Please choose the correct ending to complete the given sentence: Health: [header] How to do a liver flush [title] Consider fasting before your liver flush. [step] Do this only if you have experience with fasting. The liver flush itself can cause nausea, diarrhea, or vomiting.

Ending1: Fasting may produce both nausea and vomiting. Fasting may irritate your colon, which may cause you to pass the urge to flush. Ending2: If you're not used to fasting, these effects may be amplified. [substeps] If you are an experienced faster, consider doing a three to seven day juice fast before the liver flush. Ending3: [substeps] Fasting can cause serious problems to younger children and the elderly. Even if your child has had acute liver disease or similar issues, having one day of fasting can help minimize the symptoms and prevent inflammation. Ending4: During the fasting period, you shouldn't feel much nauseated and you may have less blood in your stool. However, fasting can make your digestion and stomach upset.

Answer format: ending1/ending2/ending3/ending4