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They discovered the secret of happiness in couple

The secret of a happy marriage is a really complicated at all - wife to be weaker than her husband, according to a study by University of Tennessee.

This study, conducted over a period of four years, suggesting that both partners are satisfied when the woman in the couple is body mass index (BMI) less than men, informs dailymail.co.uk.

BMI is calculated as the ratio between weight and squared height of a person.

Initially, the men remain in a relationship because your partner considers their attractive slim. At the same time, women feel confident and loved, because they already know that men still feel attracted to them.

BMI is used to determine whether a person is overweight or obese. This index was Adolphe Quetelet invented by Belgian statistician (1796-1874) and is otherwise known as "Quetelet Index".

People who have a BMI below 18 are considered weak, those with a BMI between 18 and 25 are considered as having normal weight, those with a BMI of between 25.1 to 30 are overweight, and obesity begins when BMI exceeds 30.

Researchers at the University of Tennessee has selected 169 couples married under the age of 35 years. Participants were asked to complete a questionnaire every six months for four years.

Researchers found that men with higher BMI were more happy early marriage and still remain happy.

The same effect was noted for women - at the end of four years of study, women with a BMI less than their husbands were considerably happier than women who had at least the same weight with their wives.

Andrea Meltzer, coordinator of the study, said: "The wonderful message that results from our study is this: women of all sizes can be happy in their relationships if they have a partner. Is the relative weight that matters, not absolute weight. They should not be to be small and weak. "

"Another idea is that the attractiveness and weight are more important for men. This could be why we see this at the beginning of marriage to men and their dissatisfaction could affect satisfaction for their wives," added the same scientist.

Experts also suggest that women and men are happier in their relationships when men are "stronger in a benign".

"The good news is that there are many things that symbolize the power of men," says Susan Heitler, a specialist in couples therapy. In her opinion, they could pay, intelligence, educational level, height and weight.