If you’ve picked up a health book or magazine lately, you know all about calcium’s role in preventing osteoporosis, the brittle-bone disease that inca­pacitates thousands of women (and men) each year. But if scientific studies are any indication, there may be another, more immediate reason to add a calcium supplement to your medicine chest: It may relieve PMS.

In one study, researchers studied the diet of more than 3,000 women over 10 years and found that those who consumed 1,200 milligrams of calcium and 400 IU of vitamin D a day through food had up to a 40 percent less chance of experiencing PMS. And it appears that choosing the low-fat versions of high-calcium foods made a difference. Women who drank 2 per­cent milk or lower had fewer symptoms than women who drank whole milk.

Researchers who say vitamin C is helpful for asthma point out that other nutrient with similar antioxidant properties could be beneficial. These nutri­ents include vitamin E, selenium, and beta-carotene, a yellow pigment found in carrots, cantaloupe, and other fruits and vegetables. Laboratory work indi­cates that all three help reduce inflammation-producing biochemicals.

“So far, however, all we have are primarily case-control studies,” said doctor. Those studies that looked at actual supplementation with micronu­trients or vitamins did not show significant improvement of lung function, with the exception of one study, according to professional nutritionist. In that study, people with asthma who took 100 micrograms of sele­nium daily for 14 weeks had improved lung function and were less sensitive to airway-constricting inhalants than when they were taking placebos (inac­tive pills).