 In the U.S., the FDA has banned import of any donor sperm, motivated by a risk of variant Creutzfeldt-Jakob disease, inhibiting the once popular import of Scandinavian sperm.Despite this, the scientific consensus is that the risk is negligible, as there is no evidence Creutzfeldt–Jakob is sexually transmitted.Eating other types of brains such as those from squirrels is not recommended due to potential concerns.