The Claim
In healthy young adults, short-term overfeeding reduces gut transit time compared to underfeeding and control diets, and this reduction is associated with altered fecal serotonin and Bacteroides levels.
What the research says
Supports is higher
Support is ahead, but a single strong opposing study can change this.
These are independent scores, not a percentage. Higher-grade studies count more, so a single strong opposing study can outweigh several weaker ones.
When healthy young adults eat more calories than needed for a short time, food moves through their digestive tract faster, and this is linked to changes in fecal serotonin and Bacteroides bacteria levels.
See the scientific wording
In healthy young adults, short-term overfeeding reduces gut transit time compared to underfeeding and control diets, and this change is associated with altered fecal serotonin and Bacteroides levels, suggesting a potential link between dietary energy load, gut motility, and microbial metabolism.
When a person eats more food than usual, the gut moves contents faster, which changes the types of bacteria present. Fewer Bacteroides bacteria mean less of an enzyme that breaks down a serotonin precursor, so less serotonin ends up in the stool. This drop in stool serotonin is linked to faster movement of food through the gut.
What the research says
1 studyWhen healthy young adults ate more than usual for a week, their food moved through their gut faster, and their poop had less serotonin and different gut bacteria—exactly what the claim said.
Score breakdown, mechanism chain, raw evidence, ideal studies needed & 1 supporting studies
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.