Broccoli Boosts Aging Immune Systems

Study findings have shown that sulforaphane, a chemical in broccoli, switches on a set of antioxidant genes and enzymes in specific immune cells. This helps to combat the effects of molecules known as free radicals, which can damage cells and lead to disease.
Free radicals are a supercharged form of oxygen which can cause oxidative tissue damage -- for example, they can trigger the inflammation process that causes clogged arteries. Oxidative damage is thought to be one of the major causes of aging.
According to the study, the ability of sulforaphane to reinvigorate the immune system abilities of aged tissues could play an important role in reversing much of the negative impact of free radicals.

Sources:
Science Daily March 10, 2008