There’s mounting evidence that our body’s natural internal clocks, or circadian rhythms, drive a lot of our biological processes, including weight maintenance. They tend to sync up with daylight. That could be why studies have shown that shift workers tend to have a higher rate of obesity and weight gain—their body clocks are out of sync. One study even found that a third of people who experienced an interrupted sleep cycle for less than two weeks became prediabetic; all of the poor sleepers saw markers for the risk of obesity and type two diabetes climb.
Here's something else most people probably don't know: Fidgeting is good for you. It's considered a nonexercise physical activity, and it's an important way to burn energy. You get more health benefits if, in addition to exercising, you are a more fidgety, more active person the rest of the day. This means gesturing while you're talking, tapping your foot, just moving around.