Testosterone levels decline with age but there are differences among the levels in different men.
.

The study took men who were diagnosed as suffering from depression and
found that they had significantly lower levels of both total testosterone,
and free testosterone.

They found those men whose level of free testosterone was in the bottom
20% were three times more likely to be depressed than those in the top 20%.

The study also found a link between poor health and testosterone levels. This
raises the possibility that men with low testosterone levels may be prone
to depression because they are also more likely to be in poor physical health.

Testosterone therapy offers a relatively simple intervention, potentially,
for some groups of older depressives with hypogonadism (low production of sex
hormoProfessor Stafford Lightman, a hormone expert at the University of Bristol, said testosterone potentially had many small effects which could raise the risk of depression. For instance, low levels had been linked to poor cognitive performance.

It is not expected that low levels of testosterone is the only cause of depression
in older men, but it appears to be a contributory factor.

According to a new study conducted by the University of New South Wales graded certain activities commonly thought to cause cancer on a scale  from proven and likely, to inferred, unknown or unlikely.

The study found smokers and smokers who have quit to be the most at risk, although the risk is reduced for people who quit smoking. Drinking alcohol was also a high risk factor, particularly for people who also smoke.

Drinking chlorinated water and using a mobile phone was far less likely to cause cancer  although the risks associated with the long-term use of mobile phones had not been fully established

The study also reported that there was little risk from drinking coffee, using deodorants, drinking fluoridated water and having breast implants or dental fillings.

The study also confirmed a number of well known cancer causing activities