Some researchers have argued that the ideal BMI range for older adults (specifically those over 75 years) should be shifted up to 23–25 kg/m2 to allow for body composition changes. Stevens J. has reviewed the evidence for this.

Is the patient already underweight? Assessed using BMI, where less than 20 kg/m2 shows an increased risk of malnutrition.

Some researchers have argued that the ideal BMI range for older adults (specifically those over 75 years) should be shifted up to 23–25 kg/m2 to allow for body composition changes. Stevens J. has reviewed the evidence for this.

(see Stevens J. , "Impact of age on associations between weight and mortality" . Nutr Rev 2000. 58129–137.137. [PubMed])

(See
Impact of age on associations between weight and mortality.

Authors
Stevens J.
Journal
Nutr Rev. 2000 May;58(5):129-37.
Affiliation
Department of Nutrition, School of Public Health, University of North Carolina, Chapel Hill 27514-4145, USA.)

Info source:

http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2563720/