A ketogenic diet is a very low-carb diet with numerous health benefits. Here are 16 healthy and nutritious foods you can eat on this diet. This naturally puts us in and out of ketosis cyclically, with ample nutrients. This is the diet I advocate in my practice, not because it helps with weight loss but because it reverses many disease states — even serious mental health conditions like psychosis and seizures. Weight loss is actually just a side effect of eating for health.