Medical Research

Should I participate in a research study?

DEAR DOCTOR K: I have a particular disease. A nearby medical school is recruiting people with my condition to participate in a research study. Should I volunteer?

DEAR READER There are two good reasons to consider volunteering for a study: It might help you, and it might help others. In some types of studies, there also may be risks to you. Sometimes my patients ask me: "Do we really need to do all these medical research studies?

Will studies of our genes change medicine and improve our lives?

In yesterday's column, a reader asked whether she should be tested for genes linked to Alzheimer's disease. Today, I thought I'd give you my view on the larger question: Will studies of our genes change the practice of medicine and improve our lives?

My answer: During my career, progress in human genetics has been greater than virtually anyone imagined. However, human genetics also has turned out to be much more complicated than people imagined. As a result, we have not moved as rapidly as we had hoped in changing medical practice.

You recently talked about two kinds of abdominal fat — brown fat and white fat. Could you explain the difference?

DEAR DOCTOR K: In a recent column about abdominal fat, you talked about two kinds of fat -- brown fat and white fat. I'd like to hear more about them.

DEAR READER: I'm glad you asked, because the discovery of these two types of fat could prove to be very important. In the column you're referring to, I discussed how visceral, or abdominal, fat (which accumulates deep inside the abdomen) is more harmful to our health than subcutaneous fat (the fat just beneath the skin). But when it comes to fat, it's not just location that matters. Color counts, too -- and brown is better.

What should I know before entering a clinical trial?

DEAR DOCTOR K: I have prostate disease and treatment hasn't worked. My doctor suggested I participate in a clinical trial. I'd like to know more before I give him an answer.

DEAR READER: When established treatments aren't effective, participation in a clinical trial can be a good option. Such trials give you access to promising treatments that might work better than one already on the market. On the other hand, clinical trials test treatments that are still under investigation. There may be unpleasant or serious side effects. Clinical trials are designed to minimize risks to participants, but they cannot completely eliminate them.

What is BPA? Is it harmful?

DEAR DOCTOR K: Is the chemical BPA just another health scare? Or is it really something I should be worried about?

DEAR READER: BPA stands for bisphenol A. It is used to make a plastic known as polycarbonate. Polycarbonate is sturdy and resists shattering, so it's a great material for water and baby bottles. BPA is also used to line the inside of cans so the metal of the can doesn't directly touch the food or beverage. It's used in some dental sealants and as an ingredient in the paper on which many receipts are printed. So there's no question that we're exposed to BPA.