It only takes two bottles of wine consumed over the course of one weekend to more than double the risk of breast cancer, according to a Danish study of 17,647 women which breaks down like this: women who drank 22-27 drinks per week had twice the risk for the disease compared to those who drank only one to three drinks.

Think about this:

More than a quarter of participants, age 44 and older, drank more than the recommended 14 drinks per week. One in 10 were binge drinkers -- they had more than four drinks per day. Thirteen percent were weekend bingers -- they had more than 10 drinks between Friday and Sunday. A drink is considered one bottle of beer, wine, or spirit. In Denmark, each unit translate into 12g of alcohol.

Published in the European Journal of Public Health, this study found breast cancer risk is greatest when drinks are consumed in a short period of time. This is because the concentration of alcohol in the blood peaks, making it more harmful to the body.

"What our study suggests is that the total amount of alcohol consumed has a detrimental effect on the risk of breast cancer, but also the drinking pattern seems to have an impact," says lead researcher Dr. Lina Morch.

The bottom line: to reduce the risk of breast cancer, women must limit the amount of alcohol they drink.

Cell phones don't cause cancer, according to a major study from Denmark that tracked 420,000 Danish cell phone users -- many of them users for more than 10 years and some for more than 20 years.

In the largest ever study to yield good news about the safety of cell phones, scientists matched phone records to the Danish Cancer Registry -- a listing that records every citizen who gets the disease -- and on Tuesday, the study results were revealed.

Cell-phone users are no more likely than anyone else to develop cancer.

But the lead researcher of this massive investigation says doubts will surely linger. There is really no biological basis for concern about radio waves, he says. But people still worry.

Cell phones beam radiofrequency energy that can penetrate the outer edge of the brain, causing suspicion about the origin of various cancers. Most research has found no link between cell phones and cancer, but the phones have never been given a definite clean bill of health either.

"As the body of evidence accumulates, people can become reassured that these devices are safe," says one cell phone researcher.