Some people experience a collection of symptoms called the keto flu when they first adopt a low-carb diet. Switching to a very low-carb diet is a major change, and your body may need time to adapt to this new way of eating. For some people, this transition period can be especially difficult.
Signs of the keto flu may start popping up within the first few days of cutting back on carbs. Symptoms can range from mild to severe and vary from person to person.
Keto-flu may cause: