“It’s quite striking that, despite the industry's drive to become more responsible, it often neglects one of the most basic needs of its female guests,” says Affi Parvizi-Wayne, founder of Freda, a London-based eco-conscious period care company.

Importantly, they found maternal and paternal exposures influenced timing, but it was the father’s contribution that stood out. “While we found that both the mother’s and father’s exposures were linked to when their daughters and granddaughters began puberty, the father’s influence was surprisingly strong,” Hu said.

Wondering why your period smells stronger than usual? Learn what’s normal, what may signal a problem, and how to manage odor with confidence.

Set in the 1930s, a new six-part BritBox series tells of the infamously non-conformist Mitford sisters, whose involvement in various political causes roiled their aristocratic parents.

The BBC series was created and written by Debbie Horsfield and was based on Winston Graham's novel series of the same name. Rivals star Aidan Turner plays the lead in this period drama alongside Eleanor Tomlinson, Luke Norris, Harry Richardson, Gabriella Wilde, Tom York, Jack Farthing and Heida Reed.