...And other refined carbs (like cookies, white bread and white rice).
"Foods that have a high glycemic index are the worst for skin, and have been associated with increased acne breakouts," says Bowe. They mess up your skin in two ways: "First they trigger a sugar spike in your blood that leads to a cascade of hormones," she says. So, say hello to breakouts. Second, they cause glycation. "Glycation is when sugar molecules bind to the structures in your skin such as collagen, making them weak and dysfunctional," Bowe explains. Weak collagen equals more signs of aging.
The good news: Bowe says that eating refined carbs with fiber-rich healthy foods can help minimize the damage. On the flip side, if you're consuming high GI foods on a daily basis, that can lead to cumulative damage.