It's an evolutionary mystery that scientists have had trouble explaining, but humans are the only animals who actually enjoy eating spicy food. There does not seem to be any health benefits to eating painful peppers (though some research finds that it may fight off fungus), so the best reason some have suggested is the thrill factor—no different than the fact that we are the only animals that like rollercoasters and scary movies. And for some great tips on healthy eating, this is the Single Best Weight-Loss Hack You Can Do.
As we get older, our brains tend to shrink and can suffer from cognitive dysfunction like Alzheimer's disease and dementia. But as best researchers can tell, we are the only animals to whom this shrinkage happens. Tests on other animals have found no similar phenomena—even close evolutionary relatives like chimpanzees and rhesus monkeys