The short answer
Switch your cat's food gradually over at least 14 days, mixing in a little more of the new food and a little less of the old food every few days. Naturo recommends this longer, unhurried timeline because it gives a cat's digestive system proper time to adjust and lowers the chance of an upset stomach. Some cats need even longer, so go at their pace rather than the calendar's.
Key takeaways
- A sudden switch is the most common reason a food change goes wrong, not the new food itself.
- Naturo recommends transitioning cats over a minimum of 14 days, longer than some quicker switch guides you'll see elsewhere.
- Mixing old and new food gradually, in small steady increases, is gentler on a cat's digestion than a fast switch.
- Watch stool quality, appetite and energy during the switch, not just whether your cat "likes" the new food.
- Some cats, especially older or more sensitive ones, need even longer than 14 days -that's normal, not a sign something's wrong.
- Speak to your vet before changing your cat's diet if they have an existing health condition.
Why do I need to transition my cat's food gradually?
A cat's digestive system needs time to adjust to a new recipe, and switching abruptly can lead to loose stools, vomiting or a cat simply refusing to eat. UK Pet Food advises that anyone considering a change in diet for their cat has a range of reliable sources of guidance available, from their vet to pet food manufacturers and nutritionists, precisely because getting the transition right matters. That's why Naturo recommends owners take their time over the switch rather than rushing it.
Cats can also be creatures of habit in a way other pets aren't. A new smell, texture or shape of kibble can be enough to put a fussier cat off entirely if it's introduced all at once. Blending it in gradually gives your cat's gut bacteria time to adapt and gives your cat itself time to get used to the new food alongside something familiar.
How long does it take to transition a cat to new food?
Naturo recommends a minimum of 14 days to transition a cat onto a new food, longer than the 7 to 10 days you'll see quoted for some other diet switches. This slower pace reflects how sensitive a cat's gut can be to change, and it's the approach we'd suggest whenever you're moving a cat onto any new Naturo recipe.
Every cat is different, though. A kitten or a cat who's changed diets before may settle in comfortably within the 14-day window. An older cat, a naturally cautious eater, or a cat who's been on the same food for years may need three weeks or longer. There's no harm in slowing down further if your cat needs it -the goal is a smooth switch, not a fast one.
What's Naturo's recommended day-by-day schedule for switching cat food?
Here's the gradual, 14-day-plus structure we recommend, which you can stretch out further if your cat needs more time:
- Day 1-4: Naturo 20% | Old Food 80%
- Day 5-7: Naturo 40% | Old Food 60%
- Day 8-10: Naturo 60% | Old Food 40%
- Day 11-13: Naturo 80% | Old Food 20%
- Day 14: Naturo 100%
- Measure by weight, not eyeball. Use the feeding guide on the new food's pack as your reference for the total daily amount, then split that total between old and new food according to the ratios above.
- Hold a stage for longer if needed. If your cat's stools loosen or they seem unsettled, stay at the current ratio for a few extra days before moving on, rather than pushing ahead on schedule.
- Restart at a lower ratio if things go backwards. If your cat develops noticeable digestive upset, drop back to the previous stage for several days before trying again.
- Give it the full 14 days, even if your cat seems fine early on. A cat happily eating a 50/50 mix by day 6 can still benefit from the slower final stages, since digestive adjustment can lag behind appetite.
What should I watch for while switching my cat's food?
- Keep an eye on stool quality, appetite and general energy throughout the transition, since these tell you far more than whether your cat seems enthusiastic at the bowl.
- Stool quality. Mild, brief softening in the first day or two isn't unusual. Ongoing diarrhoea, especially with several days of no improvement, is worth pausing the transition and speaking to your vet about.
- Appetite. Some cats are cautious around new food and eat a little less at first. A cat who stops eating altogether for more than 24 hours needs a vet check, regardless of what's caused it.
- Vomiting. The odd hairball-related sick is normal cat life. Repeated vomiting during a diet change is not, and warrants a call to your vet.
- Coat and energy. These change slowly, so don't expect visible differences within the transition week -they're more relevant if you're tracking how a cat settles into a new diet over the following month.
Why might I need to switch my cat's food in the first place?
Owners usually change their cat's food for one of a few reasons: a life stage change, a shift in lifestyle or activity, or simply moving to a different recipe or brand.
- Life stage. Moving from kitten to adult food, or adult to a senior recipe, as your cat's nutritional needs change with age.
- Lifestyle changes. For example, a cat becoming more or less active, or moving between an indoor and outdoor routine.
- Weight management. A vet-recommended change to help a cat reach or maintain a healthy weight.
- Preference or ingredient changes. Simply wanting to try a different recipe, protein, or a grain-free option such as those in Naturo's cat food range.
Whatever the reason, the same gradual approach applies. There's no need to rush a switch just because the reason behind it feels urgent -the transition itself should stay slow and steady regardless.
Do I need to speak to my vet before switching my cat's food?
For a healthy adult cat with no existing conditions, a routine food switch generally doesn't need vet sign-off, though it's always fine to ask if you're unsure. If your cat has a diagnosed health condition, is on a prescription or therapeutic diet, or has a history of food sensitivities, check with your vet before making any change. They can advise on timing and what to watch for specific to your cat's situation.
This article is for general information and doesn't replace advice from your vet, who can assess your individual cat's health and dietary needs.
