The Study
Thermogenesis in obese women: effect of fructose vs. glucose added to a meal.
This study showed that when these 23 women ate a meal with fructose instead of glucose, their bodies burned a little more energy for a few hours. But it didn't prove that eating fructose helps people lose weight or get healthier over time — it just saw a short-term change in how their bodies processed food.
Analysis score
Maximum 90 for a randomized controlled trial.
Where the score came from
Scientists gave women two different meals—one with fructose, one with glucose—and measured how much energy their bodies burned afterward.
Where does this study sit?
Reviews of RCTs (Meta-analyses)
Max 100Randomized Trials
Max 90Reviews of Cohort Studies
Max 85Cohort Studies
Max 72Reviews of Case-Control Studies
Max 63Case-Control Studies
Max 58Cross-Sectional & Case Series
Max 50Expert Opinion
Max 554 / 100
Quality score
Participants are randomly assigned to treatment or control groups, minimizing bias. The gold standard for testing whether an intervention causes an effect.
Key takeaways
Summary
Based on the study abstract and findings.
- 1The difference is small—about 1 extra calorie burned per 100 calories eaten—and unlikely to meaningfully affect weight loss in real life.
- 2Fructose made bodies burn 10.2% of the meal’s energy as heat (vs.
- 38.4% for glucose), turned 51g of carbs into fuel (vs.
- 441g for glucose), and used more carbs than fat for energy.
Score breakdown, methodology, conflicts of interest, evidence analysis & raw study data
Publication
Journal
The American journal of physiology
Year
1992
Authors
J. Schwarz, Y. Schutz, V. Piolino, H. Schneider, J. Felber, E. Jéquier
Related Content
Claims (5)
When obese and lean women eat a meal with 75 grams of fructose, their bodies burn 10.2% of the meal's energy as heat after eating, which is higher than the 8.4% burned after eating 75 grams of glucose.
When obese and lean women eat a meal containing 75 grams of fructose, their bodies use more carbohydrates and fewer fats for energy over the next six hours compared to when they eat 75 grams of glucose, as shown by a higher respiratory quotient.
When obese and lean women consume fructose or glucose, their bodies produce similar short-term increases in energy use and metabolic activity, meaning obesity does not reduce how the body responds to fructose.
When obese and lean women consume 75 grams of fructose, their bodies oxidize 25% more carbohydrates over six hours than when they consume 75 grams of glucose, with average oxidation rates of 51.1 grams versus 40.9 grams.
When obese and lean women consume 75 grams of fructose, their blood lactate levels rise more than when they consume 75 grams of glucose, but their blood glucose and insulin levels do not change significantly.
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.