When I think about why I enjoy food so much, it's hard to describe why it makes me happy, especially when the sensation of taste is so temporary. But I know that it does. I think Keller has a pretty good handle on explaining it.
"When we eat together, when we set out to do so deliberately, life is better, no matter your circumstances. Whether it's a sad or difficult time, whether it's an ordinary-seeming day, or whether it's a time of celebration, our lives are enriched when we share meals together." - Thomas Keller
So there you have Keller's insight on why we find joy in food. The joy of it is in sharing it!