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Whole grains contain fiber and nutrients that can help your health.

It's a low-carb world, and many people are pushing grains off their plate in an effort to control their waistline. But they may be doing their body a disservice. Whole grains have some unique properties that make them a valuable addition to the diet. Not only do they contain a host of nutrients, such as iron, B vitamins, copper, zinc, and magnesium, but studies have linked diets rich in whole grains to a lower risk of colon cancer, which is a growing health threat for many younger Americans.

"The main benefit of whole cereal grains, such as wheat, oats, and barley, is in the fiber," says Teresa Fung, adjunct professor in the Department of Nutrition at the Harvard T.H. Chan School of Public Health. "Cereal fiber is different from vegetable fiber or bean fiber."

Learn to spot an actinic keratosis before it becomes cancerous.

About 58 million people have at least one actinic keratosis (AK), a precancerous skin growth caused by too much sun exposure.

Yet most people don't see the potential danger in these lesions because they are small, with few if any annoying symptoms, and can go away almost as fast as they appear.

In the journals

Need another reason to monitor your intake of ultra-processed foods? Cutting down on your amounts could help you live longer.

In an observational study published online Feb. 11, 2019, by JAMA Internal Medicine, almost 45,000 adults ages 45 and older completed several dietary assessments over a two-year period. On average, ultra-processed foods made up about 15% of their daily diet as measured in grams.

Ask the doctors

Q. I have endometriosis, and I recently heard that it might increase my risk of certain cancers. Is this true?

A. Researchers have linked endometriosis, an often painful condition that causes endometrial-like tissue to grow outside the uterus, to a higher risk of two types of ovarian cancer � endometrioid and clear-cell subtypes. That said, even though your risk of these cancers may be higher than that of the average woman who doesn't have endometriosis, your chances of developing one of these cancers is still very small � less than 1%.

Ask the doctor

ÌýImage: © AndreyPopov/Getty Images

Q. My doctor says I have a small skin cancer on my scalp, but it's not melanoma. Do I really need to have it removed?

A. It's true that melanoma is the most dangerous type of skin cancer, because it can spread throughout the body. You definitely need to have any melanoma removed, to try to excise it before it spreads. Two other types of skin cancer, basal cell carcinoma and squamous cell carcinoma, are more common than melanoma. It sounds like you have one of those. They spread only rarely, but they do grow larger. Not only is this disfiguring, but delay in removing them makes it harder to remove them with only a minimal scar. And cancers on the scalp, when they become large, can be particularly hard to remove.