Coffee ☕ and fasting

Question, I wake up every evening and start my cardio by walking to Starbucks which is about 40min away from my house. Once I get there I order a plain black coffee (large) and sit there to enjoy it and then walk another 40min back home. My fasting prolongs until night time but my question is, is the coffee affecting the benefits of fasting? Does plain black coffee break a fast? via /r/intermittentfasting https://ift.tt/bRid9uL https://ift.tt/9k8oRVg