Lemons contain about 31 grams of Vitamin C, which is nearly double the amount of Vitamin C needed in your daily diet. Along with boosting immunity, this burst of Vitamin C can reduce your risk of stroke and heart disease with regular consumption. Lemon also contains a high level of dietary fiber, which can reduce risk factors for heart disease by lowering LDL or bad cholesterol. A surplus of cholesterol can lead to atherosclerosis, a hardening of the arteries within the heart.