Why your brain might work better when you eat less
Caloric restriction, resting metabolic rate and cognitive performance in Non-obese adults: A post-hoc analysis from CALERIE study.
Not medical advice. For informational purposes only. Always consult a healthcare professional. Terms
Surprising Findings
Cognitive improvements occurred without weight loss or changes in physical activity.
Everyone assumes weight loss or exercise improves cognition—this study proves neither was necessary. Even with identical activity levels and no fat loss, people’s brains improved just by increasing RMR.
Practical Takeaways
Try a moderate, sustainable 20–25% calorie reduction for 6–12 months—not to lose weight, but to see if your focus, memory, or mental clarity improves.
Not medical advice. For informational purposes only. Always consult a healthcare professional. Terms
Surprising Findings
Cognitive improvements occurred without weight loss or changes in physical activity.
Everyone assumes weight loss or exercise improves cognition—this study proves neither was necessary. Even with identical activity levels and no fat loss, people’s brains improved just by increasing RMR.
Practical Takeaways
Try a moderate, sustainable 20–25% calorie reduction for 6–12 months—not to lose weight, but to see if your focus, memory, or mental clarity improves.
Publication
Journal
Journal of psychiatric research
Year
2020
Authors
R. Grigolon, E. Brietzke, A. Trevizol, R. McIntyre, R. Mansur
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Claims (6)
When two people consume the same net calorie deficit, their resting metabolic rates and hormone levels may differ depending on how much total energy they are expending through activity and metabolism.
In people who are not overweight, eating fewer calories does not lead to better thinking skills by changing how much energy they use in a day or how active they are, because those changes are not linked to thinking ability once their resting metabolism is taken into account.
In healthy adults who reduce their calorie intake over a long period, changes in the rate at which the body uses energy at rest are linked to changes in cognitive performance, even when total calorie burn and physical activity levels are accounted for.
When people eat fewer calories, their cognitive performance may change due to shifts in resting metabolic rate, not because of changes in their weight or body fat. The key factor appears to be how the body regulates energy use at rest.
In healthy adults between 21 and 50 years old, reducing calorie intake by 25% for two years is linked to modest improvements in memory and metabolic rate, even when body weight and total energy consumption do not change, which may indicate that changes in how the body uses energy influence cognitive function.