I feel better on IF than I did on high frequency eating. I used to get in these post-meal funks where my brain got foggy for awhile but that seldom if ever happens with the IF. Hunger really isn't a big deal for me. Every once in a while I'll get really hungry the last couple of hours before I eat but most of the time I'm fine.
Best of luck with your professor. Martin provides copious amounts of scientific literature on his blog and you can always search for abstracts yourself. As long as you go in with scientific research backing up your standpoint there isn't much the professor can do but disagree. Realize that his strong position is more likely due to his bloody pride than an actual fully developed scientific understanding. People hate to be wrong!