If you're thinking of starting a family, it may be time to cut back on the hot dogs and fries, as a new study has found that eating too much fatty food can lower a man's sperm count.
Men who ate the most fatty foods had the lowest sperm counts compared with those who ate the least, researchers from Harvard Medical School found.
But the study also found that men who ate healthier foods with more omega-3 fatty acids, the type of fat often found in fish and plant oils, had more and "better formed" sperm.
Harvard researchers questioned 99 men about their diet and analysed their sperm samples over a four year period.