Profoundly — but through quantity more than brand. The landmark lifetime study in Labradors found dogs fed 25 percent less lived a median 1.8 years longer with delayed chronic disease. Leanness is the most evidence-backed dietary intervention in canine longevity.
What the evidence supports
- Keep them lean: ribs felt, visible waist. The single biggest lever.
- Complete and balanced: AAFCO-profiled food beats boutique guesswork for baseline nutrition.
- Protein adequacy for seniors: older dogs need more, not less, quality protein against muscle loss.
- Fresh-food toppers: promising but unproven for lifespan; fine as enrichment within calorie budget.
What to ignore
Miracle ingredients, raw-magic claims, and age-reversing kibbles all outrun their data. No diet changes chronological age; good feeding slows biological aging through weight and inflammation. Track condition monthly and let the dog age calculator frame which life stage you are feeding for.
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