Free radicals
(FR) are unstable and highly reactive molecules which cause oxidative damage in our bodies. To illustrate the point, it’s similar to leaving a lump of iron in a glass of water, eventually it will rust up, and that’s exactly what oxidative stress does to our bodies. These Free Radicals are unstable because they are missing an electron, so to try and stabilise themselves, they steal electrons from any molecule that comes into contact with them. Quite a battle going on there!
If you imagine inside your body and think of all the changes that are happening when oxidation (rusting up) occurs, you can imagine the effects it could have in the long term.