Diet patterns, dementia burden and environmental footprints in 185 countries, 1990–2018
In a country-level ecological analysis of 185 countries (1990–2018), a higher modified Planetary Health Diet Index was associated with a lower dementia DALY rate 10 years later, lower greenhouse gas emissions and land use, but greater water scarcity. Mediterranean and DASH diets showed no association with dementia burden. [1]
Automatic summary · not editorially reviewed
The key findings
The source at a glance
- Study type / format
- Longitudinal ecological analysis (country-level), 1990–2018.
- Population / context
- Older adults worldwide, analysed at the level of 185 countries and territories, 1990–2018.
- Summary based on
- Study abstract
- Original publication
- October 16, 2026
Do diet patterns link to dementia and environment?
As populations age and food systems face pressure, diets should ideally support both brain health and the environment. The researchers asked whether four established dietary patterns are associated with both a lower dementia burden and smaller environmental footprints among older adults worldwide. This question was previously unclear.
Supporting source [1]
Country-level data from 185 countries, 1990–2018
This was a longitudinal ecological analysis of 185 countries and territories at seven time points between 1990 and 2018. Data on diet came from the Global Dietary Database and were linked to dementia estimates from the Global Burden of Disease and to environmental footprints from life-cycle assessment. The models examined dementia burden 10 years later alongside concurrent environmental footprints.
Supporting source [1]
mPHDI linked to lower dementia DALYs, not prevalence
A 10-point higher modified Planetary Health Diet Index (mPHDI) was associated with a 1.32% lower dementia disability-adjusted life-year (DALY) rate 10 years later, but not with dementia prevalence. Mediterranean diet and DASH were not associated with dementia burden. Higher mPHDI, DASH and AHEI were associated with lower land use, and mPHDI with lower greenhouse gas emissions. All patterns were associated with greater water scarcity. These are associations at country level, not proof of cause, and the abstract was reviewed, not the full text.
Supporting source [1]
How to interpret this
Abstract only; the full text was not reviewed. This is a country-level ecological analysis, so group-level associations cannot show that a diet causes or prevents dementia in individuals. Findings are associations, not causal effects.
Based on the study abstract; the full paper, tables and supplementary data were not reviewed.
Source & supporting passages
Sheng Y, Di K, Chi H, Li C, Huai B, Liu D. · europepmc.org · October 16, 2026