It provides almost 20 percent of the daily vitamin intake required, per serving, which is necessary for maintaining good health. It is also known to have all the positive nutrients needed for proper functioning of the human body according to USDA. Fresh tomato is very rich in potassium. 100 g contain 237 mg of potassium and just 5 mg of sodium. Potassium is an important component of cell and body fluids that helps controlling heart rate and blood pressure caused by sodium.