watch the sweetener sachets. Many tabletop sweeteners are mostly bulking carbohydrate with a tiny amount of the actual sweetener.
- Ignore it on a label when it is fifth or later in the list of a food you eat occasionally. Position in the list reflects quantity, and chasing trace amounts is effort that would be better spent elsewhere.
How much of it is actually in everyday products?
Quantity is the part almost every article skips, and it is the part that decides whether any of this matters to you. Ingredient lists in the UK are ordered by weight, so position tells you more than presence does. An ingredient listed second in a sports drink powder is most of what you are drinking; the same word listed eighth in a jar of sauce is a fraction of a gram per serving.
| Product | Typical position on the list | Roughly what that means per serving |
|---|---|---|
| Sports or endurance drink powder | First or second | The bulk of the carbohydrate, often 20g to 40g per scoop |
| Tabletop sweetener sachet | First | Nearly the whole sachet, though a sachet is only about 1g |
| Flavoured protein powder | Third to sixth | A few grams per scoop, used to carry flavour and stop caking |
| Instant soup or gravy granules | Second to fourth | Several grams per portion, mainly as a thickener |
| Crisps and savoury snacks | Fifth or later | Well under a gram, part of the seasoning blend |
| Bottled dressing or sauce | Fifth or later | Typically under a gram per tablespoon |
Read that table as a priority order rather than a blacklist. Dropping one daily sports drink removes more of it from your week than eliminating every sauce, dressing and packet of crisps in the cupboard, and it takes one decision instead of a permanent habit of label-reading. That is the difference between a change you keep and one you abandon in a fortnight.
A sugar-free label is not a low-carbohydrate label
The two get read as the same thing and they are not. A product can be honestly labelled sugar-free, contain no sucrose, fructose or lactose at all, and still be mostly fast-digesting carbohydrate. If blood glucose is what you are managing, the total carbohydrate figure is the number to read, not the sugars line beneath it.
What do keto and fasting actually do to your hair?
Rapid weight loss and prolonged energy restriction can trigger hair shedding roughly three months later, whichever diet produced them. The mechanism is not specific to keto or to fasting: a sharp drop in energy intake, protein or iron pushes a larger than usual share of follicles into the resting phase, and they release together a season afterwards. This is the pattern how telogen effluvium shedding works describes.
The three hair problems get muddled here, so it is worth separating them. Hair shedding is what dieting causes: whole hairs releasing from the follicle with a small white bulb at the root, diffusely across the scalp, and it recovers once intake steadies. Hair loss is the follicle itself miniaturising or being attacked, as in pattern hair loss, and diet does not cause it. Hair breakage is the fibre snapping mid-length, which comes from heat, bleach and tension rather than from food. why hair starts thinning helps if you are not sure which you are seeing.
Two practical points if you are losing weight deliberately. Keep protein intake up rather than letting it fall alongside calories, and have ferritin checked if shedding starts, because iron stores drop quickly on a restricted diet and low ferritin is one of the most common correctable causes. what to do about heavy shedding covers the rest, and if you are considering supplements, whether biotin supplements are safe for your liver is worth reading first.
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Frequently asked questions
Is maltodextrin a sugar?
Not by the labelling definition. It is a chain of glucose units, longer than the single and double sugars that 'of which sugars' covers, so it counts as carbohydrate instead. Your body still digests it to glucose.
Does it break a fast?
Yes. It contains roughly four calories per gram and raises insulin, so any amount worth mentioning ends a fasted state. Check electrolyte and instant coffee sachets if you are fasting seriously.
Is it keto friendly?
No. It is a pure glucose carbohydrate with a high glycaemic index, which is close to the opposite of what a ketogenic diet is trying to achieve.
Is it safe for coeliacs?
Generally yes, even when wheat derived, because processing takes gluten below the legal threshold. UK allergen rules require the wheat origin to be declared, so check the label if you react to traces.
Is it worse than sugar?
It has a higher glycaemic index, but sugar brings fructose, which the liver handles differently. Neither is good in quantity, and framing it as a contest is less useful than looking at how much of either you eat.
Does it cause weight gain?
Only in the way any calorie source does. It is not more fattening per calorie, though its low satiety and presence in easy-to-overconsume drinks make it easy to take in more than you intended.
Why is it in my sugar-free sweetener?
It bulks the sachet out. Intense sweeteners are effective in milligram amounts, so a carbohydrate carrier is added to make a spoonful of powder measurable.
Should I avoid it completely?
For most people, no. Cutting the powders and drinks where it appears in quantity captures nearly all the benefit; chasing trace amounts in the occasional sauce is effort with very little return.
What is the bottom line on maltodextrin?
The bottom line on maltodextrin is that it is a fast carbohydrate hiding in plain sight, not a toxin. It is made from ordinary starch, it raises blood glucose quickly, and it does not appear under 'of which sugars' on a label, which is exactly why people are surprised to find it. The fatty liver claim belongs to fructose and has been borrowed. Where it genuinely warrants attention is in blood glucose management, in anything you are drinking during a fast, and in the powders and instant products where it makes up a real share of the contents. Change those few purchases and ignore the trace amounts.
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