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Original Research Communications |
Background: The increasing prevalence of overweight and obesity is a major public health concern in many developed countries.
Objective: We aimed to describe socioeconomic differences in change in body mass index (BMI; in kg/m2) from age 25 y, assess possible factors behind these differences, and study whether socioeconomic differences in a variety of coronary risk factors can be accounted for by change in BMI.
Design: The data come from a cohort study of London-based civil servants (Whitehall II), who participated in the first (19851988) and third (19911993) phases of the study and were 3555-y old at phase 1; altogether there were 5507 men and 2466 women. Both study phases included a questionnaire and a screening examination.
Results: In men and women, employment gradethe measure of socioeconomic status used in this cohortwas strongly related to BMI gain from age 25 y to phase 3 (25 y apart on average). The lower the grade the larger the gain in BMI. Adjustment for health behaviors reduced the grade differences in BMI gain by
20%. A substantial part of the grade differences in diastolic and systolic blood pressure and plasma triacylglycerol concentrations could be accounted for by BMI change from age 25 y.
Conclusions: Grade differences in BMI change are evident, but many of the determinants of these differences remain unknown. If lower-status persons continue to gain weight more rapidly than higher-status persons, overweight is likely to be of growing importance as a pathway to social inequalities in ill health.
Key Words: Weight gain body mass index socioeconomic status coronary risk factors London civil servants overweight
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