Patients who are unable to consume enough nutrients to support life can easily consume nutritional supplements to keep them up to where they need to be.
 
 
Recommended Resources
Dietary Advice for Illness-Related Malnutrition in Adults
This article addresses the fact that when people are sick, they eat less than normal, and how oral nutritional supplements work to assist those people in keeping up their health.
http://www.cochrane.org/reviews/en/ab002008.html
Effects of Oral Nutritional Supplement Enriched with Fish Oil on Pancreatic Cancer
Contains the abstract as well as the full text of this article, which details the study of how oral nutritional supplements which are enriched with fish oil work to stabilize weight in patients who are suffering from the weight loss inherent with advanced pancreatic cancer.
http://www.ncbi.nlm.nih.gov:80/pmc/articles/PMC2374349/
Effects of Oral Nutritional Supplements
Examines a clinical trial which was meant to find the effects of nutritional supplements on geriatric patients who were either undernourished or well-nourished after they had hip surgery. also supplied on this site are the full text in html as well as PDF format, an opportunity to ask for alerts when the article is cited in other articles or if a correction is posted.
http://pen.sagepub.com/cgi/content/abstract/32/2/120