Lemon, like any other citrus fruit, is excellent source of vitamin C, providing 64% of recommended daily intake in a 100g (3,5oz) serving. Lemons are a good source of dietary fiber, and contain no saturated fats and cholesterol.
According to American Heart Association, high intake of citrus fruits may lower the risk of ischemic stroke for women. The natural antioxidant - vitamin C, helps reduce cancer risk by fighting formation of free radicals.