Poor people have always survived on carbs because they are 10 times cheaper than meat. Beans and potatoes used to be real cheap. I remember when hamburger went to 49¢ a pound and Lady Bid suggested that people should eat more cheese which went for twice that price. Oh well.
Cheap veggies now about $1/lb and cheap meat about $2/lb. Eggs readily at $2/dozen and milk at $4/lb.
Food is a bargain!