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The reason why the Natto Belt in Japan is short-lived is to do with other dietary practices in the region, such as high salt intake, and not directly related to their natto consumption.
For details, please watch this video.
However, the way they eat natto may contribute to it or at least reduce the effect of natto on their longevity. The fact that they eat natto with white rice and they eat many bowls of rice.
In fact, not only in the Natto Belt, many people in Japan are not optimizing their natto eating. Many people are consuming natto in ways that reduce its health benefits.
For details, please watch this video.
Most natto lovers don’t practice intermittent fasting, either. It is such a waste. You are missing the benefits of spermidine.
Not many people are aware of the relationship between natto and sleep, either. In fact, natto, sleep, and fasting all come together as a synergetic combination.
For details, please watch this video.