The ketogenic diet is often criticized for being high in cholesterol and saturated fat, which can increase the risk of heart disease. However, research has shown that a ketogenic diet can actually improve cholesterol levels by increasing HDL (the "good"...MásThe ketogenic diet is often criticized for being high in cholesterol and saturated fat, which can increase the risk of heart disease. However, research has shown that a ketogenic diet can actually improve cholesterol levels by increasing HDL (the "good" cholesterol) and decreasing triglycerides (a type of fat in the blood).