Mold-Affected Yam: Why Cutting Off the Bad Part Isn’t Enough — A Food Scientist’s Guide to Aflatoxin Safety
That small white or green patch on your yam? It’s not just surface dirt. It could be a serious food safety hazard. If you’re Nigerian or West African, yam is likely a staple in your kitchen. But there’s a hidden danger that most households don’t know about: Aspergillus mold and the aflatoxins it produces. And no, scraping off the visibly moldy part doesn’t make the rest safe to eat. As a food scientist, I want to break down what’s really happening at a microscopic level, and what you should do to protect your family’s health. What’s Actually Growing on Your Yam? The fluffy white, green, or black growth you see on cut yam is Aspergillus, a common environmental fungus. The most concerning species is Aspergillus flavus , which produces aflatoxins toxic compounds classified by the World Health Organization as Group 1 carcinogens. Here’s the part most people miss: what you see on the surface is only the “fruiting body” of the fungus. The real problem lies beneath. Fungal hyphae ...