Impact of lifestyleThe findings of another study by Travison and colleagues (J Clin Endocrinol Metab. 2006:doi10.1210/jc.2006-1859) indicated that health and lifestyle changes, such as developing diabetes, weight gain or loss of a spouse, can have as much impact on testosterone levels as normal aging during a short to mid-length period of about 10 years.Changes such as weight gain, unemployment an