From a small farm perspective........

Meat and veg are the easiest to produce. Fruits and nuts are long term investments but are also important for winter storage, esp apples and hazelnuts here in New England.

Grains. These are much more labor intensive. I would plant more nut trees before attempting grains for personal use. Would be beneficial for feeding poultry like chickens and turkeys though in a free range situation.
We grew potatoes this year. Easier than grain for our use ( vs. for poultry). Dig, sort, box, stack, and store for 6 months or more.

ps. A couple varieties are noted for lower G.I. , but as we know they are still potatoes packed with carbs, as well as good vitamins and minerals.