Supplements · Diets
Can the sweetener allulose give you diarrhea?
The claim, precisely: allulose causes osmotic diarrhea
Strong support Supplements
RefutedContestedStrong support
consensus score 1.00
Yes — but only at large doses; the small amounts used for blood sugar are well tolerated.
Evidence ladder
How far up the ladder this claim has climbed. A high consensus on a low rung means "consistent so far," not "proven in people."
Top evidence so far: Human trials (RCT / n-of-1)
MechanismIn-vitroAnimalObservationalRCTMeta-analysis
How the studies fall
4 support 0 contradict 0 tested null 0 mixed · 3 sources, 3 independent groups
What the evidence shows
Allulose causes dose-dependent osmotic diarrhea above ~0.4 g/kg single dose (~28 g for a 70 kg adult); effective glycemic doses (5-10 g) are comfortably below the threshold. Well-tolerated at food-relevant doses.
The evidence (4)
| Source | Grade | Stance | Quality | Finding |
|---|---|---|---|---|
| (tolerance trial) 2018 · Nutrients | RCT | supports | moderate | Tolerance trial: no severe GI up to 0.4 g/kg; severe diarrhea at 0.5 g/kg single dose |
| Risso 2024 2024 · Food Funct | RCT | supports | moderate | [FT-verified] Risso 2024 RCT children 2.5/4.3g well-tolerated only 1 loose stool; confirms threshold |
| Iida 2010 2010 · Metabolism | observational | supports | moderate | [FT-verified] Iida 2010 psicose ~70% renally excreted poorly fermented; osmotic-laxation basis at high dose |
| (tolerance trial) 2018 · Nutrients | RCT | supports | moderate | GI-tolerance trial severe diarrhea at 0.5 g/kg single dose; tolerated <=0.4 g/kg max daily 0.9 |
Educational only, not medical advice. Grades and scores reflect published evidence weighted by study design and quality; see the methodology.