The relevance of healthy diets for the prevention of frailty and cognitive impairment
The positive effects of healthy diets in older populations may still not be adequately appreciated by many healthcare professionals, especially as some of the respective trials have been criticized for methodological reasons. For example, a double-blind study design will never be realized in this kind of trials and certain diets may be considered to express also a specific attitude toward life whose relevance for study outcomes cannot be distinguished from the effects of the diet. However, data are accumulating that show beneficial effects of healthy diets on cognitive function, strength, and mobility in older persons. Certain key ingredients like amino acids, polyunsaturated fatty acids, and certain micronutrients have been proven to be of special relevance in this regard, whereas the importance of secondary phytonutrients may still be underestimated.