When: When you're breaking out

Why: Stop popping those pimples! According Marcia Kilgore, esthetician and owner of Bliss Spa in New York City, the best time get a facial is when you're slightly broken out with whiteheads. Whiteheads are a telltale sign that bacteria is spreading through your pores, and extraction could prevent those whiteheads from becoming full-fledged pimples.

If it's too tricky to time your facials to your breakouts, schedule facials the week before or the week during your period, when skin is most sensitive.

When: Before 3 p.m.

Why: Researchers at Bringham and Women's Hospital in collaboration with the University of Murcia and Tufts University found that individuals who ate lunch after 3 p.m. lost significantly less weight and had lower estimated insulin sensitivity (a risk factor for type 2 diabetes). Researchers also found that subjects who chose to lunch later in the afternoon were more likely to skip breakfast -- the meal that jump-starts the metabolism for the rest of the day and prevents you from stuffing your face (and spiking your insulin levels) in the afternoon.