What Food and Supplements Does My Senior Cat Need?

Cats are generally classified as mature from age 7–10 and senior from 11+, though indoor cats often live to 15–20. The transition is gradual, but metabolic changes begin earlier than most owners realise.

Key changes in senior cats:

• Decreased metabolic rate — lower calorie needs but higher nutrient density requirements
• Reduced ability to digest protein and fat efficiently
• Declining kidney function (the leading cause of illness in older cats)
• Decreased muscle mass (sarcopenia)
• Less efficient immune system

These changes mean that feeding the same food at the same amounts is no longer appropriate. A proactive dietary shift can genuinely extend your cat's healthy years.

Higher-Quality Protein

Contrary to the old advice of reducing protein for seniors, current veterinary nutrition science recommends increasing protein quality (though not necessarily quantity) for older cats. Senior cats need highly digestible animal protein to maintain muscle mass.

Controlled Phosphorus

Excess phosphorus accelerates kidney disease progression. Senior cat foods typically have reduced phosphorus levels compared to adult formulations — a critical difference for kidney health.

Increased Moisture

Senior cats are prone to dehydration. Switching from dry-only to wet food or a combination increases water intake and supports kidney function. Consider adding a cat water fountain to encourage drinking.

Calorie Adjustment

Some seniors gain weight from reduced activity; others lose weight from declining digestion. Monitor body condition regularly and adjust portions accordingly — body condition scoring principles apply to cats too.

Always consult your vet before starting supplements. That said, several have strong evidence for senior cats:

• Omega-3 fatty acids (EPA/DHA) — from fish oil, supports joint health, kidney function, and cognitive function. One of the most well-evidenced supplements for senior pets
• Glucosamine and chondroitin — supports joint cartilage, particularly helpful for cats with early arthritis (learn more about managing arthritis)
• Probiotics — supports declining digestive efficiency and immune function
• Vitamin E — antioxidant support for immune health
• Cobalamin (B12) — senior cats often develop B12 deficiency, which affects appetite and energy

"I recommend omega-3 supplements for almost every senior cat I see. The evidence for kidney support alone makes it worthwhile." — Dr. Jo Myers, DVM

• Smaller, more frequent meals — 3–4 small meals instead of 2 large ones aids digestion
• Warm the food slightly — enhances aroma for cats with declining sense of smell
• Elevate food bowls — reduces neck strain for arthritic cats
• Offer variety — appetite often fluctuates; rotating flavours prevents food fatigue
• Monitor water intake — increased drinking can signal kidney disease or diabetes (read about diabetes management)

Nutritional changes can only do so much. See your vet promptly if you notice:

• Unexplained weight loss or weight gain
• Increased thirst or urination
• Appetite changes — eating more or less than usual
• Vomiting or diarrhoea lasting more than 24 hours
• Dull coat, excessive shedding, or flaky skin

Senior cats should have veterinary wellness checks every 6 months, not annually. Many conditions (see our senior care guide) are far more treatable when caught early.