The keto diet is actually known to benefit risk factors for cardiovascular disease. In a study of 83 obese individuals, a long-term keto diet significantly reduced triglycerides and LDL cholesterol and increased HDL cholesterol. In other words, the keto diet improved all measured cardiovascular disease risk factors. Don't be surprised if you've been following a keto diet and someone tells you your breath smells a little fruity or "off." This is actually a sign that you are in ketosis.