The heavy weight body tended to have fewer sperm if  compared with the man with the normal weight. This results of the study was released in the journal of  Fertility and Sterility. 
"There were strong relations between the heavy weight as well as  obesity and the sperm change parameter," said the leader of  this research, Dr Ahmad O Hammoud from the Utah University, Salt Lake  City, the USA. 
The obesity have the potentiality damaged of the man fertility, said the  researchers, whereas the increase in excessive fat could reduce the  production of testosterone and increased the production of oestrogen in  the man's body. 
To study how the index of the body mass affect the quality of  sperm, they researched 390 men who underwent the maintenance of the  fertility with their couple for the period two years. 
Totalling 24% the man had heavy normal, whereas 43% had the weight  surplus, and 33% obesity. From this research was found, the fat man only had a third of the  weighing number of the man's sperm with normal body. "Apart from the quantity, there was the possibility that the weight and  the pile of  fat could be affect in the  sperm quality"  said Hammoud. (*/Xinhua/X-8)