The Portfolio Diet and Incident Type 2 Diabetes: Findings From the Women’s Health Initiative Prospective Cohort Study
Authors' conclusion
Greater adherence to the plant-predominant Portfolio, DASH, and Mediterranean diets was prospectively associated with lower risk of type 2 diabetes in postmenopausal women.
Study context
- Population
- Postmenopausal women free of diabetes at baseline, Women's Health Initiative (WHI) Clinical Trials and Observational Study, 1993–202113,943 incident T2D cases
- Participants
- 145,299 women
- Exposure
- Highest vs lowest quintile of adherence to the Portfolio Diet
- Outcome
- Incident T2D
- Follow-up
- Mean 16.0 years
Methodological detailsCox proportional hazards models, adjusted for potential confounders
- Cox proportional hazards models
- Adjusted for potential confounders
Main finding
As reported in the abstract
Highest quintile vs Lowest quintileHazard ratio (95% CI)
Portfolio Diet
0.77(0.72–0.82)
DASH diet
0.69(0.64–0.73)
Mediterranean diet
0.78(0.74–0.83)
Observational data: associations, not effects.
Further findings
Incident T2D, additionally adjusted for BMI
- Findings attenuated after additional adjustment for BMI
- 10%
Parts of this Brief are withheld: the automatic checks could not confirm them against the abstract.
Original publication
The Portfolio Diet and Incident Type 2 Diabetes: Findings From the Women’s Health Initiative Prospective Cohort Study. Diabetes Care. Published 26 September 2022. doi:10.
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