What causes premature greying of hair? There are numerous factors, some of which you are already aware of. It's not usually an indication of ageing to have grey hair. It can be brought on by unhealthy routines, poor diet, addictions, and mental stress. But there are also remedies, just as there are factors that contribute to grey hair. Healthy food, regular exercise, and preparation can stop or slow down the difficulties with greying hair brought on by these negative impacts.