Will give the brainlest

what causes cells to become dangerous/unhealthy?

harmful molecules can cause dangerous/unhealthy

Harmful molecules are continually bombarding your body. The worst offenders are glucose, and free radicals, by-products of energy production. Both can damage the proteins, fats and DNA that make up your cells. When you are young, your body is able to repair most of this damage. But as you get older, the repair process is less efficient.

when it's short and dry.