Are beauty and fertility linked?
There are some studies that link beauty and general health, and a few of them even correlate beauty with expected age at menopause, which would mean a longer reproductive potential. However, in both cases the evidence is far from strong, involving methodologically flawed studies (how do we assess beauty?), many of which have never been replicated.
Do worms cause infertility?
Recently, a study has shown that infection with intestinal helminths (worms) may affect fertility. The study was conducted on nearly 1,000 women of an indigenous population in Bolivia with a 70% helminth infection prevalence. The results varied depending on the kind of helminth involved, with those women infected by hookworm experiencing delayed first pregnancy and extended interbirth intervals while those infected by roundworm being having earlier first births and shorter interbirth intervals. The proposed physiological mechanism is the different immunological effect that follows infection by diverse species of worms.
Although there are no more studies that confirm these findings, the implications may be of relevance, especially in low- and middle-income countries, where helminth infection is more prevalent.