Do men usually send pictures of the food to the woman they're dating (picture of the food that she cooked and sent him home)? Any reason for that?

When the man I'm dating come over for dinner, I usually send him home with leftovers. When he is eating it the next day or another day the leftover, he either tells me or he takes a picture and send it to me.

Why is that? Just to show that he is actually eating it? If he sends me home with food, I thank him, but don't do that. Does man usually do that?