Cat Nutrition Through Every Life Stage: What to Feed, When to Change, and What to Ignore

Unlike dogs, cats cannot adapt their metabolism to a low-protein, plant-heavy diet. They are obligate carnivores — their bodies require nutrients that are only found in animal tissue, and they cannot synthesise several of them from plant precursors the way dogs and humans can.

Taurine is the clearest example. Cats cannot produce enough taurine from other amino acids. If their diet is deficient — which happens in improperly formulated home-cooked or vegetarian diets — they develop dilated cardiomyopathy and retinal degeneration. Both are irreversible by the time they become obvious. Arachidonic acid, vitamin A, and niacin follow the same pattern: dietary requirements that cannot be met by plants.

Commercial cat foods from reputable manufacturers account for all of this. Home-prepared diets very often do not. This is the foundational reason we are cautious about unformulated natural diets for cats — the margin for error is smaller than for almost any other species we see.

From weaning to 12 months, kittens need roughly double the calories of an adult cat per kilogram of body weight, alongside higher protein, higher fat, and specific micronutrients — particularly DHA for brain and visual development, and calcium and phosphorus in the right ratios for bone growth. Kitten food is formulated for all of this. Adult cat food is not.

Feeding a kitten on adult food for convenience can result in deficiencies that are not visible during kittenhood but compound over time. The reverse is also true: keeping an adult cat on kitten food for too long contributes to obesity, because kitten food is calorie-dense by design.

If you adopted a kitten without knowing its birth date: kittens under 6 months still have all their deciduous teeth and are visibly growing fast. By 6–9 months they are approaching adult size but still filling out. Most cats can transition to adult food at 12 months. Cats desexed early may benefit from transitioning slightly sooner, as desexing reduces metabolic rate and caloric needs. Transition over 7–10 days by mixing increasing proportions of adult food into the kitten food.

Adult maintenance covers roughly 1–10 years for most cats and is where gradual problems accumulate without obvious symptoms.

The most consistent issue we see is overfeeding, particularly with dry food. Free-feeding dry kibble — leaving a bowl topped up all day — is the single biggest contributor to feline obesity in our clinic population. Cats, despite the popular image of being indifferent, are food-motivated and will eat beyond their energy needs when food is constantly available. Two measured meals a day is better. It also means you notice immediately when your cat stops eating, which is a significant clinical sign.

The hydration question matters more in Dubai than in many other climates. Cats evolved in arid environments and have a low thirst drive — they are designed to get most of their water from prey. A mouse is around 70% water. Dry kibble is around 10%. In a city where air conditioning removes moisture from the air and cats spend most of the day indoors, chronic subclinical dehydration is common in cats on dry-only diets, and it quietly strains kidney function over years. We are not saying dry food is bad. Many cats do well on it. But if hydration is going to be borderline, it is more likely to cause problems in Dubai than in a cooler, more humid climate.

Senior nutrition in cats is the area most commonly misunderstood, and where well-intentioned advice sometimes causes harm.

The protein myth is the most important to address. For many years, senior cat food meant lower protein — the assumption being that kidneys would be spared by processing less of it. We now know this is wrong. Older cats actually need more protein than younger adults, because their ability to utilise dietary protein decreases with age. A senior cat on a low-protein food will lose muscle mass and body condition. The thin, bony elderly cat that many owners assume is 'just old' is often a cat that has been protein-deficient for years.

The exception is confirmed chronic kidney disease (CKD). Cats with CKD do benefit from reduced protein and, more importantly, reduced phosphorus — but this should be prescribed after bloodwork confirms the diagnosis, not assumed because the cat is 11. Putting a healthy senior cat on a kidney diet is unnecessary and potentially counterproductive.

Weight loss in a senior cat is a clinical sign, not an ageing inevitability. Hyperthyroidism is the most common cause — it produces weight loss despite a normal or increased appetite, and responds well to treatment. Diabetes, dental pain, gastrointestinal disease, and cancer are also on the list. If your cat over 10 is losing weight, book a vet appointment rather than switching foods and hoping for the best.

Raw feeding: the biological rationale is sound — cats evolved eating whole prey — but the practical execution is where problems arise. Raw meat in a domestic setting can carry Salmonella, Campylobacter, Listeria, and Toxoplasma gondii. Cats can shed these in their faeces, creating transmission risks for people in the household. Nutritionally balanced home-prepared raw diets are genuinely difficult to formulate — errors in supplementation cause problems that take months to become visible.

Commercially prepared raw diets that carry a complete and balanced claim are a different proposition: they have been formulated to avoid nutritional imbalances, and many are high-pressure pasteurised to reduce pathogen load. If you want to feed raw, this is the route worth considering — and discuss hygiene protocols with your vet.

Grain-free for cats: less of a concern than for dogs (the cardiac link identified in dogs has not been replicated in cats, who have very different carbohydrate metabolism). But grain-free is not inherently better either. Most carbohydrates in cat food serve as binders for the kibble. Whether those carbohydrates come from grains or legumes makes very little nutritional difference for a healthy cat.

Novel protein diets — duck, kangaroo, venison — have genuine utility for cats with confirmed food allergies or intolerances. They are also heavily marketed to cats without any food sensitivity, which inflates cost without providing benefit. If your vet has not identified a food allergy, there is no nutritional reason to pay a premium for exotic proteins.

Wet food is generally better for adult cats than dry food, primarily for hydration reasons. It also tends to be higher in protein and lower in carbohydrates, which aligns better with feline metabolism. If you can feed wet food for at least one meal a day, that is a meaningful improvement over dry-only, even if it is not a full switch.

Transitioning a dry-food cat to wet food requires patience. Start by placing a small amount of wet food alongside their usual dry rather than removing the dry abruptly. Some cats take weeks to accept wet food, and forcing the transition too quickly can cause food aversion — where the cat associates the new food with stress and refuses it long-term. If your cat has been on dry food for years and is healthy, don't force the change. A water fountain alongside their dry food is a lower-stress way to improve hydration.

The cats that benefit most from switching to wet food are those showing early signs of kidney issues on bloodwork, cats with recurrent urinary tract problems, and overweight cats — since wet food tends to be more satiating per calorie than dry.