New research led by scientists at the University of Bristol found that women whose paternal and great-grandfathers had started smoking before 13 years of age had higher chances to have higher body fat mass. The study, published in Scientific Records, closes a gap connecting the generational impacts of smoking to body fat. The scientists studied a cohort of more than 14,000 individuals (mostly males) born in 1991 and 1992 in the UK, along with their parents, for 30 years. The researchers highlighted that this was one of the first human studies with data suitable to start to look at these associations and to begin to unpick the origin of potentially important cross-generation relationships.