Comparison of body mass index range criteria and their association with cognition, functioning and depression: a cross-sectional study in Mexican older adults.

BMI and its associations to relevant outcome measures in the older adults must rely on criteria that take into account the particular features of this population, such as the CDH criterion. Underweight was associated with decremented cognition, less independent physical functioning and more depression. Overweight seemed favourable for women but unfavourable for men.