There are many reasons why some people live long healthy lives while others don't, but one of them is undoubtedly genes. That doesn't mean we should be negative about our chances of ageing in good health. Although our genes are handed down from our parents, the hand that we are dealt seems to be influenced by our lifestyle, too. Food, physical activity and stress can change how genes function by adding "chemical tags" that act as on/off or dimmer switches, influencing our health and lifespan. The study of this process is known as epigenetics.
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