My food contains glucose, the fuel that feeds the trillions of healthy cells in my body. But that glucose also feeds something else, zombie cells, old damaged cells that have lingered beyond their useful life. By spewing toxic sludge, these zombies infect other healthy cells, speeding up the aging process, everything from hair loss and wrinkles to the onset of arthritis, cancer, and dementia. But what scientists have realized is that when we fast and cut off the supply of glucose, that zombie army is starved of energy, which saps them of their power. When food is plentiful, our body stores excess energy in the form of fat under the skin and around the internal organs.
When food is scarce, that fat is sent to the liver where it's turned into an alternative fuel source called a ketone. And as these ketones which provide the emergency power source, not only for our bodies, but also our brains.
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