The US potato industry brings in US$240 million annually, and demand for taters in all their wonderful processed shapes and sizes is year-round. As such, a certain amount of stock in season is sent to cold storage to supply the demand. However, thanks to a normal biological function in the root vegetable, low temperatures trigger a mechanism that converts starches to sugars. When processed, these tubers that have experienced cold-induced sweetening (CIS) appear darker when cooked.
Unfortunately, it’s more than potato-skin deep, as this darkened chip is a crispy red flag – it indicates elevated levels of acrylamide, a chemical that has been associated with increased cancer risk due to its carcinogenic properties.
Acrylamide is a nasty neurotoxin. Look at old protein biochemists and their hands all shake from years of making SDS-PAGE gels without gloves.