Oxidant stress, Birth defects, and Childhood Cancer

Oxidative lesions in sperm DNA are increased 250% when levels of dietary ascorbate is insufficient to keep seminal fluid ascorbate to an adequate level. A sizable percentage of the U.S. population ingest inadequate levels of dietary ascorbate, particularly single males, the poor, and smokers. The oxidants in cigarette smoke deplete the antioxidants in plasma. Smokers must eat two to three times more ascorbate than non-smokers to achieve the same level of ascorbate in blood, but they rarely do.

In a comparison of sperm from smokers and nonsmokers Viczian found that the number of sperm and the percent of mobile sperm decrease significantly in smokers, and this decrease is dependent on the dose and duration of smoking.

Paternal smoking, in particular, appears to increase the risk of birth defects and childhood cancer in their offspring. One expects, and finds, a much larger contribution to the germ line mutation rate from the father than the mother, age of the father being an important risk factor. Thus, inadequate diets (and smoking) of fathers appear to result not only in damage to their own DNA but to the DNA of their sperm, an effect that may reverberate down future generations.

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