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The health benefits of a soy-rich diet have been well documented. However, more recent research has also demonstrated the dangers of a high soy intake - specifically in relation to cancer and soy's oestrogen-mimicking capability. From the article -

1. "High soy consumption may accelerate tumour growth and interfere with conventional medicine used to treat cancer."
2. "Men with prostate cancer are also being told to avoid it because it could irritate the male hormone androgen."
3. "Men may be affected too, as soy may reduce fertility by increasing phytoestrogen levels." (more info)
   
4. Soy contains high levels of phytic acid, a substance which can block the uptake of essential minerals - calcium, magnesium, copper, iron and especially zinc. Zinc is needed for proper development and functioning of the brain and nervous system, and for a healthy reproductive system.

As usual, you can find more information on soy over at the wiki page.

In a related article [2], the link between protein supplements and muscle growth has just been given a boost by Australian scientists. In a 10 week trial, the scientists found that individuals "who consumed the [protein] supplements immediately before exercising with weights gained much more muscle and strength than those who took the same supplements at other times of the day."