According to a new study, levels of obesity are going up not just because of our sedentary lifestyles and unhealthier processed foods, but also because we aren't sleeping enough, and because of airconditioners (never did like those things), certain medication, chemical contamination (read: pollution) and not smoking as much as we used to (which reminds me, the great-aunts and grandmas who were once in purdah used to smoke bidis on the sly, and they were all thin as reeds).
Which doesn't mean that you can go berserk with refined grain and sugar, while trying to sleep off the adipose tissue. It just means that when on diet, sleep a lot. Preferably in the open air. This is just the right weather.