Have been taking kefir for 2 weeks now ( half a glass a day) and for the last two days I have felt awful. A bit nauseous, and light headed and very tired. Can it be the kefir, or is it a bug? Any suggestions welcomed.

Best person to consult is your family doctor. Your medical history and any ‘signs’ (temperature, heart rate, blood pressure, listening to your chest, etc.) may be taken into consideration when making a diagnosis.

Whether there is anything untoward with the kefir depends how it has been made and stored. Keep up with your detailed food and symptom diary (p.187), and share this with any health professional you consult.

Hope you feel better soon.