DEAR DOCTOR K: Does eating fish help prevent prostate cancer?
DEAR READER: You've certainly heard me encourage readers to eat plenty of fish, particularly fatty fish such as salmon and mackerel. That's because many good studies have found that people who eat fish frequently have lower rates of many serious diseases, including heart disease and several types of cancer. A recently published study from the Prostate Cancer Prevention Trial (PCPT) was described in the media as coming to the opposite conclusion. I don't agree, but to explain why, I first need to talk about the substances in fish that are thought to be beneficial for humans.