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The Impossible Burger is a plant-based burger, with a key ingredient of protein called soy leghemoglobin (SLH for short), derived from genetically modified (GM) yeast. It’s already being sold in restaurants and supermarkets in the US. However, the results of a rat feeding study commissioned by Impossible Foods and carried out with SLH suggest that the burger may not be safe to eat. Rats fed the GM yeast-derived SLH developed unexplained changes in weight gain, changes in the blood that can indicate the onset of inflammation or kidney disease, and possible signs of anemia. The he FDA issued a “no questions” letter which is not an assertion by the FDA that the food is safe, but that the company is responsible for the safety of the food. The FDA does not protect...