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  As we age, energy production declines. Our ability is directly correlated with how well we use oxygen. Using fat as a fuel is ideal and is a sign of conditioning. Even younger people decrease energy production because of poor lifestyle. It is possible to reverse this process. Exercise and diet are a very important solutions.        

Cutting back on sleep drastically lowers testosterone levels in young male adults. Less than five hours a night of sleep had significantly lower levels of testosterone than controls. After just one week of less than five hours a night of sleep resulted in a 10-15% decrease in testosterone levels. Low levels of testosterone lead to low energy, reduced libido,...