Persian Cat Weight Loss on Senior Food

Weight loss after switching to a senior food is a real red flag — especially in a 13-year-old Persian, where dropping condition can snowball quickly. Cats are obligate carnivores with precise nutritional needs, and many senior formulas overcorrect on protein restriction in ways that actually cause muscle wasting rather than prevent it. Wet food is almost always the better call at this age, both for palatability and kidney hydration. To point you in the right direction: is your Persian male or female, and has a vet ruled out anything underlying like hyperthyroidism, kidney disease, or dental pain? And what's the food you switched to three months ago?

400g on a Persian is significant — that's potentially 10–15% of her body weight. James Wellbeloved Senior is a decent food in principle, but dry food for a 13-year-old is working against you on two fronts: it's much lower in moisture, which puts quiet strain on ageing kidneys, and senior dry formulas are often lower in protein than an older cat actually needs to maintain muscle mass. The good news is clean bloodwork means you have time to reverse this before it becomes a real problem. What are you feeding alongside the dry, if anything — any wet food or toppers at all?

Even with a fountain, dry-only cats are chronically under-hydrated compared to wet-fed cats — it's just how their physiology works. And Persians in particular can be fussy about wet food texture, which is probably why she went off it before. The key is finding the right format. My recommendation is Royal Canin Persian Senior wet food in the loaf format — it's specifically formulated for the Persian breed, higher in protein than most senior dry foods, and the texture and aroma are designed for cats that have been picky about wet food in the past. It also supports coat and digestive health, which matters for long-haired breeds. I'd switch her to this as her main food and phase out the James Wellbeloved over about a week. Has she shown any preference for particular textures or flavours in the past — pâté, chunks, gravy?

For a Persian her age who needs to regain weight, I'd start at the upper end of the Royal Canin feeding guide for her target weight — not her current weight. If she should be around 3.5kg and she's now sitting at 3kg, feed as though she's 3.5kg. Split it across two meals, morning and evening. You should start to see her interest pick up within the first week if the food suits her, and genuine weight gain within three to four weeks. If she's not gaining after a month of consistent eating, go back to the vet — sometimes a clean panel misses early hyperthyroidism on first pass and it's worth repeating. But my bet is this is a food issue, not a medical one.

Go fully wet for now. Once she's back to a healthy weight and eating well, you could introduce a small amount of Royal Canin Persian dry as an occasional topper or enrichment scatter — but it shouldn't be the base of her diet at 13. Wet food as the foundation is the right long-term call for her kidneys and her weight stability. Good luck with her — at her age, catching this and acting on it promptly is exactly the right thing to do.