What diet is needed before a colostomy or an ileostomy?

Liquid diet: For a procedure on the GI tract, the less food content in the bowel at the time of surgery, the easier for surgery to be performed. With colostomy and ileostomy the stoma is created on the abdominal wall in the absence of a needed anastomosis so that there is no problem with food products having to cross an early created anastomosis. A liquid diet prior to this surgery is helpful.