That being said, very few people are saying that because there is no human dietary requirement for carbohydrate, we should all be on a ketogenic diet from birth until death, every single one of us, no exceptions. (Not even Jimmy Moore, the keto man, himself, is saying this. [See point #3 in this post.]) If anything, it seems to me that the main messages being put out make it clear that people need to find what works best for them, and that even if/when they do find it, it might change over time. (See: Kelsey Marksteiner's 3 step process to determining your ideal carbohydrate intake; and Chris Kresser's 7 things everyone should know about low carb diets.)
See also Robb Wolf's Thoughts on Carbs & Paleo: Part 1, Part 2, and Part 3. (And maybe even this one, written by yours truly.)
The macronutrient (and micronutrient!!) numbers that work best for your wife/brother/boss/next-door neighbor/favorite internet health guru might not be best for YOU. As Robb Wolf might say, “Shocker!”
I guess it all started with Laura Schoenfeld's post, Is a Low-Carb Diet Ruining Your Health? Like I explained here, I really have no problem with the article itself. It's only the title I didn't like so much.
Warning: This is a rant. It is not an especially politically correct one. I am telling it like it is, or, at least, like I think it is. You have been warned.
Second warning: Most (but not all) of what appears below is speculation and informed reasoning on my part. There is some science, but I'm not using a ton of PubMed links because, well, frankly, peer-reviewed scientific literature leaves a lot to be desired these days. I know; I do freelance writing for a supplement company some of you might be familiar with, and in the course of my work, I do a lot of digging on good ol' PubMed. It ain't the gold mine it's cracked up to be. More on that some other time. Bottom line: if you think this post is useless because of its lack of copious citations, you know how to delete the email or close the window.
To the rest of you, happy reading.