The "Association for affordable and quality food" in Bulgaria has discovered that many brands of "sheep's cheese" on the market actually contain cow's milk, with one popular product containing no buffalo milk at all. The association tested 10 types of Bulgarian sheep's cheese and yellow cheese and found that only one was made from sheep's milk alone. This discovery not only deceives consumers who pay a higher price for supposedly pure sheep's cheese but also poses health risks to those who buy the product for health reasons.