Researchers claim to have finally unlocked the key to what causes some people to overeat.

An international team, led by Yale School of Medicine, has found that”free radicals”— molecules tied to ageing and tissue damage — are crucial to suppressing appetite, the’Daily Express’reported.

In fact, in its study of brain circuits that control hunger, the researchers have found that elevating free radical levels suppressed appetite in obese mice by activating satiety promoting melanocortin neurons.