Two out of three men in Ireland are overweight, and that factor substantially increases their risk of developing cancer, a survey has claimed.
The survey of 600 men was carried out by the Irish Cancer Society to mark Men's Cancer Action Week, which starts today.
Nearly half of all men (44 per cent), according to the survey, are in denial about being overweight, even though it can increase their risk of certain forms of the disease.
Although two-thirds of Irish men are overweight, and some 20 per cent are obsese; just 22 per cent of those questioned admitted to any weight problem, and none described themselves as obese.
Each year 6,500 men are diagnosed with cancer, and the Irish Cancer Society said being overweight was a key risk factor in the development of certain cancers, including prostate and bowel cancer.
Dr Ian Banks, GP and president of the European Men's Health Forum, warned that men had to take notice of their diet.
"The truth is that experts are only really beginning to understand the complexities involved in how diet affects cancer risk, but the key advice for men is to be a healthy weight, be active, enjoy physical activity and reduce alcohol intake," he said.
The survey found that although 61 per cent of men recognised that being overweight increased their risk of cancer, only 38 per cent
made any attempt to keep their weight down. Just half of the 600 men questioned claimed to have a balanced diet, and only 54 per cent said they were physically active.
Two thirds ate less than the recommended daily amount of fresh fruit and vegetables.
Being overweight or obese is estimated to account for 11 per cent of colorectal cancers, 37 per cent of oesophageal cancer and 25 per cent of kidney cancers, as well as being indirectly linked to other forms of the disease.
According to the Irish Cancer Society, men can reduce their risk of prostate cancer by eating a low fat and reduced red meat diet, high in fruit and vegetables, while the risk of developing bowel cancer is reduced by having a healthy diet and taking regular exercise.
The society's chief executive, John McCormack ,said: "We're not asking men to go on extreme diets or become athletes overnight - it can be as simple as making small changes in what you eat and putting a bit more energy into every day activities.
The Irish Cancer Society is running a roadshow this week in Dublin, Galway and Cork to discuss lifestyle improvements to reduce the risk of cancer.
A weight management leaflet is available from GPs and pharmacists. Men or women can call the cancer helpline on 1800-200700 for more information and advice.