The keto diet changes the way your body converts food into energy. Eating a lot of fat and very few carbs puts you in ketosis, a metabolic state where your body burns fat instead of carbs for fuel. When your body is unable to get glucose from carbs, your liver converts fatty acids from your diet into ketones, an alternative source of energy. Burning ketones in place of glucose reduces inflammation and spurs weight loss.
I've always heard that the brain functions well on ketones. Gluconeogenisis typically reduces ketosis, though as well? This is the first time I've heard anyone say the brain can't use anything but glucose. I know there's *preferred* sources of fuel over others, but I was also fairly certain other sources were fine.. or humans might be in a bit of trouble.
Some people just cut out the bulk of carbohydrates from major sources like breads, pastas, and sodas, and these people are on a Low Carbohydrate plan. There isn't anything particularly strict about it, it's more about being mindful of overall carb intake, often without tracking. This can be a good place to test the waters of a keto diet, though many people on this kind of plan never get into ketosis without further restriction.
The ketogenic diet ” a high-fat and very low-carb eating plan ” can be tough to start. After all, it's likely a radical departure from the way you're eating now (a typical standard American diet is high in carbohydrates and processed foods). But many people are trying the keto diet, which puts your body in a state of ketosis. That's what happens when your body's carb-burning switch flips to a fat-burning one, a change that can cause weight loss and has even been credited with controlling diabetes. (1)
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