Mitch established a pattern by bringing food each tuesday why was this important?

Food is a motif that Mitch uses to connect his relationship with Morieto the past. The food that he brings for Morrie reminds Mitch of a better time when he was still passionate about ideas and Morrie was healthy. They used to have fine times eating together at Brandies. Even though Morrie can no longer consume solid food, Mitch bringsthe food anyway.