Cats are creatures of olfactory habit. They learn the smell of one food in kittenhood and develop quietly opinionated views about anything that smells different. This is why a sudden food swap so often ends with a half-eaten bowl, a soft stool, and a cat staring at you with disgust.
A slow swap fixes most of that. Here is the plan we send every new customer.
The seven-day plan
Mix the new food into the old food, increasing the ratio over the week. Same bowl, same spot, same time of day as before. Consistency in everything except the contents.
| Days | Old food | New food |
|---|---|---|
| 1–2 | 75% | 25% |
| 3–4 | 50% | 50% |
| 5–6 | 25% | 75% |
| 7+ | 0% | 100% |
For most cats, this is enough. Stools may soften slightly on day 3 or 4 and settle by day 6. Appetite usually picks up around the halfway point, when the new food’s smell starts to feel familiar.
If your cat is older, has GI sensitivities, or has been on one specific food for years, slow it down. Spread each phase to three or four days instead of two. Cats have been known to need a full month for a clean transition. That’s fine.
Five things that help a fussy eater
Picky cats need a little stage management. None of this is fancy:
- Warm the food to roughly body temperature. A sealed pouch in lukewarm water for two minutes works. Warmth releases the volatile compounds that make food smell interesting to a cat. Cold food, fresh from the fridge, smells like nothing.
- Same bowl, same spot, same time. Don’t introduce a new dish on the same day as new food. Don’t move the feeding station. Reduce variables.
- A pinch of freeze-dried liver as a topper. Just for the first week. Cats trust food that smells like food they know is meat.
- Smaller, more frequent meals. Three or four small portions a day during transition, instead of two larger ones. It looks fresh every time you put it down.
- Twenty-minute window. Put it down, leave the room, come back in twenty minutes. Whatever isn’t eaten gets picked up. No grazing buffet. Hunger is the most reliable seasoning we have.
What does not help: hovering, talking to the cat about the food, offering several options on a tasting board, or topping with something so good (tuna juice, cooked prawns) that the cat learns to hold out for it. Patience and consistency win this fight.
When to slow down
Some cats need extra time. Slow each phase by two extra days if you see any of these:
- Soft or loose stools that don’t clear within 24 hours.
- Vomiting more than once.
- Eating less than half the daily ration two days in a row.
- Hiding more than usual, or sleeping in unfamiliar spots.
Loose stools alone are usually just the microbiome rebalancing. A 50/50 phase that lasts five days instead of two is fine.
When to call a vet
Cats don’t have the metabolic flexibility to skip meals. If your cat refuses to eat for more than 24 hours, that’s a vet call.
The reason matters. Overweight cats who stop eating can develop hepatic lipidosis, a fast-moving liver condition in which the body mobilises fat faster than the liver can process it. Untreated, it can be fatal within a week. It is the single most important reason to keep an eye on intake during a food switch.
Signs to watch for, alongside not eating:
- Yellowing of the gums or the whites of the eyes.
- Drooling.
- Lethargy beyond the usual “I’m offended” sulk.
- Sudden weight loss.
If any of these show up, stop the transition, go back to the old food, and book a vet appointment the same day. The transition can wait. The liver can’t.
What you’ll notice by week three
For cats who land cleanly on the new food, here’s the rough timeline of visible change:
- Week 1: stools change. Smaller, firmer, less smelly.
- Week 2: water bowl gets visited less often. Cats getting moisture from food drink less.
- Week 3 to 4: coat looks different. Smoother, slightly glossier. Less dandruff at the base of the tail.
- Week 6 to 8: weight settles. Overweight cats trend down. Underweight cats trend up. Both at roughly 1 to 2% of body weight per week, which is the safe rate.
These are the markers we ask new customers to track. They’re also a useful baseline for spotting illness later. If you know what your cat looks like when they’re thriving, you’ll notice when they’re not. We wrote up the signs to watch for for that exact reason.
A note on portion size
Fresh food is more nutrient-dense per gram than kibble. Most cats need 30 to 40% less by weight when they switch from a kibble diet to a fresh diet of comparable caloric density. Our portion calculator handles this automatically, but if you’re feeding any fresh food unportioned, weigh the bowl and look up daily calorie needs for your cat’s weight. The most common transition mistake is overfeeding by volume because the new food looks “less” than the old food did.
If you’re a few days in and something isn’t going to plan, message us. We’ve watched a few thousand transitions by now and most of them have a fix.
