I'm sure it depends on the person, to some degree. The fact that many in this country get way overweight eating stuff they buy in a drive-through at a fast-food emporium tells you it isn't all presentation (unless you have a real thing for paper bags and styrofoam shells). But for me, it definitely does increase on a good presentation. But it is very individual, to me. I've been to restaurants where the presentation was everything, and very geometric, and I felt like I had to knock down a tower of food with fancy squiggles of sauce decorating the plate (not sure how you're supposed to taste it), and it pretty much equaled eating out of a fast food paper bag, at a gazillion times the price. BUT, give me a beautifully presented dish of food that was meant to be eaten, and yes, I will definitely be more hungry for it, no matter the price.