Perhaps Too Practical

When looking at what I eat I guess I can conclude that I usually try and make 'rational choices'. Rational to me, means buying food that is practical, that I will get maximum utility out of, and that is on the more healthy side, and if not, then moderated portions of it. Anytime I go to a restaurant, I try and get smaller porttions, or food that will last as left overs. I always feel really guilty when I don't finish food that I, or someone else pays for, so I either feel the need to eat it all (which can be very bad) or take it home for later. I guess this can be looked at as a good thing in some ways. I like knowing that food isn't going to waste, into a garbage can to just rot away in a dump. I also like knowing that I am getting full value for what I paid for. Even beside buying food, I have always been a practical buyer. It is hard for me to go shopping for clothes or anything that isn't necessarily needed, because I feel like I could be spending my money on something more important. Usually social settings will change this thinking, for example going out to eat with other people. If I'm by myself, I'll opt to just eat whatever I have sitting in my house.
Keynesian economics looks down upon "hoarding" or saving for no intentional later use, but especially in this ecomomy, I find it hard to believe that people save there money with no reason behind it. Whether it is to save your self from extra uneeded calories, or saving a dollar by buying something only when it goes on sale, saving can be a rational choice too.