Senior cat nutrition: what changes after age 10

A cat's nutritional needs shift significantly as they enter their senior and geriatric years. The biggest mistake is assuming that a healthy adult cat food works for a 13-year-old — it often does not, and the mismatch contributes to the very diseases common in older cats.

What changes in senior cats' bodies

- Reduced digestive efficiency: cats over 12 become less able to absorb fat and protein from food, even with a healthy gut. This causes muscle wasting (sarcopenia) even in cats that appear to be eating normally.
- Reduced kidney function: gradual decline is near-universal in older cats. Kidneys become less able to concentrate urine and process waste.
- Altered energy requirements: many senior cats need more calories per kg (because of reduced absorption), but some overweight cats need careful caloric restriction — there is no "one size fits all."
- Reduced thirst sensation: older cats often become less sensitive to thirst, increasing dehydration risk.
- Dental disease: affects most cats over 10, making harder food more difficult to eat.

Key nutritional priorities for cats over 10

High-quality, highly digestible protein

This is the most important change. Older cats need more protein than adults, not less — despite the old dogma that senior cats should eat low-protein food. Muscle wasting in senior cats is driven largely by insufficient protein intake and reduced absorption efficiency. Aim for a food with a high-quality animal protein (chicken, turkey, salmon) as the first ingredient.

The exception: cats with confirmed kidney disease (CKD) need moderately restricted, high-quality protein alongside strict phosphorus reduction. This is a specific medical diet — do not restrict protein in a healthy senior cat preemptively.

High moisture content

Wet food is strongly preferred for senior cats for two reasons: better hydration (reduces kidney strain) and often easier to eat (especially for cats with dental disease). If feeding dry food, encourage water intake with a pet water fountain — cats drink significantly more from moving water.

Phosphorus awareness

Even before CKD is diagnosed, many vets recommend a food with moderately controlled phosphorus for cats over 10 as a preventive measure. Check the phosphorus content on the food label.

Omega-3 fatty acids

EPA and DHA (from fish oil) have anti-inflammatory properties that benefit joints, kidneys, and cognitive function. Many senior cat foods include these; a separate supplement can be added to any food.

Practical feeding tips for senior cats

- Warm food slightly to enhance aroma and palatability — smell-driven appetite declines with age
- Offer smaller, more frequent meals if appetite is reduced
- Weigh monthly and track with Flovvi — weight loss in a senior cat is never just "getting old"
- Transition new foods slowly (over 2–4 weeks) to avoid GI upset