Research
Macro partitioning
Fructose ingestion acutely and robustly increases FGF21 blood levels in both mice and humans, whereas glucose causes only a modest and delayed increase, establishing a liver-brain feedback loop for sugar consumption regulation.
Eating fructose triggers a rapid spike in FGF21, a hormone that helps regulate sugar intake, while glucose has a much weaker effect. This suggests your body uses FGF21 to specifically manage fructose consumption.
GoodSupportsHIGH confidence
Within two hours after fructose ingestion, FGF21 concentrations raise 3.4-fold in humans (60) and after 1 hour in mice a 2-fold increase of FGF21 has been reported... Glucose led only to a modest and delayed increase in FGF21 levels in humans (60).
Why this rating
Supported by multiple human and mouse studies cited in the review.
Source
Fibroblast Growth Factor 21—Metabolic Role in Mice and Men
Harald Staiger et al. · Endocrine Reviews · 2017
DOI 10.1210/er.2017-00016
narrative_reviewCited 267×
Read the paper DOI resolved against Crossref · corpus check 2026-06-10
More from this paper
- Fibroblast Growth Factor 21 (FGF21) analogues improve plasma lipid profiles in humans but lack glucose-lowering efficacy in type-2 diabetic patients, contrasting with robust glucose and lipid improvements observed in mouse models.Good
- Elevated circulating FGF21 levels in humans are associated with obesity, insulin resistance, and metabolic syndrome, suggesting a state of 'FGF21 resistance' similar to insulin resistance.Good
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