Researchers at Osaka Metropolitan University found that familiar and affordable foods can help create a society where people are healthier and less stressed. Japanese natto, which is made from softened soybeans that have been boiled or steam-fermented with a bacteria known as Bacillus subtilis var. natto, might be one example of such a food.

The study was published in the journal, 'Journal of Applied Microbiology'. The human stomach and intestines contain Bacillus subtilis var. natto, as do plants, animals, and soil. The Miyagino strain is used to produce the majority of the natto consumed in Japan. The lifespan of the host was examined using Caenorhabditis elegans worms by a research team at the Graduate School of Human Life and Ecology, under the direction of Professor Eriko Kage-Nakadai.