I think African populations that eat a lot of sorghum don't suffer the way wheat-eating populations do. Lack of gluten is a plus, but I hesitate to call any flour "healthy" since it's dense energy used for celebratory/dessert foods. My policy is that if the price of the flour matters then I'm probably using it too frequently so I splurge on fancy ones like chestnut.
Lots of: urban hiking, cycling, sprinting
Lots of: fresh meat, seafood, eggs, organs, tubers, starchy fruits, low-energy plants, meat fat, dairy fat, oily fruits
Some: cured meat, dairy protein, sweet fruits, rice, peas, tree nuts, oily seeds
Minimal: soy, refined proteins, sugar, liquid carbohydrate, grains, beans, refined oils, peanuts