Dietary fructose and metabolic syndrome and diabetes.
Level 5 - mechanism / opinion, no new human data
Narrative review without systematic methodology or primary human trial data
PubMed 19403723 · doi:10.3945/jn.108.098020
What was done
This paper reviews evidence regarding the metabolic effects of dietary fructose compared to glucose and other carbohydrates in healthy individuals and subjects with diabetes, evaluating glycemic control, lipemia, energy intake, gout, and kidney stone risk.
What was found
Substitution of dietary fructose for other carbohydrates produced a 13% reduction in mean plasma glucose in patients with type 1 and type 2 diabetes. In one study of healthy men, day-long plasma triglycerides were 32% greater on a high-fructose diet than on a high-glucose diet. The review reports no convincing experimental evidence that fructose increases energy intake or accelerates protein glycation, though high intake is associated with increased risk of gout in men and kidney stones.
Why it matters
Although fructose causes lower postprandial glucose and insulin excursions, excessive intake elevates triglycerides and uric acid-related disease risk. The author cautions against adding large amounts of fructose to the diet while noting that whole fruit consumption is not a concern.
Limits
This is a narrative review with no systematic search criteria, meta-analytic pooling, or risk-of-bias assessment reported. Sample sizes and detailed demographic data for the referenced studies were omitted from the abstract.
Cited by
- supports Acute administration of fructose does not stimulate insulin secretion or immediately elevate blood glucose substantially in animals or humans.