We always hear that many people don't do well on less than 50 g of carbs. Long term it isn't optimal to always be in ketosis. Many people need more than 50 g of carbs for proper thyroid function, etc....
So, since potatos can be inflammatory and insulinnogenic and many paleo authors recommend against them....
and no grains/rice are paleo in the sense of them being around in the paleolithic ...
and between 50-100 g of fruit per day is both hard to do logistically everyday and it is a lot of fructose
and green veggies dont really add up to much carbs at all
and squash, pumpkin, etc. seem like more "rare" foods to me,
What am I missing here?
Well the Hadza right now eat about 10 different types of tubers that the women dig out of the ground with sticks. They then roast them and chew up the flesh and spit out a fibrous quid. They also eat baobab and berries of various types. It's thought that the species of plants and animals that they consume are largely similar to those consumed by the first anatomically modern humans in their region tens of thousands of years ago.
As you move away from the tropics, it becomes increasingly difficult to get a lot of carbs year-round. That means that these populations likely have a greater tolerance for carbohydrate reduction, but they nevertheless have roughly the same requirements for glucose by their brains and red blood cells and for muscle glycogen repletion. The adaptations are probably along the lines of a more robust liver with a greater expression of ketogenic and glucogenic enzymes.
Transient blood glucose/insulin elevations are not pathological, so many eat in a way consistent with what the body needs rather than with what it has had to endure.
Personally, I see nothing wrong with me in 2011 eating rice, so I eat about 120g of carbs from it per day and a pint or so of berries.
I followed the instructions for the Primal Blueprint and by eating low-fructose fruits and low-starch vegetables I came out between 50 and 75 grams per day. I've never felt better in my life.
My favorite hominid evolutionary theory, once again:
No evidence that our ancestors ate any carbs at all. We're designed to shed heat, to hunt in the midday sun, when the rest of the animal kingdom is taking a siesta. That's when we have the world to ourselves. It doesn't take strength, just persistence, to run our quarry to the ground. Kill 'em just with heat exhaustion. It doesn't take a bloodhound snout, which would be useless high off the ground, so big brains are needed to do the tracking. And a nice coolie hat of hair, like any unkempt Afro. And sweat glands galore, a dozens of other features designed to deal with heat. And they all point in the direction of this theory.
And it's all because we walk erect, and therefore absorb less sun heat during the midday hours.
The whole savanna was our oyster. How can you doubt something that ties so many things together like this?
It would depend somewhat on how close you are to the equator, the season, and if there is an ice age going on and all that, but most studies of modern hunter-gatherer types estimate a decent carbohydrate load (30% to 40%, http://www.paleo-diet.co/2010/09/paleolithic-macronutrient-ratios-and-profiles/), so it is not too farfetched to think that our paleo ancestors could get by in similar manner.