In the first few days of the keto diet, it's not uncommon for people to experience the "keto flu," a brief period in which you may have headaches, fatigue, confusion, and nausea. These symptoms are a sign that your body is making the switch from burning glucose (sugar from carbs) for energy to burning fat—a process called ketosis. The changeover can leave you feeling depleted for a day or two, but once you break through to the fat-burning phase, you may find you have much more energy and greater endurance. "You are able to do more without hitting 'the wall,' says Carrie Burrows, PhD, a health and fitness expert. "When we use fat as fuel, our endurance improves and is more sustainable." That extra energy will carry over to your workouts, Dr. Burrows says. Here are more things you need to know before starting the keto diet.
In addition to helping you lose weight, ketosis may also increase your energy, improve your concentration, decrease inflammation and improve your blood sugar markers, reducing your risk of developing diabetes. A study published in the journal Seizure in 2014 also linked ketosis to reduced severity and frequency of seizures in those with epilepsy and a slower progression of Alzheimer's disease.
In addition to helping you lose weight, ketosis may also increase your energy, improve your concentration, decrease inflammation and improve your blood sugar markers, reducing your risk of developing diabetes. A study published in the journal Seizure in 2014 also linked ketosis to reduced severity and frequency of seizures in those with epilepsy and a slower progression of Alzheimer's disease.

As per heartburn, studies done have shown that a ketogenic diet can have beneficial effects for those who have Non Alcoholic Fatty Liver Disease. A 2006 paper published in the Journal of Digestive Diseases and Sciences found that ‘Six months of a low-carbohydrate, ketogenic diet led to significant weight loss and histologic improvement of fatty liver disease’
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