This is one of the best videos I've seen which manages to cover virtually everything anyone needs to know about diet - including the science, the politics, the history, and the impact of diet on disease. It's an hour long, but he fits an awful lot of hard facts into that hour. You COULD go and read half-a-dozen long books (some of which are mentioned in the video) ... or you could just spend an hour listening to this guy. I attempted to pick out a few quotes for those who are short on time, but I soon gave up: (a) because it's all good, and he wastes no time on filler, and (b) many of his points lose their subtlety if taken out of context. A good example of the latter would be his critique of 'meat is bad for you' studies at 40:40.
If I've understood correctly, Diamond has familial hypercholesterolemia, but remains healthy through dietary control. While the video basically documents his journey through the science and the nonsense (Diamond has a proper science PhD, unlike a lot of people who put 'PhD' after their names or call themselves 'Dr') this is in itself enlightening, because it's a journey that most people need to undertake. It's certainly not one that the health establishment will walk you through, or approve of.