Who Is This Guide For?
You read sports supplement labels and see maltodextrin everywhere -- in gainers, intra-workout drinks, even some protein powders. Online opinions range from "miracle fuel" to "worse than poison." This guide gives you a science-based overview so you can decide for yourself.
TL;DR
- Maltodextrin's glycaemic index is 85-105, often higher than table sugar (GI ~65)
- During and after training, high GI is desirable -- it accelerates glycogen recovery
- In everyday nutrition, high GI is undesirable -- risk of insulin resistance (Livesey et al., 2019)
- Recent studies point to effects on gut microbiome (Nickerson & McDonald, 2012)
- For most healthy athletes, maltodextrin is safe in a training context
- Diabetics, those with insulin resistance, and people with digestive issues should be cautious
Why Is Maltodextrin's GI So High?
The glycaemic index measures how quickly a food raises blood sugar. For comparison:
| Food | GI |
|---|---|
| Glucose (reference) | 100 |
| Maltodextrin | 85-105 |
| White bread | 75 |
| Table sugar | 65 |
| Oats | 55 |
| Lentils | 30 |
Surprisingly, maltodextrin has a higher GI than table sugar. The reason: table sugar (sucrose) consists of glucose and fructose, and fructose goes to the liver first without immediately raising blood sugar. Maltodextrin, however, is a pure glucose chain that is absorbed directly and rapidly (Hofman et al., 2016).
What Does This Mean for Your Body?
In a Training Context: It Is an Advantage
If you are training intensely for over 60 minutes, a rapid blood sugar rise is exactly what you need. Glycogen stores are depleting and the body needs fast energy replacement. Maltodextrin fulfils this role perfectly (Cermak & van Loon, 2013).
Post-workout, the quick insulin spike drives amino acid transport into muscle cells, accelerating recovery (Ivy et al., 2002).
Outside Training: It Is a Risk
Repeated high insulin spikes without physical exertion are one pathway to developing insulin resistance. A meta-analysis of 15 cohort studies showed that diets with a high glycaemic load are associated with a 33% higher risk of type 2 diabetes (Livesey et al., 2019).
This does not mean a single maltodextrin shake causes diabetes. But daily use without training adds unnecessary glycaemic load.
The Gut Health Question
One important but less-discussed topic is maltodextrin's effect on the gut microbiome.
Nickerson and McDonald (2012) found that maltodextrin promotes adhesion of certain pathogenic bacteria (such as adherent-invasive E. coli strains) to the intestinal wall. These findings are primarily from laboratory experiments and animal models, not human trials. But they suggest that constant maltodextrin consumption may affect gut barrier function.
Another study showed that maltodextrin reduces intestinal mucus production, which is an important protective layer against pathogens (Laudisi et al., 2019).
Practical takeaway: Moderate use around training is likely safe. Constant daily consumption in large quantities warrants caution.
Who Should Avoid Maltodextrin?
| Group | Recommendation | Alternative |
|---|---|---|
| Type 2 diabetics | Avoid | Cyclic dextrin, slow carbs |
| Insulin resistance / pre-diabetes | Avoid outside training | Oats, sweet potato powder |
| Crohn's disease / IBD | Consult a doctor | Rice starch |
| IBS (irritable bowel syndrome) | Start with very small doses | Small amounts of dextrose |
| Healthy athlete | Safe around training | -- |
| Keto dieters | Avoid (breaks ketosis) | MCT oil |
How to Minimise Risks
1. Use only around training -- 30 min before, during, 30 min after. Not as breakfast or a snack.
2. Combine with slow carbs -- add oats to slow absorption.
3. Do not exceed 60 g per hour -- this is the maximum oxidation rate via a single transport mechanism.
4. Add protein -- protein slows gastric emptying and reduces GI impact (Manders et al., 2006).
5. Listen to your body -- if you experience bloating, gas, or diarrhoea, reduce the dose.
Maltodextrin vs Sugar: Comparison
| Property | Maltodextrin | Table Sugar | Honey |
|---|---|---|---|
| GI | 85-105 | 65 | 58 |
| Taste | Neutral | Sweet | Very sweet |
| Calories (kcal/g) | 4 | 4 | 3.04 |
| Osmolality | Low | High | High |
| GI tolerance at high doses | Good | Poor | Poor |
| Best use | Sports drinks | Baking | Food |
Frequently Asked Questions
Is maltodextrin better than sugar?
"Better" depends on context. In a sports drink, yes -- lower osmolality means better GI tolerance and faster absorption. In everyday food, no -- the GI is higher and there is no nutritional value. Neither is a healthy calorie supplement.
Does maltodextrin cause bloating?
In some people, yes, especially in large amounts (over 40 g at once). This is more common when maltodextrin is consumed on an empty stomach without other nutrients. Adding protein and fat reduces this effect.
Can children use maltodextrin?
Maltodextrin is an ingredient in many foods (including infant formula) and is generally safe. However, concentrated sports supplements are not recommended for those under 16 without medical advice.
Is maltodextrin natural?
Technically yes -- it is produced from natural starch through an enzymatic process. But it is heavily processed and does not occur naturally in this form. "Natural" does not automatically mean "healthy."
Does maltodextrin break a fast?
Yes, immediately. It is a fast-absorbing carbohydrate that raises insulin instantly. If you practice intermittent fasting, use maltodextrin only during your eating window.
Can maltodextrin be used in baking?
Yes, the food industry uses it as a texture improver and bulking agent. But in home baking it offers no advantage over regular flour or sugar.
Local Context (Estonia)
Estonian food law requires manufacturers to list maltodextrin in the ingredients, but because it is not "sugar" in the chemical sense, it does not appear in the sugar line of nutritional information. This is somewhat misleading -- you get a rapid blood sugar spike, but you do not see it reflected in the sugar grams.
At MaxFit you will find both maltodextrin-containing products (gainers, intra-workout drinks) and low-GI alternatives. Check our carbohydrate category for a full overview.
References
1. Hofman DL, van Buul VJ, Brouns FJPH. (2016). Nutrition, health, and regulatory aspects of digestible maltodextrins. Critical Reviews in Food Science and Nutrition, 56(12), 2091-2100.
2. Cermak NM, van Loon LJC. (2013). The use of carbohydrates during exercise as an ergogenic aid. Sports Medicine, 43(11), 1139-1155.
3. Ivy JL, Goforth HW, Damon BM, McCauley TR, Parsons EC, Price TB. (2002). Early postexercise muscle glycogen recovery is enhanced with a carbohydrate-protein supplement. Journal of Applied Physiology, 93(4), 1337-1344.
4. Livesey G, Taylor R, Livesey HF, Buyken AE, Jenkins DJA, Augustin LSA, Sievenpiper JL, Barclay AW, Liu S, Wolever TMS, Willett WC, Brighenti F, Salas-Salvado J, Bjorck I, Rizkalla SW, Riccardi G, La Vecchia C, Ceriello A, Trichopoulou A, Poulsen S, Kendall CWC, Brand-Miller JC. (2019). Dietary glycemic index and load and the risk of type 2 diabetes: a systematic review and updated meta-analyses of prospective cohort studies. Nutrients, 11(6), 1280.
5. Nickerson KP, McDonald C. (2012). Crohn's disease-associated adherent-invasive Escherichia coli adhesion is enhanced by exposure to the ubiquitous dietary polysaccharide maltodextrin. PLoS ONE, 7(12), e52132.
6. Laudisi F, Di Fusco D, Dinallo V, Stolfi C, De Luca A, Marafini I, Fantini MC, Monteleone G. (2019). The food additive maltodextrin promotes endoplasmic reticulum stress-driven mucus depletion and exacerbates intestinal inflammation. Cellular and Molecular Gastroenterology and Hepatology, 7(2), 457-473.
7. Manders RJF, Koopman R, Sluijsmans WEM, van den Berg R, Verbeek K, Saris WHM, Wagenmakers AJM, van Loon LJC. (2006). Co-ingestion of a protein hydrolysate with or without additional leucine effectively reduces postprandial blood glucose excursions in type 2 diabetic men. Journal of Nutrition, 136(5), 1294-1299.
Summary
Maltodextrin is a tool, not a health food. In the right context -- intense training, endurance sports, post-workout recovery -- it is effective and safe. Outside training it is just a high-GI carbohydrate with no nutritional value. Do not let marketing language mislead you: if the label says "complex carbohydrate" but the ingredient is maltodextrin, keep in mind that it is not a slow carb.
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