This is a typical article on vegetarianism written by a nutritionist. A writer who is an animal rights advocate and a vegetarian will put a different spin on eating a well-balanced diet. This writer assumed that many people who turn vegetarian don't really know what they are doing, and there are probably some who don't.
But all vegetarians and vegans I know have done their research well and they have turned vegetarians not because they want to be trendy but because they want to be healthier and ethical in their choices. It's not fashion that drives most people to become vegetarians, but a personal philosophy and a real commitment against animal cruelty. At least, this is true among my group. This writer saw it as a matter of nutrition; animal rights advocates will see it as a matter of decency.
The point that I agree with is that meat is not the only source of protein in this world. Whenever you meet someone who says that he needs his meat for protein then that's the meat industry speaking through him. He needs to think outside the box. Remember that gorillas and elephants require protein in their diets too.