With each one lasting an average of five weeks. That adds up to 104 diets between the ages of 18 and 70, in total lasting the equivalent of ten years. One in ten women goes even further, spending 25 years or more dieting. The poll of 4,000 women by LIPObind, a firm which makes natural weight-loss supplements, found a third started their first diet at the age of 16 or under.
Thirty-nine per cent said they tried to lose weight because they were embarrassed about their looks.
However, 32 per cent were concerned they will be responsible for making their own children fat or obese.
With each diet seeing an average of 6.3lbs dropping off, that means women could lose almost a stone every year.
However, a quarter of all women lose nothing at all, and the fact that the average woman embarks on at least two diets every year suggests any weight they do lose does not stay off.
Dr Glenn Wilson, of the Institute of Psychiatry at King’s College, London, said: ‘This highlights just how much women think about their weight and the pressure associated with keeping in shape.’
"Women's weight is bound to fluctuate due to life changing events such as having a baby, emotional factors associated with relationships and changes in their working environment. "These changes and yo-yo dieting seems often to go hand in hand.
"Feeling healthy and in shape can make such a difference to overall well-being yet many people struggle to reach and sustain their ideal figure with a shocking 25 per cent who would even be willing to go under the knife to get rid of their extra pounds."
The survey also showed that more than 41 per cent of women admitted they feel like they are constantly on a diet or watching what they eat, 44 per cent say that no matter what they do, they never seem to lose weight, and 59 per cent don't think they will ever achieve the shape they want.
According to the research, the average woman aspires to be a size 10, however a quarter believe being a size eight or under as ideal. Thirty nine per cent of people have been so embarrassed by their looks, they have lied about their dress size or weight.
And 77 per cent of people would support a ban on airbrushing pictures of celebrities and models in a bid to take the pressure of normal women. Another 39 per cent even get shy when they come to stripping off in front of their partner.
However, it's not just our own weight we are worrying about. A total of 32 per cent of women are concerned that they will be responsible for making their own children fat or even obese.