Why too much sugar might hurt your brain
Could Alzheimer's disease be a maladaptation of an evolutionary survival pathway mediated by intracerebral fructose and uric acid metabolism?
Not medical advice. For informational purposes only. Always consult a healthcare professional. Terms
Your body has an old survival trick: when it sees fructose (from sugar), it slows down your metabolism and saves energy for your brain. But if you eat too much sugar all the time, this trick stays on too long and starts hurting your brain.
Surprising Findings
Fructose metabolism—not glucose—is the key trigger for a survival response that reduces brain energy use.
Most people assume glucose is the main driver of brain energy and metabolic issues; this flips it by identifying fructose as the hidden switch that puts the brain into energy-saving mode.
Practical Takeaways
Reduce added sugars, high-glycemic carbs (like white bread and pasta), and salty processed foods to potentially lower chronic activation of this survival pathway.
Not medical advice. For informational purposes only. Always consult a healthcare professional. Terms
Your body has an old survival trick: when it sees fructose (from sugar), it slows down your metabolism and saves energy for your brain. But if you eat too much sugar all the time, this trick stays on too long and starts hurting your brain.
Surprising Findings
Fructose metabolism—not glucose—is the key trigger for a survival response that reduces brain energy use.
Most people assume glucose is the main driver of brain energy and metabolic issues; this flips it by identifying fructose as the hidden switch that puts the brain into energy-saving mode.
Practical Takeaways
Reduce added sugars, high-glycemic carbs (like white bread and pasta), and salty processed foods to potentially lower chronic activation of this survival pathway.
Publication
Journal
The American journal of clinical nutrition
Year
2023
Authors
Richard J. Johnson, D. Tolan, D. Bredesen, M. Nagel, L. Sánchez-Lozada, M. Fini, Scott Burtis, M. Lanaspa, David Perlmutter
Related Content
Claims (6)
Human physiology is evolutionarily optimized to minimize energy expenditure during metabolic processes.
What used to help humans survive famines—slowing down metabolism and storing fat—might now be causing Alzheimer’s because we’re always eating sugar and never getting a break.
Eating too much sugar, white bread, or salty food might trick your body into thinking it’s starving, which could over time harm your brain and raise Alzheimer’s risk.
If this theory is right, cutting sugar or taking a pill that blocks fructose might help stop or slow Alzheimer’s—but we don’t know yet.
When your body detects low food supply, it switches to a survival mode by using fructose to slow down your metabolism and store energy, so your brain gets more sugar.