Vegetarians?

Impractical in the US. Unfortunately, in the US much of our food that's sold to us has soy-based fillers used in it, even Vegan-friendly products. Tofu is entirely soy-based. Soy in small amounts is not a bad thing as it is a good natural source of protein. However, in larger amounts it has been proven to have a bad effect on human hormone production. Specifically, it reduces testosterone production while increasing estrogen production.

The only NATURAL way to counter the effects of large amounts of soy in your diet is to consume creatine, soy's polar opposite as far as hormones are concerned. And creatine is only found in one place in nature: Red meat.

In other words, soy screws with your hormones and the only way to keep things balanced is by balancing your soy intake (which you can't control unless you eat NOTHING BUT fresh fruits and veggies from your grocer's produce section due to its presence as a filler in foods) with red meat consumption.

As an avid weightlifter, I have ridiculously high protein intake demands. I need to consume upwards of 175g of protein a day which is not possible without turning to "artificial" protein sources such as protein bars and protein shake mixes, ALL OF WHICH use soy-based protein in them. So I need to balance it out with creatine, and unless I get that from a supplement as well, that means red meat.

Don't think it's a good idea, health wise, iron and protein are required in your diet, iron is specifically required in the female diet. My sister used to be a vegetarian and she had low blood iron with high blood pressure... the doctor told her she had to eat meat. So it seems like a nice 'save the animals' idea, but it isn't good for your body.