The question scientists are still trying to answer is the reason for the concentration of ‘twins’ in one area or country. Extensive studies on multiple births have been conducted, showing that yams contain the chemical gonadotropins, which helps women produce multiple eggs.
But while scientists are thinking about yam as the culprit, the locals are not in any doubt as to what causes them to produce so many twins. The answer to them is definitely “Yam”. The eating of Yam therefore could be the reason why Nigerians produce more twins that almost every other country.