But it is not just a description it is a technical term with a clear definition set out by the medical profession and determined by what is known as the Body Mass Index.

Although it is not perfect, leading medical experts agree that the BMI, measured by dividing a person's weight by the square of their height, is the best way of discovering whether or not a person is obese.

To raise awareness of the BMI, Lighterlife, a unique weight-loss programme geared towards those at least three stone overweight, have launched the BMI 4 Life campaign.

As part of the campaign Driffield's Lighterlife counsellor Hilary Clayton is warning of the dangers of being just three stone overweight and is keen to offer tips and advice on beating the battle of the bulge.

Hilary said: "Two-thirds of adults are classified as overweight and almost 25 per cent of all men and women are now obese, and being just three stone above your ideal weight classifies you as obese.

"One of the main problems associated with excessive weight gain is a lack of awareness of the potential health hazards.

"Even if you think you are only a little overweight you could still be at risk, as any extra weight gain can increase your chances of ill health."

According to Hilary carrying excess weight can lead to a whole host of health problems such as joint problems, arthritis, high blood pressure, and even infertility.

"Women may also experience fertility problems as obesity causes hormonal imbalances that can have an impact on ovulation and menstruation, and there's an increased risk of diseases such as diabetes and cancer," Hilary added.

However it is not all doom and gloom for those falling into the overweight, obese or morbidly obese categories of the BMI.

According to Hilary many of the health conditions associated with being overweight can be prevented and risks reversed by taking positive action.

Hilary said: "Losing as little as 10 per cent of your weight can substantially reduce high blood pressure, boost female fertility, decrease your risk of heart disease and lead to a 10 per cent fall in total cholesterol and a 50 per cent reduction in the risk of developing type 2 diabetes.