Nutrition & Supplementation Blood Sugar & Focus Cognitive Fuel & Nootropics Blood Sugar and Brain Fog: The Glycaemic Science of Mental Clarity June 18, 2026July 21, 2026 Nutrition & Supplementation, Blood Sugar & Focus, Cognitive Fuel & Nootropics Skip to article On this page 01Masthead 03Opening 04Mechanism 05Evidence 06Stakes 07Protocol 08Verdict 09Bibliography Reading 42% HPC · Science Deep Dive 5 April 2026 · revised 2026-04-05 Blood Sugar and Brain Fog: The Glycaemic Science of Mental Clarity. The brain burns a quarter of the body’s glucose but tolerates remarkably little variation in supply, and…