A half-hour argument with your lover can also slow your body's ability to heal by at least a day.

his response, say researchers, was caused by a surge in cytokines – immune-molecules that trigger inflammation. Chronic high levels of these are linked to arthritis, diabetes, heart-disease and cancer.

alling in love raises levels of Nerve Growth Factor for about a year. This hormone-like substance helps to restore the nervous system and improves memory

BEING UNDER PRESSURE

UNCONTROLLABLE LAUGHTER

HIDING YOUR IRRITATION

BREAKING DOWN IN TEARS

FEELING JEALOUS

A CUDDLE ON THE SOFA

WARM FEELINGS OF GRATITUDE

DOWN IN THE DUMPS

Mood medicine: how to manage your emotions

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