Signs you're in ketosis without testing

People often report brain fog, tiredness, and feeling sick when starting a very low carb diet. This is termed the “low carb flu” or “keto flu” (16).

However, long-term keto 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 (17).

Ketones are an extremely potent fuel source for your brain. They have even been tested in a medical setting to treat brain diseases and conditions such as concussion and memory loss (18, 19, 20, 21).

Eliminating carbs can also help control and stabilize blood sugar levels.

This may further increase focus and improve brain function (22, ).

The initial switch to a keto diet can be one of the biggest issues for new dieters. Well-known side effects can include weakness and fatigue (16).

These often cause people to quit the d

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