Conclusion: Yogurt that has expired for seven days is not recommended because of serious safety concerns. Although some people believe that expired yogurt is just an increase in fermentation, in fact, expired yogurt has the following major problems:

First of all, the active probiotics in the yogurt will be greatly reduced or die after the expiration date, losing the ability to regulate intestinal function, and failing to play the proper health benefits.

Secondly, although the calcium and protein components of expired yogurt are relatively stable, consuming expired food, especially yogurt that has not been adequately sterilized, may lead to an imbalance in intestinal flora, triggering abdominal pain and diarrhea, and in severe cases, may even lead to food poisoning, which is a threat to life and health.

For room-temperature yogurt, due to its high-temperature sterilization, live bacteria are almost lost, and it often contains high sugar, which is not suitable for diabetics and weight-loss people. Even room-temperature yogurts that claim to be low in lactose don't actually meet the standard, and those who are lactose intolerant need to be more careful in choosing them.

Therefore, in order to protect your health, yogurt that has expired for seven days should be avoided, especially refrigerated yogurt, and it is best to choose fresh products to ensure food quality and nutritional value. Reference source: People's Daily Online - room temperature yogurt and refrigerated yogurt