Japanese high school girls don’t so much eat square meals as they just eat…whatever pops into their head at the moment. Sometimes it’s pan (bread of some kind), or ice cream. Or a parfait. The point is, on the whole, they like sweets. But they are also concerned with caloric intake. This segment just drives that point home. That, and Mayu seems to know what Morita-san is trying to say without actually having to hear the words.