Four centuries ago, the people living in Osaka left behind an unlikely record of what they ate. It was not written in a cookbook or preserved in a market ledger, but in the hardened deposits that accumulated on their teeth.

Nearly 400 years ago, people living in Osaka had no refrigerators, supermarkets or modern food supply chains. Yet an unusual scientific discovery suggests that their diets were…

Four centuries ago, the people living in Osaka left behind an unlikely record of what they ate. It was not written in a cookbook or preserved in a market ledger, but in the…