Talking about calcium-rich food, natto is another plant-based calcium source. Not as much as Japanese mustard spinach, yet, it is high in calcium, as well as magnesium and vitamin K. Magnesium supports the absorption of calcium and Vitamin K supports osteocalcin which helps calcium become bones.
Okra is also high in calcium and Hijiki is high in magnesium.
Therefore, Okra Hijiki Natto is a super nutritious dish.
The Ikigai Diet: The Secret Japanese Diet to Health and Longevity