Thanks for bringing my attention to this interesting video.
I can't really comment on the facts since I neither read all the studies or had time to watch the whole video.
I'm not an expert in nutrition so this is my personal opinion. I think he's raising some valid points:
* It's a surprisingly difficult subject to study.
* There're a lot of bad studies.
* There're a lot of dubious conclusions.
However, losing weight is just a matter of energy balance. If you consume less energy then you "use", you will lose weight. Consuming less can be done in many different ways. As can "using" more. Different diets may however bring additional advantages (such as decreased risk of cancer).
It also depends on what you are doing with your body, for example, you won't find many tour de France cyclist eating low carb before a race.
So why are you still of the opinion that losing weight is just a matter of energy balance? Are you familiar with other studies which have shown this claim to be correct?
As you can probably tell, I'm a low carber myself, but I'm genuinely curious to understand how did the "energy balance" consensus opinion form. It seems that currently, both opinions aren't rooted in scientific studies. BTW, there's an initiative called nusi.org that attempts to solve this once and for all (by proving low carb diets are right and everyone else is wrong, of course :-)
It's a simple matter of physics and biology that it comes down to energy balance.
The hard part is accurately measuring inputs and outputs and whether some diets will make it easier for a given individual to maintain their inputs below their outputs.
Let me phrase it like this. If you consume less calories than you expend, you are going to lose weight as the body will used stored chemical energy to survive.
I can recommend the BBC Horizon documentary "Why Are Thin People Not Fat"
Homework: Exactly where does they weight you lose go?
http://www.youtube.com/watch?v=y1RXvBveht0