"who is saying that?"
"The conventional thinking, held by the large proportion of the many researchers and clinicians I’ve interviewed over the years, is that obesity is caused by caloric excess."
"The minority position in this field — one that Dr. Ludwig holds, as do I after years of reporting — is that obesity is actually a hormonal regulatory disorder, and the hormone that dominates this process is insulin."
5 or so paragraphs in. Waffling and innuendo about how it's really not about calories, while when you look deeper, it is - but they never acknowledge it as such because if they would, WTF would be so special about it?
"second goes further and explores difference between sources of calories and why it's wrong to say that caloric number is all you need to care about."
Caloric number is all you need to care about. It's just easier to control when your blood sugar levels don't swing all over the place.
Caloric intake is like the first oscillation on a 1D Perlin noise function; cutting back specific foods (not 'sources of calories', but specific compounds that have a certain effect on the body) are a second oscillation, transposed on the first one. So you can cut back all the carbs you want, if you don't get your daily energy intake below your energy expenditure, you'll never lose weight. There are other ways of losing weight too, that would work for everybody, but they're mentally hard(er). You can lose weight by eating a McD hamburger and small portion of fries each day, as long as you don't eat anything else (actually, after those two, you still have a 1000 cal budget left, which you could expend on another two portions of fries, or pure sugar if you'd like, and you'd still loose weight).
"you really should read up on ketogenic diet before criticizing it."
I'm not critizing the low carbs diet itself; it's well-known that cutting back on carbs is a relatively easy way to loose weight. When I used to fight and had to cut weight, it was standard advise to the point that it was obvious to everybody who'd spend any time in the gym, even those who had been doing it since the '80s at least. What I'm critizing is these shysters who peddle this sort of 'advise' as something or somehow magical or more than a trick to make it easier to get you calorie intake down. Because that's all it is. A good trick, sure, but still just a way to get your calorie intake down.