The older that such fish become, the more mercury they may have absorbed. Anything that eats these fish within the food chain also consumes the higher level of mercury that the fish have accumulated. This process explains why predatory fish such as swordfish and sharks or birds like osprey and eagles have higher
The goal, then, when it comes to having a boy is to increase the likelihood that a Y chromosome sperm reaches the egg first. Many medical researchers believe that Y chromosome sperm are faster swimmers, but that X chromosome sperm have more endurance.
From my research on alcohol and fertility, Iâve learned that timing your intercourse to increase the chances of getting pregnant is more effective than not drinking an occasional glass of wine or other alcoholic beverage.lcohol and fertility can be connected before a man is born â and drinking affects getting pregnant for future generations. Marijuana use affects male fertility. Young men who use cannabis may be putting their fertility at risk, because marijuana affects the size and shape of sperm.