I'm aware of several stereotypical categories of backpacker, such as those mentioned already above, but I'm not sure there is any strong correlation between those stereotypes and a stereotypical set of food choices. Food choices, in my experience, are very individual and only loosely associated with one's backpacking experience level or preferred style of backpacking.

For example, most thru-hikers share a similar drive to hike big miles and similar devotion to cutting grams, but while some eat Ho-Hos and other junk food, others will carefully home-dehydrate and package vegan meals to be sent ahead to drop points as they hike.

Good luck with your research, though.