Big Brain = Small Gut?

Ever had any scientific curiosity as to how it is we human primates with an enourmous Brain, can still have a BMR comparable to other primates? Well it may be because we have a relatively tiny stomach and digestive tract:

(The Expensive Tissue Hypothesis)

http://66.102.9.104/search?q=cache:LEyFJ-gGPxIJ:www.beyondveg.com/billings-t/comp-anat/comp-anat-4b.shtml+www.beyondveg.com+decrease+in+brain++size&hl=en