Why do i have no appetite after endoscopy and colonoscopy?

Not uncommon : The prep can disrupt the normal flow of food and waste though the gastrointestinal tract. Try to resume as normal a diet as you can to replace the empty intestines. Until the bowels start functioning again, you may loose your appetite. Try some high fiber foods and even some Miralax (polyethylene glycol) if you need to get going again.