ive eaten soy for years and have only benifited from it.
"What's known is that all foods, including soy, are complex collections of chemicals that can be beneficial for many people in many situations, but can be harmful to some people when used inappropriately. In that simple fact lies much of the scientific dilemma--when do data show a food is safe and when do they show there could be problems?
Scientists agree that foods rich in soy protein can have considerable value to heart health, a fact backed by dozens of controlled clinical studies. A yearlong review of the available human studies in 1999 prompted FDA to allow a health claim on food labels stating that a daily diet containing 25 grams of soy protein, also low in saturated fat and cholesterol, may reduce the risk of heart disease"
...
"The problem, researchers say, is that isoflavones are phytoestrogens, a weak form of estrogen that could have a drug-like effect in the body. This may be pronounced in postmenopausal women, and some studies suggest that high isoflavone levels might increase the risk of cancer, particularly breast cancer. Research data, however, are far from conclusive, and some studies show just the opposite--that under some conditions, soy may help prevent breast cancer. It is this scientific conundrum, where evidence simultaneously points to benefits and possible risks, that is causing some researchers to urge caution"
-Soy: Health Claims for Soy Protein,
Questions About Other Components-
http://www.fda.gov/fdac/features/2000/300_soy.html
that might be of some help =\
and for me personally,when i first stopped eating meat i lost weight very quickly with out even trying, but eventually gained it back by not being able to afford the healthier alternatives..and instead ate junk food (this was when i was 14ish...its evil how junk food tends to be cheaper than healthy food)