It is your body talking to you and warning you

It is your body telling you that you can not break a fast with an apple.

How long have you been fasting ?

Fibers in apple may irritate your stomach.

Try just some freshly squeezed juice next time. You can also juice things with your mouth, suck the juice and spit out the fibers. Fibers can be like a stone inside a stomach after a long fast.

Also, eating a whole apple at once can be too much, simply too big quantity for a first meal.

The best way to break a fast is just small amount of fresh juice or fresh veg. soup.

WS