Scientists have revealed the 10 commandments for a long and happy life.

Scientists have revealed the 10 commandments for a long and happy life. And the rules even allow for sunbathing, drinking alcohol and eating chocolate.

The list was drawn up after experts trawled medical studies published over the past 50 years examining why people are living longer.

The first rule, as published in the New Scientist magazine, is to enjoy yourself.

Married

Second on the list is remaining sociable, with a happy marriage and good family life being essential for health.

Studies have shown that marriage can add as much as seven years to a man's life and two years to a woman's life.

Where you live also has a huge effect on your health.

The world has many 'longevity' hotspots where the number of centenarians exceeds 10 in 100,000. Hawaii, Sardinia, Nova Scotia and Japan are amongst them.

A Drink

So-called vices like wine, partying and chocolate provide the fourth rule, with countless studies showing that a little of what you fancy does you good rather than harm.

Work Your Brain

The fifth rule says that you should exercise your brain to stay active.

Last month scientists at Cambridge University said puzzles could help ward off a range of conditions, from depression to schizophrenia.

Knitting, doing crosswords or just walking also help.

See The Doctor

It's simple really. If you're sick, get treatment fast.

Eat Healthily

The seventh rule is well-known - you are what you eat.

Scientists have recommended that the low-fat, high-fibre Mediterranean diet is a model for healthy eating and a long life.

A recent study found that the hearts of those who had followed the diet appeared 15 years healthier than those of volunteers of a similar age.

High in fruit and vegetables, the diet also uses beans, breads and cereals.

Small amounts of meat and moderate amounts of fish are also eaten.

Take Risks

Rule eight urges people to put more excitement into their lives.

Intellectual challenges, travelling, or learning a new language can all add years to your life.

Embrace Technology

Rule nine advises those seeking a long life to embrace new technologies.

Be Happy

Merely living longer is not worth doing unless it is an enjoyable experience.

Rule ten is that you should smile and feel happier in life.

Research from the Netherlands showed that older men with an optimistic outlook on life were only half as likely to suffer from cardio-vascular disease as those whose world view was more negative.