Turns out just slowing down digestion can have a lot of benefits.
Also, most Americans eat very, very little fiber. Anything is an improvement. I believe the FDA recommendation is 30 grams a day, and most Americans eat, like, 2.
However, most Americans are not deficient in protein. They eat lots of meat, and very little veggies.
I agree people should eat less carbs in general, but we need to be careful. Ultimately, replacing kale or something with bacon, which is basically tobacco in meat form, isn't going to improve their health. Eat less carbs, eat more protein, but eat the right protein, and the right carbs.