Scientists from the University of Canada have conducted a research that has led them to think that a man's health habits may affect his grandchildren. More specifically, they studied proteins called histones, which are elements of sperm that are transported during fertilization. It is known that histones bind to DNA during cell formation so they could condense more efficiently to fit in a cell's nucleus.
In previous researches, it was found that alcohol and tobacco use can affect the health and development of the offspring even before conception. For example, in a study reported in Medical News Today, children with fathers that smoke are suggested to have an increased risk of asthma.