Higher levels of micronutrients (vitamins and minerals) in older adults are associated with a lower risk of frailty. Frailty is commonly defined by the presence of at least two of the following: low muscle strength, exhaustion, slow walking speed, and reduced physical activity.
A prospective, population-based study published in the Journal of Gerontology: Medical Sciences (2006; 61(6):594–599) examined micronutrient status in 766 women over the age of 64. Data were drawn from the Women’s Health and Aging Study I, which followed moderately to severely disabled, community-dwelling women in Baltimore, Maryland. Plasma levels of vitamins A, D, E, B6, and B12, carotenoids, folate, zinc, and selenium were measured at baseline. Frailty status was assessed at baseline and during three annual follow-up visits. After adjusting for confounding factors, women with the lowest levels of carotenoids, alpha-tocopherol (vitamin E), or 25-hydroxyvitamin D had a significantly higher risk of becoming frail. The presence of multiple micronutrient deficiencies was associated with progressively greater frailty risk.
Similar findings were reported in another study published in the Journal of Gerontology: Medical Sciences (2006; 61(6):589–593), using data from the InCHIANTI (Invecchiare in Chianti) study. Nutrient intake was assessed using the European Prospective Investigation into Cancer and Nutrition (EPIC) questionnaire. Low protein intake and low caloric intake (less than 21 kcal/kg/day) were associated with frailty. In addition, low intake of vitamins D, E, C, or folate was linked to increased frailty risk. Individuals with low intake of three or more vitamins were significantly more likely to be frail.
Together, these studies suggest that inadequate intake of calories, protein, and key micronutrients is strongly associated with frailty in older adults, reinforcing the importance of overall nutritional status in maintaining strength, mobility, and functional independence with aging.
