First off, I think this is good data and commend you for going back to the numbers to make your point. It's not perfect data - as the report says, by nature it's overstating actual consumption - but for short-term trends it is valuable.
But I don't see where gross carbohydrates are decreasing in Table 1. It seems like they went from 420g in the 80's (from under 400g in the 70's) to 480 or so a decade ago.
Taubes argues from the perspective of percentage of total intake. I suppose someone arguing with him could do the same. I tend to prefer the idea of discussing absolute consumption, as you've done, and when we look at it that way, Americans are eating more of everything, across the board: More fat, more sugar, more carbs, more white flour, more pasta, more sodas, more fruit, more meat, etc.
The simplest explanation is that we eat too much. Taubes often argues that's not true, and comes up with elaborate theories about insulin response and such to indicate that we eat too much not because we're gluttonous and too rich for our own good, but because we are victims of some hyper-fattening food (carbs). Taubes theory is a hunch, based on incomplete science. This was the point of my comment way up there at the start of all this. His theory might have some validity. But, you can't simply wave away the fact that we have vast data indicating that a high carb, low fat diet, can be extremely healthy and not lead to weight gain. In fact, the best evidence we have today from large populations indicates that a low-fat, low-sugar, high fiber diet, like that eaten by the Japanese until very recently or in some Mediterranean regions, is probably the best we can do for health and longevity.
It will take a lot of science to convince me that flipping that on its end and making saturated fats and animal proteins a core part of your diet is healthier (or even healthy, at all, though it does appear to be dramatically less dangerous than the American scientific establishment would have us believe).
Anyway, I don't know if Taubes is right or wrong about his insulin and carbs conspiracy theory. I do know, however, that our food production industry has figured out how to cram a lot of calories into foods with little to no nutrition. So, skip the processed/packaged foods. Eat more whole foods. More fresh/frozen produce. Stop buying things that are unrecognizably separated from their original form. i.e. if it started out as a pile of corn and some other ingredients and is now a can of Coke, a snack cake, a donut, a breakfast bar, a "chicken" nugget, or a "whole grain" breakfast cereal; skip it; it's probably not really food and is probably a net negative for your health.
Hmm. Maybe Gary Taubes has changed his approach, because in a typically-logorrhetic blog post last year, he went on about why low-fat calorie-restricted diets work exactly because the "absolute amount of carbohydrates consumed goes down."
Sorry, I meant a decrease from 1909-1919 to the present. I was definitely unclear, sorry about that. You are right, total carb consumption did increase since 1980.
But if carbs were the issue, shouldn't we have been fat in 1909-1919, thin in the 80's, and fat again?
I think it's troublesome to compare general disappearance data from so long ago. There can be long-term trends of things like waste and changing methodologies that mess things up.
I think your point -- that overall carbs are not the issue -- is right on, though. Looking at wheat data from Statistics Canada going back about as far, people seem to have been eating a ton more wheat a hundred years ago than they do today, like 30% more. And yet in those days obesity had a <1% incidence, by some accounts.
I think that's not inconsistent with fingering particular carbohydrates (and even the way they're consumed) as the cause of modern weight problems. That is, I don't think that falsifies the Sunny Delight hypothesis I proposed earlier. There's a reason the Kool-Aid Man is that large -- as mentioned by others, it seems like fructose is the trans fat of carbohydrates.
And, I would say, food disappearance data doesn't help at all in answering the question of the best way for the obese to lose fat. After all, in the 1910s, there almost weren't any obese people! Now that over a third of Americans are statistically obese, this is its own highly relevant issue.
For the record, I realized something interesting about wheat consumption in the USA, which is that sugar follows wheat very often in the modern diet. It's very challenging to find packaged sandwich bread in a USA supermarket which doesn't contain a significant amount of sugar or HFCS. So today, wheat consumption tells you a lot about sugar consumption, but that may not have been the case a hundred years ago.
But I don't see where gross carbohydrates are decreasing in Table 1. It seems like they went from 420g in the 80's (from under 400g in the 70's) to 480 or so a decade ago.