I've seen the documentary and it was pretty interesting, although it mostly panders to the Convention Wisdom, e.g. fat makes you fat, red meat is bad, don't eat cholesterol-rich foods, etc. The idea of eliminating processed foods seems like a good way to roll in my opinion, although I don't agree with cutting out meat. The idea that the proteins in plants are equal to the proteins in meat is incorrect and in addition, the idea that the nutrients and vitamins that plants are rich in are very bioavailable (or even moderately so) is also incorrect. There are many things in this documentary that are scientifically wrong or inaccurate, but a similar bias shows up in other work for the opposite argument.
On the other hand, I'll go on record and say that I think vegetarian/vegan diets are healthier than the standard American diet with the caveat that it's supplemented appropriately (B12, some iron help, and taking care of high homocysteine levels). That being said, the pro-inflammatory nature of typical vegetarian and vegan diets along with the inherent deficiencies (and elevated homocysteine levels) makes it pretty unreasonable as being the "optimal" diet. I think raw vegans get one step closer, but still run into the same issues as other vegans/vegetarians.
If you're interested in getting really strong while leaning towards ultimate health, I think you'd be well served to follow a whole-foods based diet, based on grass-fed (and finished) meats, wild caught fish, fresh vegetables and produce, and other single-ingredient foods like rice, tubers, etc. and clean water. Campbell's biggest work, The China Study, has been reamed, rebuked, and spit out so many times that I'm not going to waste any bandwidth talking about it. A simple google search will result in plenty of information on this topic.