The free radical theory of aging indicates that the effect of membrane damage produced by free radicals and lipids peroxidation is one of the major reasons of aging.

衰老的自由基学说认为，自由基及其诱导的脂质过氧化对生物膜的损害作用是衰老发生的主要原因之一。

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The extracts may in theory help to decrease production of liver toxins and free radicals which could be partially responsible for producing hangover symptoms.

FORBES: Five Ways To Avoid a New Year's Day Hangover

One theory blames oxidative stress, caused by the onslaught of nasty molecules known as free radicals.

ECONOMIST: The ageing brain