@okkiedot My question exactly! :)
Although this post did prompt my curiosity enough to make me google a few items and indeed it does look like being overweight is not good for the brain.
http://www.dailymail.co.uk/health/article-3686878/Are-fat-people-intelligent-People-overweight-make-wrong-food-choices-grey-white-matter-brain.html
And I also found this one on Steemit that actually discusses how fat is really expelled from the body. I never knew that. So in any event thank you @amnasheikh for the post and prompting me to educate myself :) !