Sarcopenia, which is defined as a decrease in skeletal muscle mass and strength with aging, is an important risk factor in clinical medicine that is associated with mortality, and poor surgical and nonsurgical outcomes. Sarcopenia is now recognized as a multifactorial geriatric syndrome. Cachexia is defined as a metabolic syndrome with inflammation as the key feature, so cachexia can be an underlying condition of sarcopenia. Recently, cachexia has been defined as a complex metabolic syndrome associated with an underlying illness and characterized by the loss of muscle mass with or without a loss of fat mass. These two conditions overlap but are not the same. In clinical practice, many factors related to sarcopenia (decreased food intake, inactivity, and decreased hormones) are reported frequently in patients with cachexia. On the contrary, systemic inflammation, the core feature of cachexia, can also be present in apparently healthy older sarcopenic patients. This suggests that new therapeutic approaches, alone or in combination, may be appropriate in both conditions.

Intestinal failure (IF) is a condition, in which the intestinal function or length remaining is below the minimum amount required for the absorption of sufficient nutrients and fluid to maintain normal life. The nutritional supply of IF depends on the anatomical site, length, and function of the remaining bowel. The goals of nutritional therapy for patients with IF are to achieve bowel adaptation to absorb nutrients sufficiently to live a healthy life with the current intestinal condition, and to promote the enteral autonomy to control nutrient digestion, absorption, excretion, and bowel movement. To stabilize and recover the patient’s nutrition condition after a huge bowel resection, the intestinal rehabilitation team (IRT) for individual nutritional therapy should be established. IRT carefully monitors the changes in body weight, medication use, patient’s symptoms, nutrient deficiency, hydration status, function of the remaining bowel, degree of bowel adaptation, adverse effects due to nutritional therapy, and enteral balance. To achieve intestinal adaptation and enteral autonomy through complicated and difficult nutritional intensive therapy in IF patients, it is essential to manage the patients through multidisciplinary collaboration involving physicians, pharmacists, dietitians, and nurses.