Whole grain is what you get after winnowing (getting rid of chaff). Afaik paleo excludes most grain (silly of course, as it's a great source of energy)

Gluten is not a form of carb, it's a protein

There are hundreds of "natural" (not bred by humans) species of potatoe in South America. They do not cause famines. A lack of potatoes because of monoculture and potatoe-diseases caused the famine