The keto diet is mainly used to reduce the frequency of epileptic seizures in children. It has been used for weight loss and achieves results short-term, in some cases. The long-term effects and safety are not really clear. But some side effects have been documented. They include: some nutritional deficiency because you are not eating a wide range of foods, kidney problems because there is such a thing as, ‘too much of a good thing!’ and the kidney struggles to metabolize all the protein in the diet, liver problems due to the high fat content of keto meals that the liver has to process, constipation because the keto diet is low on complex carbs like grains, mood swings etc. The news is really not fantastic! But hey! Let’s hear what Harvard has to say….

https://www.health.harvard.edu/staying-healthy/can-the-keto-diet-help-me-lose-weight