If your antioxidant levels in your body are low. How soon would you want to know? Antioxidants are substances that may protect cells from the damage caused by unstable molecules known as free radicals. Free radical
 damage may lead to cancer. Antioxidants interact with and stabilize free radicals and may prevent some of the damage free radicals otherwise might cause. Examples of antioxidants include beta-carotene, lycopene, vitamins C, E, and A to name a few.
When you have too few antioxidants to counteract your free radicals, significant damage can occur, leading to a variety of chronic degenerative diseases, ranging from stroke and fibromyalgia, to sinusitis, arthritis, vision problems, and even Parkinson's and Alzheimer's disease. A poor diet, cigarette smoking, environmental pollutants, and ultraviolet (UV) radiation from the sun also increase the free-radical load, creating a situation known as "oxidative stress."

Summarized question: How fast do you know when the antioxidant levels in your body are low?