Healthy Aging
Healthy aging is a multidimensional construct that extends beyond the absence of disease to encompass the preservation of cognitive, physical, and mental function into later life. The World Health Organization defines it as maintaining functional ability that enables well-being in older age.
Operational Definition (Tessier et al. 2025)
In the landmark 30-year prospective study by Tessier et al. (2025), healthy aging was defined as meeting all five criteria at age 70+:
- Survived to age 70 (by end of 2016 follow-up)
- Free of 11 major chronic diseases at baseline and throughout follow-up — including cancer, diabetes, myocardial infarction, stroke, kidney failure, COPD, Parkinson’s, MS, ALS
- Intact cognitive function — ≤1 of 6–7 subjective cognitive concerns on a validated questionnaire
- Intact physical function — not limited in stair-climbing, multi-block walking, basic ADLs (SF-36 physical subscale)
- Intact mental health — ≤1 depressive symptom on the 15-item Geriatric Depression Scale
Only 9.3% of 105,015 participants achieved this composite outcome across 30 years, highlighting how exceptional genuinely healthy aging is.
The Role of Diet
Diet is the first leading behavioural risk factor for noncommunicable diseases and mortality globally (GBD 2017). Tessier et al. demonstrated that dietary pattern adherence during mid-life is one of the strongest modifiable predictors of healthy aging in later life.
Dietary Pattern Rankings (Tessier 2025, OR Highest vs Lowest Quintile)
| Pattern | OR | What It Emphasises |
|---|---|---|
| AHEI | 1.86 | Chronic disease prevention; 11 components |
| rEDIH (reversed) | ~1.7 | Low insulin-stimulating foods |
| aMED | ~1.6 | Mediterranean foods (9 components) |
| DASH | ~1.6 | Hypertension prevention; sodium restriction |
| PHDI | ~1.6 | Planetary health diet (EAT-Lancet) |
| MIND | ~1.5 | Brain-healthy foods (15 components) |
| hPDI | 1.45 | Healthy plant-based foods |
The AHEI is the single strongest predictor. Using an age-75 threshold, its OR strengthens to 2.24 — participants in the top AHEI quintile are more than twice as likely to reach 75 as a “healthy ager.”
Foods Consistently Linked to Better Healthy Aging
Beneficial:
- Fruits (especially berries for cognitive health)
- Vegetables (especially leafy greens and dark yellow vegetables)
- Whole grains
- Unsaturated fats (especially polyunsaturated — strongest signal for physical function and survival)
- Nuts and legumes
- Low-fat dairy
Harmful:
- Trans fats — consistently negative across all five domains
- Sodium — consistently negative
- Red and processed meats
- Sugary beverages
- Liquor
Ultraprocessed Foods
Higher UPF consumption was associated with 32% lower odds of healthy aging (OR 0.68), with consistent negative associations across every domain. This is one of the strongest signals in the study.
Cross-Domain Effects
The AHEI leads specifically for physical function (OR 2.30) and mental health (OR 2.03). The PHDI performs best for cognitive health (OR 1.65) and survival to age 70 (OR 2.17), likely because of its environmental sustainability focus pushing toward high-vegetable, low-meat patterns.
Subgroup Nuance
- Associations are stronger in women than men for most patterns
- Diet’s protective effect is amplified in smokers and those with higher BMI — suggesting diet can partially compensate for other risk factors
- Associations are stronger in those with lower physical activity — exercise and diet are partially interchangeable levers
Practical Implications
- Mid-life diet matters — the study measured diet from ages ~39–69 and found effects on healthy aging at 70+, implying decades-long dietary exposure is the relevant window
- Patterns over foods — all eight patterns shared the same core beneficial foods (plants, unsaturated fats, whole grains) despite different emphases; no single food drives the effect
- UPF reduction is the clearest modifiable target — a 32% reduction in healthy aging odds is a strong, consistent signal across all domains
- Both Mediterranean and AHEI work — practical choice between culturally appropriate variants is valid
See Also
anti-inflammatory-diet | alternative-healthy-eating-index | mediterranean-diet | dash-diet | mind-diet | ultraprocessed-foods | nurses-health-study | walter-willett | frank-hu