The obesity paradox in diabetes

Area of Science:

• Endocrinology
• Metabolic Disorders
• Epidemiology

Background:

• The obesity paradox describes a survival advantage in overweight or obese individuals compared to leaner ones.
• This phenomenon is counterintuitive and has been observed in general populations.
• Evidence for the obesity paradox in patients with diabetes mellitus is inconsistent.

Purpose of the Study:

• To review and synthesize evidence on the association between obesity and survival in patients with diabetes.
• To evaluate the consistency of the obesity paradox in diabetes populations.
• To identify gaps in research regarding mechanisms and management strategies.

Main Methods:

• Systematic review of 18 longitudinal studies.
• Inclusion of data from cohort studies, patient registries, and clinical trial populations.
• Analysis of associations between body mass index (BMI) categories and mortality outcomes in individuals with diabetes.

Main Results:

• The majority of reviewed studies indicated that overweight and obese individuals with diabetes had the lowest mortality rates.
• Leaner adults with diabetes exhibited the highest relative total and cardiovascular mortality.
• These patterns were more pronounced in older adults (age > 65 years).

Conclusions:

• The obesity paradox may be relevant for some populations with diabetes, particularly older adults.
• Leaner individuals with diabetes appear to have an elevated mortality risk.
• Further research is needed to elucidate mechanisms and develop strategies for managing this risk.