Abstract
Obesity has been associated with low 25-hydroxy-vitamin D (25OHD). The causes of hypovitaminosis D in obese individuals are not known. The present work aimed to investigate 25OHD in obese and normal-/overweight subjects with consideration of leisure-time physical activity (LTPA). Community-dwelling old adults (N=229, 73.7±5.7yrs, 58.2% female) from the Reykjavik capital area in Iceland participated in this cross-sectional study. LTPA, vitamin D intake, body composition and background variables were assessed. 25OHD was measured in fasting blood samples. Mean LTPA was 5.7±5.6h/week and the common activities were walking and gardening. Mean 25OHD was 66.7±28.1nmol/L and 8.5/21.2% were below 30 and 50nmol/L, respectively. Obese participants (n=84) had lower 25OHD (-11.0±3.8nmol/L,P<0.001) and lower LTPA (-2.5+0.8h/week,P=0.001) than normal-/overweight subjects (n=145). Linear models showed that LTPA (h/week) was associated with higher 25OHD in normal-/overweight participants only (1.3nmol/L, P<0.001) but not in obese (-0.7nmol, P=0.245). Fish oil intake was associated with higher 25OHD both in normal-/overweight (19.2±4.5nmol/L, P=0.001) and obese subjects (13.4±5.3nmol/L, P=0.013). Obese community-dwelling old adults in Iceland have lower 25OHD than their normal-/overweight counterparts. LTPA was associated with a higher 25OHD in normal-/overweight, but not in obese participants. However, fish oil was associated with higher 25OHD independently from obesity status. Thus, vitamin D supplementation is important for obese old adults to maintain vitamin D levels.
Published Version
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