Whaddaya mean I have brain fog?
For years, researchers thought when we effected difficult tasks, we used more energy, so our brains would feel overloaded. (That’s why those same folks suggested we should imbibe sweets- a milk shake, pop, etc.- with REAL sugar- to revive our brain functionality. They hypothesized fatigue was related to a depletion of glucose in the brain. However, testing could not confirm this as the cause.)