Ketones
Ketones
Insufficient supply of blood to the brain can cause fainting (syncope) or a more severe loss of consciousness.
Anything that enters the human body while you are fasting breaks your fast.
That would be the brain.
Regular medications should be okay while fasting. Check with your doctor.
NO, You can't chew gum while fasting. As soon as you chew a gum while fasting your fast will break. But, if you're in fast for weight loss then if you think that gum helps you then you can go for it.
When you are fasting you can not eat anything or drink.
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Yes, of course. urinating doesn't break fasting.
coffee
No
When fasting, you cannot eat any solid foods. Most people fasting only drink. Broth, tea and vitamin water are three things you should consume while fasting.