Physicians' Academy for Cardiovascular Education

Obesity associated with high CV risk even in the absence of metabolic abnormalities

Transition from metabolic healthy to unhealthy phenotypes and association with cardiovascular disease risk across BMI categories in 90 257 women (the Nurses’ Health Study): 30 year follow-up from a prospective cohort study

Literature - Eckel N, Li Y, Kuxhaus O, et al. - Lancet Diab Endocrin 2018; published online ahead of print

Introduction and Methods

Obese individuals may or may not have metabolic disorders, and those who are obese but metabolically healthy, are considered to have an intermediate CV risk, which seems to increase over time [1,2]. On the other hand, there are non-obese individuals with metabolic disorders and a high CV risk [3]. It is not clear how metabolic risk factors change in different body mass index (BMI) groups over time, and how these changes impact CV risk.

In this analysis of the Nurses’ Health Study (NHS) [4], the association between metabolic health and CVD risk was evaluated across BMI categories. Metabolic health was defined by the absence of diagnosed diabetes, hypertension, and hypercholesterolemia. After excluding women with a history of cancer or CVD, as well as those who were underweight, and those with missing BMI data, a study sample of 90,257 individuals was secured. Health status was assessed every 2 years based on questionnaires. The endpoints of interest were fatal and non-fatal myocardial infarction and stroke, and their combination was named total CVD.

Main results

Conclusion

CV risk is very high for metabolically unhealthy women in all BMI categories. Obesity is a CV risk factor even when metabolic health is maintained during long periods of time. Most metabolically healthy women at baseline develop diabetes, hypertension or hypercholesterolemia in the long-term, independently of their BMI, which leads to an increase of their CV risk.

References

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