This weekend's competition in Wisconsin is a bit more intense than it was in your grade school gym class.
Is there a best time to eat? A recent study fed two groups of mice the same high-calorie food. The mice who ate only when they were active stayed much leaner and had lower cholesterol than the mice who ate around the clock.
What about exercise? Our lungs are nearly 18 percent more efficient at 5 p.m. than they are at noon. Joints are 20 percent more flexible in the evening, and muscle strength peaks in the late afternoon.
Must of us know that our bodies have daily rhythms. Now researchers in the fast-growing field of chronobiology are studying how those circadian rhythms work at the cellular and molecular levels, and finding evidence that the disruption of those rhythms may be connected to weight gain, diabetes and even some types of cancer.