One sweats after having a meal. This is because the circulation of qi of the body becomes active. Strong seasoning, especially hot and spicy foods make the body hot and sweat a lot. This suggests that the taste of foods itself contains the element to move qi.
Young people need and are able to absorb such movement of qi, so they tend to love well-seasoned foods, on the other hand, old people tend to take simple flavoring. This suggests one aspect of "good medicine tastes bitter".
*This article is translated from "Yamai hitokuchi Memo" written by Shoji Kobayashi, 2005.