Unlike belly fat, gaining or losing fat around the hips didn’t seem to affect how likely women were to die or have heart disease over six years.
Scientific Claim
Changes in hip circumference over six years were not associated with mortality or cardiovascular disease risk in Nordic women.
Original Statement
“Recently it was shown that large hip circumference (HC), measured once, was protective against total and cardiovascular disease (CVD) mortality in women but that gain or loss in HC was unrelated to these outcomes.”
Evidence Quality Assessment
Claim Status
appropriately stated
Study Design Support
Design cannot support claim
Appropriate Language Strength
association
Can only show association/correlation
Assessment Explanation
The abstract uses 'unrelated to these outcomes', which is appropriately non-causal and consistent with observational design. No overstatement detected.
Gold Standard Evidence Needed
According to GRADE and EBM methodology, here is what ideal scientific evidence would look like to definitively prove or disprove this specific claim, ordered from strongest to weakest evidence.
Systematic Review & Meta-AnalysisLevel 1aWhether hip circumference change over time has no meaningful association with CVD or mortality across populations.
Whether hip circumference change over time has no meaningful association with CVD or mortality across populations.
What This Would Prove
Whether hip circumference change over time has no meaningful association with CVD or mortality across populations.
Ideal Study Design
Meta-analysis of 12+ prospective cohorts (n>40,000 women) with repeated HC measurements at baseline and 5–7 years, analyzing HRs for CVD and all-cause mortality, adjusting for WC, BMI, and lifestyle factors.
Limitation: Cannot rule out very small effects or effects in specific subgroups.
Prospective Cohort StudyLevel 2bIn EvidenceWhether hip circumference gain or loss over six years is truly unrelated to health outcomes in women.
Whether hip circumference gain or loss over six years is truly unrelated to health outcomes in women.
What This Would Prove
Whether hip circumference gain or loss over six years is truly unrelated to health outcomes in women.
Ideal Study Design
Prospective cohort of 10,000 Nordic women with HC measured at baseline and 6-year follow-up, followed for 15 years for CVD and mortality, with interaction tests against WC change.
Limitation: Cannot prove HC is irrelevant — only that no large effect was detected.
Cross-Sectional StudyLevel 3cWhether hip size at a single time point correlates with mortality risk (to contrast with change data).
Whether hip size at a single time point correlates with mortality risk (to contrast with change data).
What This Would Prove
Whether hip size at a single time point correlates with mortality risk (to contrast with change data).
Ideal Study Design
Cross-sectional analysis of 5,000 women with single HC and WC measurements, comparing mortality risk by quartiles of HC, adjusting for WC and BMI.
Limitation: Cannot assess change over time or directionality.
Evidence from Studies
Supporting (1)
The study looked at how changes in waist and hip size over six years affected health in Nordic women. It found that changing hip size didn’t affect risk of death or heart disease — which is exactly what the claim says.