I have just a couple of points to add to this. One is that we have to think about this across the life course. Actually, the Canadian Longitudinal Study on Aging that's being funded by CIHR is a good example of where we're starting to look at a cohort of people at age 45 and above, because we know that patterns of physical activity are also very important as you get older. They affect your risk of falls, which is a major factor costing our health care system a lot of money—and a lot of seniors much grief.
The second aspect I'd like to point out is inequities. Not all population groups have the same access to safe environments, to a built environment that's conducive to physical activity, to nutritious food, and so on. This is one area that we've really focused on within our own institute, looking at what it is that we can do about health inequities in the long term.