Men who eat cheese may risk chance of becoming dad

London: Young men who eat more than three slices of cheese a day may be risking their chances of becoming fathers, a new Harvard study has claimed. Researchers discovered that even small amounts of full-fat dairy food can dramatically impair fertility in men.      They found that men who eat even three portions of cheese a day had poorer quality sperm compared to others, the 'Daily Mail' reported. A portion includes 28 gm of cheese, a teaspoon of cream, a scoop of ice cream or glass of full-fat milk.      Researchers believe that female hormones that occur naturally in milk may be interfering with men's ability to reproduce.      Scientist from the Harvard School of Public Health in the US compared the diets of 189 men aged 19 to 25, all very fit and did at least one and a half hour's exercise a week.      They filled in a questionnaire, answering how often they ate dairy products, fruit, meat and other types of food during a typical week.      Researchers also looked at their sperm quality, including how fast it travelled and its shape. They found that the sperm of men who ate more than three portions of full-fat dairy food a day was of 25% poorer quality than those who had less. PTI