《北史·列传·卷七十八》
徐謇有一种饮食调养吞服的方法，年近八十，但鬓发不白，体力不减。
謇常有将饵及吞服道，年垂八十，而鬓发不白，力未多衰。
Xu Jian had a dietary and health-preserving method of swallowing, and although he was nearly eighty years old, his hair was not white and his strength did not wane.