<prompt> True about TPNCarbohydrate forms about 40 of energy sourceIn abdominal injury early parenteral nutrition should be staedProteins forms 60 of energy sourceLipids form 20 of energy source  <response>: Calories from amino acid 20-25 lipids 20 dextrose 55-60 Abdominal injuries, we need not sta TPN unless we anticipate atleast 2 weeks of bowel rest. 