In case the risk of heart disease isn’t enough to make you swear off trans fats for good, they may also be bad for your skin. “Trans fats promote inflammation,” says Dr. Ostad.
Plus, the unhealthy fats may make you more vulnerable to UV damage, which is the number-one cause of aging, according a preliminary mouse study published in Lipids. Don’t be fooled by a label that says “0g trans fat,” as it can still contain under 0.5g of the artificial fat. Make sure to avoid products that list a partially hydrogenated oil on the ingredient label, too.