was ist bifidus joghurt — what are common causes?

The provided context does not contain information about bifidus yogurt or common causes. Bifidus yogurt is a probiotic dairy product containing Bifidobacterium cultures. Common reasons for consumption include supporting gut health, immune function, and alleviating digestive issues. However, scientific evidence for specific health benefits is limited and strain-dependent. Without relevant context, I cannot provide an evidence-based answer. For reliable information, consult current research or dietary guidelines.