it's specific types of yams (like Yoruba). Most of these yams are imported from
Asia or
Africa. Eating them (or buying the dried stuff and taking it like a pill) totally works, but it's crazy expensive.
However, you can get some of the yams in the imported section of the store.
I also do not recommend TTC while overweight, but I am currently pregnant and (unfortunately) obese technically. I am far more worried about diabetes than Autism.