Helps treats type 2 diabetes, Boosts immunity Supports, Weight loss, Reduces Inflammation, Ability to reduce the risk of Cancer, Lowers Blood Pressure Prevents Arthritis, Reduces Cardiovascular risk. Researchers believe olive leaf can have positive effects on atherosclerosis, or narrowing of the arteries, which is the highest risk factor for heart disease. high levels of LDL, or “bad” cholesterol, and total cholesterol are risk factors for developing this disease.