What does the free radical theory propose as the cause of aging?

What does the free radical theory propose as the cause of aging?

• A. Accumulation of cross-linked proteins
• B. Wear and tear of tissues
• C. Damage from oxygen free radicals
• D. Genetic programming changes

Answer: (C)

Free radical theory centers on oxidative damage as the driver of aging. During normal metabolism, especially in mitochondria, reactive oxygen species (oxygen free radicals) are produced and can attack vital cellular components—DNA, proteins, and lipids. This damage accumulates over time, impairs cell function, and contributes to aging and various age-related diseases. The idea is that aging results from this ongoing oxidative injury, which is why damage from oxygen free radicals is the best fit for what the theory proposes. Other ideas describe different concepts but don’t target the same mechanism. Accumulation of cross-linked proteins is related to structural changes from aging processes but isn’t the central mechanism the free radical theory emphasizes. Wear and tear is a simplified view of gradual deterioration. Genetic programming changes reflect theories that aging is preprogrammed rather than driven primarily by accumulated oxidative damage.

Free radical theory centers on oxidative damage as the driver of aging. During normal metabolism, especially in mitochondria, reactive oxygen species (oxygen free radicals) are produced and can attack vital cellular components—DNA, proteins, and lipids. This damage accumulates over time, impairs cell function, and contributes to aging and various age-related diseases. The idea is that aging results from this ongoing oxidative injury, which is why damage from oxygen free radicals is the best fit for what the theory proposes.

Other ideas describe different concepts but don’t target the same mechanism. Accumulation of cross-linked proteins is related to structural changes from aging processes but isn’t the central mechanism the free radical theory emphasizes. Wear and tear is a simplified view of gradual deterioration. Genetic programming changes reflect theories that aging is preprogrammed rather than driven primarily by accumulated oxidative damage.