This is the reason. Going from complete crap to real foods (regardless of macro breakdowns) will always improve "the numbers" and body-fat content. It's the long term effects of which real foods that you eat that should be the main point of the argument.
Originally Posted by chia
It's like the 14 threads about juicing that have shown up recently. Yes, a couple of fat guys lost some serious weight while juicing and continuing to eat in a vegetarian lifestyle. Cross (the Australian guy that made the movie) looks fairly healthy with clothes on. The 2nd guy, while he did an incredible job of losing weight, still looks like shit and, IMO, he looks like he is sick. But, he is sticking with what works for him. The only person that I know that has ever excelled at being vegetarian/juicitarian is Jay Kordich. But one person's story doesn't exactly correlate to everyone in the world.
I would focus on the long term effects of vegetarian/vegan diets on the person. You could even bring up the whole mono-culture thing (growing the same damned plant over and over again, killing the soil) and how grazing animals are used in 3rd world countries to "fix" land that has been raped by farmers. There is the whole evolutionary point to argue and vitamin/mineral deficiencies associated with long term veggie/grain only eating.
People too weak to follow their own dreams will always try to discourage others.