Clear liquid diets are usually given to people to do about 24-48 hours before a procedure. A clear liquid diet can be prescribed for things like scans, blood work, imaging, endoscopy, colonoscopy, or prepping for surgery. All of these require figuring out how to manage hunger & appetite while eating only clear liquids. This is the most helpful and in-depth explanation! 

Chronic illness diagnosis story. It took a long time to be diagnosed but once I was I began a huge rollercoaster of hospital stays and surgeries. I was misdiagnosed for years because teenage girls with stomach pain are usually constipated or have acid reflux or an ulcer. It took forever to be diagnosed even though it is familial. I was super sick and so thankful for some answers.