Why eating less protein makes you snack more
Testing Protein Leverage in Lean Humans: A Randomised Controlled Experimental Study
Not medical advice. For informational purposes only. Always consult a healthcare professional. Terms
Surprising Findings
Increasing protein to 25% didn’t reduce calorie intake at all.
Most people assume more protein = less hunger = fewer calories. But this study shows the body has no mechanism to downregulate intake when protein is high—only when it’s low.
Practical Takeaways
Aim for at least 15–20% of your daily calories from protein—especially at breakfast—to prevent mid-morning snack cravings and overeating later.
Not medical advice. For informational purposes only. Always consult a healthcare professional. Terms
Surprising Findings
Increasing protein to 25% didn’t reduce calorie intake at all.
Most people assume more protein = less hunger = fewer calories. But this study shows the body has no mechanism to downregulate intake when protein is high—only when it’s low.
Practical Takeaways
Aim for at least 15–20% of your daily calories from protein—especially at breakfast—to prevent mid-morning snack cravings and overeating later.
Publication
Journal
PLoS ONE
Year
2011
Authors
A. Gosby, A. Conigrave, N. Lau, M. Iglesias, R. Hall, S. Jebb, J. Brand-Miller, I. Caterson, D. Raubenheimer, S. Simpson
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When people reduce the amount of protein in their diet to 10% of their total calories, they tend to eat more total calories without trying.
When people eat a diet with only 10% protein, they tend to consume more calories overall because they eat more savory snacks between meals, not because they eat larger meals. This suggests that lower protein levels may trigger more frequent eating starts, not reduced fullness.
When lean adults reduce their protein intake from 15% to 10% of their daily calories, they tend to eat about 12% more calories over four days, mostly by snacking more on savory foods, suggesting that lower protein levels may lead to increased overall food consumption.
When lean adults increase their protein intake from 15% to 25% of daily calories, they do not eat fewer total calories over four days, indicating that the body adjusts energy intake when protein is too low but not when protein is too high.
When people consume a diet with only 10% protein, they may eat more total calories, but their protein intake still remains lower than on higher-protein diets, suggesting the body does not fully adjust energy intake to restore protein levels.