If you're in the mood for upping your antioxidant levels -- antioxidants can cancel out the cell-damaging effects of free radicals, thus lowering the risk of cancer -- here's one quick and easy tip for you: keep your watermelons warm.

Research shows that watermelons stored at room temperatures have much higher levels of antioxidants (beta-carotene and lycopene) than those kept chilled in the fridge. Warm watermelons are even better than fresh-picked melons.

One caution: once cut, watermelons must refrigerated. So try to enjoy your watermelons as soon as you slice and dice them. Then keep your leftovers cool.

Source: Good Housekeeping, July 2007

First, it seemed eating lycopene-rich tomatoes offered protection against prostate cancer. Now it seems this is not so true. In fact, researchers have found an association between an increased risk of aggressive prostate cancer and beta carotene, an antioxidant related to lycopene.

Lycopene seemed for a short time to be a quick and easy fix for men trying to lower their prostate cancer risk. Yet studies are failing to show any significant differences in blood lycopene levels between men who develop the disease and those who do not.

The largest study to yield these results investigated the role of blood levels of lycopene and other antioxidants in the prevention of prostate cancer. It was an unexpected turn of events that led researchers to the link between the most aggressive cancers and antioxidants found in many vegetables. While the observation may be due to chance, beta carotene is known to increase risk of lung cancer and heart disease in smokers and may be worth a bit more study.

It's already been established that type 2 diabetes increases the risk of pancreatic cancer. And now, research indicates there is also a link between type 1 diabetes and this type of cancer.

The risk is relatively small -- but still, those with type 1 diabetes have a likelihood of developing pancreatic cancer that is twice as high as in non-diabetics. This is similar to the risk those with type 2 diabetes face.

There are many theories about the link between diabetes and pancreatic cancer, and this research -- published in the British Journal of Cancer -- helps narrow the scope of the theories.

For example, one researcher says the study rules out "a cancer-inducing role of the insulin-producing beta-cells in the pancreas, because in type 1 diabetes these cells have largely or entirely been destroyed."

Experts say people with diabetes should focus their attention on the most common complications of diabetes such as heart disease, eye disease, and kidney disease and not on the very small risk of cancer. In the whole scheme of things, pancreatic cancer is a rare disease -- and even twice the risk is not very significant.

University of Texas M. D. Anderson Cancer Center researchers have confirmed what more than a few cancer patients have personally believed for some time now. Stress increases cancer growth and finding ways to relax and reduce stress is beneficial to cancer survivorship.

In a preclinical study carried out on mice with ovarian cancer, researchers found that cancerous tumors grew and spread faster when the mice were experiencing increased levels of stress. According to the researchers, the conclusion of this study is the first definitive link between psychological stress and the biological processes that make ovarian tumors grow and spread. It appears stress hormones bind to receptors directly on tumor cells and, in turn, stimulate new blood vessel growth and other factors that lead to faster and more aggressive tumors.

"The concept of stress hormone receptors directly driving cancer growth is very new," said Dr. Anil Sood, the study's senior author. "Not much had been known about how often these receptors are expressed in cancer, and more importantly, whether they had any functional significance. Our research opens a new area of investigation."

The good news in this -- besides the fact that this study begins to validate what cancer survivors have been saying for years in the personal belief of the link between stress and cancer -- is that stress can be controlled and reduced by lifestyle changes and medication. In fact, the researchers found a beta blocker heart medication effectively blocked the adverse effect stress hormones had on tumor growth.

This could open new areas of research. Indeed, Dr. Sood and his team will continue to research the role of stress in cancer and examine the effects of stress hormones on cancers besides ovarian cancer. To read more about the University of Texas M. D. Anderson Cancer Center preclinical study, go here.