This traditional Japanese food made from fermented soybeans is an acquired taste but offers a varied nutrient profile that includes vitamin K2. Postmenopausal women may need to increase their vitamin K intake to maintain bone density and prevent osteoporosis. One cup of natto provides about half the DRI of vitamin K on a 2000 calorie diet. It has a substantial amount of protein and minerals, as well, including manganese, iron, copper, magnesium, calcium, potassium, zinc, phosphorus, and selenium. Natto also contains vitamins B6 and C, folate, riboflavin, and thiamin.
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