Does fructose make you gain weight? | Nutritionist explains| Myprotein
Aug 13, 2026
Does fructose make you gain weight?
A systematic review and meta-analysis examined what happens to body weight when people consume large amounts of fructose, including what happens when calories are kept the same versus when fructose adds extra calories to the diet.
In this video, expert nutritionist Dr Richie Kirwan breaks down the research on fructose, sugar, calories and weight gain to explain whether fructose itself causes fat gain or whether total calorie intake is the bigger factor.
Key Facts:
The systematic review included 31 calorie-matched trials involving 637 participants.
When fructose replaced other carbohydrates without increasing total calories, there was no significant increase in body weight.
The researchers also analysed 10 trials where large amounts of fructose were added on top of people's existing calorie intake.
In these higher-calorie diets, body weight increased by an average of around 0.53 kg.
The researchers concluded that this weight gain may have been caused by the additional calories rather than fructose itself.
The studies were generally small, relatively short and often of low methodological quality, so the findings should be interpreted with those limitations in mind.
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