You've heard this before, but study results haven't always lined up. Now Eunyoung Cho, ScD, of Brigham and Women's Hospital in Boston, and colleagues have combined data from 10 studies.
It's a lot of data. It includes more than half a million people followed during a six- to 16-year period, and includes information on nearly 5,000 cases of colon cancer.
The studies looked at a variety of dairy products. While some other dairy products were linked to reduced rates of colon cancer, milk had the strongest association.
Compared with people who consumed less than 2.5 ounces of milk a day, those who drank 9 or more ounces a day had a 15% lower risk of colon cancer. Every 500 milligrams per day increase in milk -- about two 8-once glasses -- cut colon cancer risk by 12%.