Looking back, it’s now obvious that the Lalonde report did initiate a change in our fundamental understanding of the determinants of health – an understanding that is now beginning to flourish. By stressing the influence of non-medical factors on population health, the report made it possible for governments, academics, and foundations to endorse practices outside conventional medical care. Medical practitioners are equally aware that health care by itself cannot secure a population’s health. Following the Lalonde report, politicians, health merchants, and mass media moguls seized on the idea of healthy lifestyles. They tried to convince us that personal responsibility was the primary determinant of health. In the end, however, I am cautiously optimistic that it is not their voices that will prevail.

In the 1970s, public health policies began to promote the idea that individuals are responsible for their health and therefore have an obligation to adopt healthy lifestyles. Over the ensuing decades, health became an especially popular topic for media coverage as well as a lucrative market for vendors of health-related products and services. What followed was a substantial increase in health consciousness and greater anxiety about all things that concern the body. Do healthy lifestyles produce better health? That they should may seem like common sense, which is one reason it’s been so easy to promote the idea. The question is difficult to answer with absolute certainty, however.

Throughout history there’s been an understandable desire to find connections between our behavior and our health. Human beings have practiced health regimens involving diet, exercise and hygiene since antiquity. When medicine was based on the humoral theory of disease, for example, individuals were advised to purge the body in the spring and, in the summer, avoid foods or activities that caused heat. Bathing in ice water was recommended in the 19th century. Mark Twain quoted the advice: “the only way to keep your health is to eat what you don’t want, drink what you don’t like, and do what you’d druther not.”

That we’re not routinely made seriously ill by this shortfall … is due largely to the fact that most medical interventions and advice don’t address life-and-death situations, but rather aim to leave us marginally healthier or less unhealthy, so we usually neither gain nor risk all that much.