the facts in the article can be interpreted in many ways.
Anyway, i was saying it based on my lifelong observations and personal experiences and understanding of how brain works. In short - i've never seen a fat mathematician :)
In my experience, it's not likely because they expend calories thinking, but that they get so emersed into their work, they forget to eat :) lot of good programming folks seem to be the same way
http://www.scientificamerican.com/article/thinking-hard-calo... seems to say, not really.