06/03/2026
Like every other cell in the body, the cells that make up the human brain require an adequate and steady supply of energy to function optimally.
When the brain exists in a chronic low-energy state, many brain cells begin to die, while the surviving ones operate far below their full capacity.
The consequences gradually show up as memory loss, mental fog, cognitive decline, dementia, and even Alzheimer’s disease.
So what creates this persistent low-energy environment in the brain?
Two major culprits stand out:
1. Insulin Resistance
2. Loss of Metabolic Flexibility
When insulin resistance develops in the brain, brain cells lose efficient access to glucose, one of their primary energy sources. The result is a state of chronic energy deprivation.
At the same time, loss of metabolic flexibility means the brain cannot easily switch to fat (ketones) as an alternative fuel.
In simple terms, the brain becomes unable to effectively use both of its major energy sources, even when they are available.
This is why individuals who are insulin resistant, pre-diabetic, or living with type 2 diabetes have a significantly higher risk of developing conditions linked to chronic brain energy deficiency.
The encouraging news is this:
Preventing and reversing insulin resistance is one of the most powerful ways to protect the brain and reduce the risk of cognitive decline.
Your brain doesn’t just need oxygen.
It needs energy. And metabolic health determines whether it gets it.
