Hi, Thanks for writing in. Large intestine is called as colon. Therefore large intestine cancer is the same as colon cancer. As with any cancer, there is extra growth within the large intestine of irregular thickening of its wall. This causes symptoms of blood in stools and altered bowel habits. Your mother in law has undergone surgery to remove part of the colon. It is not clear what stage of cancer she has. The colostomy bag is put in place either temporarily for a short duration and soon afterwards the other end of normal colon is attached back. In rare cases the colostomy is permanent and the patient passes waste in to the bag. Ensure plus is a nutrition supplement containing proteins and vitamins You can safely give her Ensure Plus in normal adult recommended amounts everyday. It will benefit her recovery. Please do not worry.