May we have exemptions during a fast?

– May I have kefir (a dairy product) during a fast, as I have a sore stomach? It helps me a lot, otherwise, I have heartburn. I asked our parish priest, but he only shrugged his shoulders. I asked, “So, I should not violate the fast?” But he never answered.    

– You  better address your spiritual guide. He might know about your health and will bless you to loosen your fast in this relation. If you do not have a spiritual guide, then loosen your fast yourself, according to your health condition. 

Archpriest Sergiy Baranov