Ten Signs and Symptoms That You’re in Ketosis

6. Increased Focus and Energy

People often report brain fog, tiredness and feeling sick when first starting a very low-carb diet. This is termed the “low carb flu” or “keto flu.”

However, long-term ketogenic dieters often report increased focus and energy.

When you start a low-carb diet, your body must adapt to burning more fat for fuel, instead of carbs.

When you get into ketosis, a large part of the brain starts burning ketones instead of glucose. It can take a few days or weeks for this to start working properly.

Ketones are an extremely potent fuel source for the brain. They have even been tested in a medical setting to treat brain diseases and conditions such as concussion and memory loss (14, 15, 16).

Therefore, it comes as no surprise that long-term ketogenic dieters often report increased clarity and improved brain function (17, 18).

Eliminating carbs can also help control and stabilize blood sugar levels. This may further increase focus and improve brain function.

Bottom Line: Many long-term ketogenic dieters report improved brain function and more stable energy levels, likely due to the rise in ketones and more stable blood sugar levels.

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