Vitamin B12 deficiency in the elderly.

Area of Science:

• Gerontology
• Nutritional Science
• Gastroenterology

Background:

• Vitamin B12 deficiency impacts 10-15% of individuals over 60.
• Diagnosis relies on low serum vitamin B12 or elevated methylmalonic acid and homocysteine.
• Elderly often lack classical deficiency symptoms, yet require precise evaluation and treatment.

Purpose of the Study:

• To investigate the mechanisms of vitamin B12 absorption in the elderly.
• To highlight the importance of adequate vitamin B12 intake in older adults.
• To address concerns regarding folate fortification and vitamin B12 status.

Main Methods:

• Review of physiological changes affecting vitamin B12 absorption in aging.
• Analysis of the impact of atrophic gastritis on vitamin B12 bioavailability.
• Examination of dietary recommendations for vitamin B12 intake in the elderly.

Main Results:

• Crystalline vitamin B12 absorption remains intact in the elderly.
• Protein-bound vitamin B12 absorption is reduced in the elderly due to atrophic gastritis.
• Atrophic gastritis leads to reduced acid-pepsin secretion and potential bacterial overgrowth, impairing vitamin B12 release and absorption.

Conclusions:

• Elderly individuals are at risk for vitamin B12 deficiency primarily due to impaired absorption of food-bound vitamin B12.
• Recommended daily intake of vitamin B12 for the elderly should be met through supplements or fortified foods.
• Increased folic acid fortification necessitates attention to marginal vitamin B12 status to prevent potential neurological complications.