As winter storms blanket much of the U.S. with snow, a familiar question is resurfacing: Is consuming snow safe? With millions of people surrounded by fresh, powdery flakes, it’s tempting to take a bite. But before indulging in nature’s icy offering, it’s important to consider what experts have to say on the matter.

While snow may appear clean and inviting, experts warn that eating it can have hidden risks. Snow can accumulate pollutants, dirt, or harmful bacteria from the atmosphere, especially in areas with heavy pollution or near urban centers. The process of snow formation itself also means that certain chemicals can end up trapped inside the snowflakes.

Professionals recommend avoiding snow that has been lying around for a while or snow that’s gathered near roads or industrial areas, as it may contain contaminants. However, freshly fallen snow in areas with cleaner air is likely safer for consumption in moderation.

It’s also essential to keep in mind that snow is made of frozen water, so eating large amounts could cause an upset stomach or lead to a drop in body temperature, particularly if you’re already cold.

Watch this video to find out more about the science behind eating snow and hear expert advice on when, or if, it’s safe to take a bite.