Obesity Affects the Association of Bioelectrical Impedance Phase Angle With Mortality in People Living With HIV.

This was a retrospective analysis of electronic medical record data, not a randomised intervention study. Patients at higher risk for malnutrition were more likely to have extra phase-angle assessments, so the sample may include more medically complicated patients than a general HIV population. Measurements were taken during routine clinical visits, so some patients may not have followed advice to avoid moderate or vigorous exercise or excessive fluid before testing. The sample was underpowered to analyse separate BMI categories within obesity, although 48% of participants were overweight or obese. BIA is less accurate at extreme body weights, and obesity can change fat mass and hydration, which may affect phase angle. Few patients had cirrhosis, cancer or acute infection, so the effect of those diagnoses on phase angle could not be examined well.

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Do not read a falling phase angle as a mortality warning for every patient living with HIV. In this cohort it was linked to higher death risk only in underweight and normal-weight patients, not in overweight or obese patients.