Yes it's OK to eat apple on empty stomachs.
You can eat an apple or apples at anytime during the day or night or whenever you're feeling hungry.
I like to have an apple in the morning when I wake up while I'm making my other breakfast.
The apple is a very healthy part of a breakfast and apples are a very healthy snack as well.
I keep apples at my desk as well and snack on them through the day while working from home.
The apple is usually better digested when you have something else in your stomach first but it's not harmful or bad to eat apples on an empty stomach.
Apples everyday is healthy as well because apples promote good digestive health, provide you with vitamins and minerals as well as nutrients.
Eating apples can help boost your immune system as well.
Just like the saying an apple a day will keep the doctor away.
Apples are a very healthy fruit.