Washington: A drop in testosterone levels over time is more likely to result from a man’s behavioural and health changes than by aging, a new study has found.Many older men have low levels of the sex hormone testosterone, but the cause is not known.Few population-based studies have tracked changes in testosterone levels among the same men over time, as their study did, Gary Wittert said.“Declining testosterone levels are not an inevitable part of the aging process, as many people think,” Wittert, co-author of the study from the University of Adelaide in Adelaide, Australia, said.“Testosterone changes are largely explained by smoking behaviour and changes in health status, particularly obesity and depression,” he said.In this study the authors analyzed testosterone measurements in more than 1,500 men who had measurements taken at two clinic visits five years apart.According to Wittert, all blood testosterone samples underwent testing at the same time for each time point.
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