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To understand whether oxidants contribute to the initiation and/or promulgation toward aging, the present study has been undertaken on 220 healthy male volunteers aged 20-80 years selected from the defined electoral area (suburbs of Tirupati, Andhra Pradesh, India) to evaluate the concentrations of free radicals (superoxide anion, hydrogen peroxide), lymphocyte antioxidant enzymes (glutathione S-transferase, superoxide dismutase, catalase), and DNA damage in relation to obesity and smoking (lifestyles). A two fold increase of lymphocyte free radical generation (DNA damage) was observed in older age groups with a reduced antioxidant potential, forming a link between cigarette smoking and oxidative stress represented by an antioxidant imbalance. Body mass index had a positive relationship with oxidative stress, but antioxidant levels did not vary with body mass index. The findings conclude that free radical-mediated oxidative stress and DNA damage accelerate with lifestyle variations under reduced antioxidant potential.

Age-Related Correlation Between Antioxidant Enzymes and DNA Damage With Smoking and Body Mass Index