Free radical is a molecular species that contains an unpaired electron in an atomic orbital. A free radical will steal an electron from a molecule, that molecule is then missing an electron and becomes a free radical. Free radicals are essentially thieves!
For example; There are 10 people that don’t know and don’t care about each other who live in the same house with 1 apple to eat each. An outsider, the free radical, steal 1 apple.
Matthew realises he misses his apple, so he steals Lucy’s apple. Lucy then steals Mark’s apple, and so on. This domino stealing chain creates a lot of tension in the house. Lucy argues with Matthew, Mark leaves the house which means he becomes the free radical of the next-door neighbour.
"Free radicals can damage not only our DNA, but proteins, lipids, and cell membranes in the body."
Your body does have the defence mechanism to fight against theses free radicals in the form of antioxidants, and substances known to have a number of health benefits. Antioxidants can safely interact with free radicals to stop their actions before vital cells are damaged. Our bodies don't make these antioxidants; they must be brought into the body nutritionally. The main antioxidants in our diet are vitamin E, beta-carotene, and vitamin C.