The Study
The effect of high fructose corn syrup on the plasma insulin and leptin concentration, body weight gain and fat accumulation in rat.
This study looked at what happens to rats when they eat different kinds of sugar — it found that rats eating HFCS or regular sugar gained similar amounts of weight. But it doesn't prove that the same thing happens in people — it's just a clue from rats.
Analysis score
Maximum 72 for a cohort study.
Where the score came from
Scientists fed rats sugar or HFCS and saw they both made them gain the same amount of weight and fat, even when they ate the same calories.
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 510 / 100
Quality score
Groups of people are followed over time to see who develops an outcome. Strong for identifying risk factors and associations, but cannot prove causation as firmly as RCTs.
Key takeaways
Summary
Based on the study abstract and findings.
- 1This suggests sugar and HFCS may make your body store fat more efficiently than whole foods — even if you don’t eat more calories.
- 2Rats on sugar or HFCS gained more weight per calorie than rats on whole grains.
- 3Sugar made leptin levels 360 ng/mL, HFCS made them 230 ng/mL — both higher than control.
Score breakdown, methodology, conflicts of interest, evidence analysis & raw study data
Publication
Journal
Advances in clinical and experimental medicine : official organ Wroclaw Medical University
Year
2019
Authors
J. Sadowska, Magda Rygielska
Related Content
Claims (5)
When male Wistar rats were fed diets containing 10% sucrose or 10% high fructose corn syrup, their fasting insulin levels and insulin resistance measures remained unchanged compared to rats fed a whole grain diet.
Male Wistar rats fed diets with 10% sucrose or 10% high fructose corn syrup gained more weight and more weight per unit of energy consumed than rats fed a whole grain diet, showing that simple sugars lead to greater fat storage than expected from calories alone.
Male Wistar rats fed a diet with 10% sucrose had higher plasma leptin levels than rats fed a diet with 10% high fructose corn syrup, even though both groups gained the same amount of body weight.
When male Wistar rats consume equal calories from either sucrose or high fructose corn syrup, both sugars cause the same amount of weight gain and fat buildup around organs, showing that the chemical type of sugar affects how efficiently energy is stored, regardless of total calories.
Male Wistar rats fed a diet with 10% sucrose had higher plasma leptin levels than rats fed a diet with 10% high fructose corn syrup, even though both groups gained the same amount of weight.
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.