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Additionally, they are also good source of antioxidant vitamin-C (provide 21% of recommended daily levels per 100 g); consumption of foods rich in vitamin C helps the body develop resistance against infectious agents and scavenge harmful free radicals. 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.
Earth's crust is made up of several elements: oxygen, 47 percent; silicon, 27 percent; aluminum, 8 percent; iron, 5 percent; calcium, 4 percent; magnesium, potassium and sodium, 2 percent.