Does black coffee break a fast?

A 240 ml (8 fl oz) cup of brewed black coffee has about 2 kcal, with no sugar and no protein. A 30 ml espresso shot has about 3 kcal, and instant coffee made with water has about 2 kcal per 100 ml. Americano, filter coffee, cold brew and pods all count as black coffee when nothing goes in the cup.

This site sorts each answer by four goals of its own: weight loss, blood sugar, autophagy and gut rest. Black coffee is safe for the first three. The autophagy verdict rests on mice, where regular and decaf coffee raised autophagy within 1 to 4 hours. No human study has tested it. Gut rest is grey, because coffee raises stomach acid and gets the bowel moving.

Caffeine sets the limit on how many cups you drink. Healthy adults can have up to 400 mg a day, and a cup of brewed coffee has about 95 mg. In pregnancy or while breastfeeding the limit is 200 mg a day. If you take levothyroxine, take it as prescribed, 30 to 60 minutes before any coffee.