Lay opinion vs evidence: Kefir Alltag

Kefir is often promoted as a universal superfood that revolutionizes gut health, boosts immunity, and even enhances mental well-being. The scientific reality is more nuanced. Kefir contains a complex mix of lactic acid bacteria, yeasts, and bioactive peptides. Human studies show moderate effects on lactose digestion, mild improvements in gut flora composition, and possible anti-inflammatory benefits. However, many lay claims are exaggerated: kefir is not a substitute for a balanced diet, and effects vary greatly depending on production method, consumption amount, and individual microbiota. For healthy individuals, daily kefir is safe, but those with immune deficiencies or serious gastrointestinal conditions should consult a doctor before regular intake. The evidence is moderate – there are positive indications but no miracles. A critical view of marketing claims remains essential.