Sunflower seeds are rich in unsaturated fatty acids, of which linoleic acid, which is essential for human body, accounts for about 50% ~ 60%. We know that linoleic acid can not only reduce human serum cholesterol, but also inhibit the deposition of cholesterol in blood vessels. Therefore, we can prevent cardiovascular and cerebrovascular diseases by eating more sunflower seeds. Watermelon seeds are low in calories and will not have much impact on human intake, but their nutrition is not very rich compared with the other two kinds of melon seeds. Sunflower seeds have the highest calories, but they are also the most nutritious. Among them, polyunsaturated fatty acids can regulate the body's fat metabolism and lower cholesterol, and vitamin E rich in them can play an antioxidant role. It can be seen that sunflower seeds have high oil content.