Junk food junkies who down excessive amounts of ultra-processed grub are putting their brains at risk — and increasing their odds of dying prematurely! That’s the finding of researchers led by Harvard University professor Mingyang Song, whose international team analyzed data from 115,000 people who stuffed their faces with industrially crafted products, such as cookies, doughnuts, potato chips, white bread, frozen meals and processed meats — including hot dogs and bacon. Experts say such foods, which often contain high amounts of fat, salt and/or sugar, are designed to trigger cravings — but a…