Many parents of young children are fortunate enough not to have any outward signs of inheritable disorders to pass on to their offspring. Common chronic conditions such as diabetes, coronary artery disease, and cancer often don't manifest themselves until middle age or later, by which time the children have become adults themselves. However, genetic testing for these types of conditions is now being marketed directly to consumers, and parents might theoretically order these tests for their children to give both a better idea of what health problems may lie ahead.
The journal Pediatrics recently published an analysis of an online survey of 219 parents enrolled in a separate study of the effect of genomic health risk profiles on health-related behaviors (which I described in a previous blog post). Overall, parents expressed moderate interest in obtaining genetic testing for their children, with the most interested parents being those who would choose testing for themselves; placed a high value on genetic knowledge for its own sake; anticipated feeling good if their children were found to have reassuringly low chronic disease risks; and felt capable of modifying their child's lifestyle if needed.
Putting aside for a moment the limitations of this particular study, which may not be representative of the attitudes of the general population toward genetic tests, it's interesting to consider the larger question of what we gain or lose by predicting our medical futures, and those of our children, with very imperfect tools. It's one thing to detect early signs of incurable diseases, such as Alzheimer's dementia (personally, I'll pass), but learning that one has a higher risk of a future preventable "lifestyle" disease might potentially motivate that person (or his parents) to pay more attention to diet, physical activity, or other behaviors to counteract that risk. I write "potentially" because as far as I know, no one has even come close to proving that the possession of genetic knowledge is self-motivating, rather than self-defeating. (If I'm destined to develop diabetes anyway, why not have that extra slice of cheesecake now?)
Perhaps there will be a day when a detailed map of one's genome will have at least as much predictive value as I.Q., or SAT or MCAT scores - some, but not a great deal. Until then, I will continue to restrict screen time, send my kids outside to play, feed them lots of whole grains, fruits and vegetables, and cross bridges of future health episodes when we come to them.