Diabetes, the New Epidemic

Diabetes is reaching epidemic numbers — in people and, increasingly, in our pets. Most pet diabetes looks like human Type 2: weight and diet are the big drivers, and the sugar-loaded, sugar-coated reality of McKibble and McCan sits right at the centre of it. The good news hidden inside that bad news? Diet is also the most powerful lever you have, and it’s one you control at every meal.

One thing first, because it’s the part that can save a life: if your pet is already on insulin, do not change their diet without your vet. A low-carb diet lowers insulin needs — sometimes dramatically — and a full insulin dose on a low-carb diet can cause life-threatening hypoglycaemia. The diet change below is powerful precisely because it’s powerful. Treat it that way.

The Basics: Glucose, Insulin and a Tired Pancreas

Diabetes is about how the body handles glucose — its main fuel. The pancreas makes insulin, the key that unlocks the body’s cells to let glucose in. When that system breaks down, glucose stays stuck in the bloodstream, the cells starve, and blood sugar climbs too high. There are two patterns:

• Type 1 — the pancreas can’t make enough insulin. Most diabetic dogs are Type 1 and need insulin.
• Type 2 — the more common form overall: the pancreas makes less insulin and the cells stop “listening” to it (insulin resistance). The pancreas pumps out more and more to compensate, until it wears out. Many diabetic cats are Type 2.

Left unchecked, chronically high blood sugar becomes glucose toxicity — it damages the very insulin-producing cells the body needs, so less insulin gets made, so blood sugar climbs further. It’s a downward spiral, which is exactly why the inputs you control matter so much.

Why Carbohydrates Are the Heart of the Problem

When a cat or dog eats a high-carb food like kibble, carbohydrate releases sugar into the blood far faster than protein or fat does — so blood sugar spikes. Add free-access grazing on a bowl of sugar-coated biscuits all day (instead of defined meals) and you’ve built a recipe for repeated spikes and a pancreas under constant stress. Cats are obligate carnivores; in nature they’d eat virtually no carbohydrate at all. There’s a strong argument that a true carnivore, eating as designed, would rarely meet diabetes in the first place.

It’s worth being fair to dogs here: unlike cats, dogs evolved alongside us and carry extra copies of the gene for amylase, the starch-digesting enzyme — so they handle some carbohydrate far better than an obligate-carnivore cat does. But “better than a cat” still isn’t “well,” and for a diabetic dog, less carbohydrate is still the goal.

A note on “good carbs vs bad carbs”: carbohydrates differ in Glycaemic Index and Glycaemic Load (how fast and how high they push blood sugar), and grain flours are worse than most. But for a carnivore the honest framing isn’t which carb — it’s how little. The goal is to keep carbohydrate near the level a cat or dog would encounter in nature, full stop.

The Obesity Link

Obesity is one of the biggest contributors to diabetes. Fat cells aren’t inert — they release hormones that make the body less responsive to insulin, and the more fat, the more of those hormones. The encouraging flip side: where weight is the driver, losing it can make a real difference, and some pets caught early can reduce or even come off insulin as the weight comes down — always under veterinary supervision, never as a DIY taper.

So What Do I Feed? Real Food, Low Carb, Defined Meals

For a diabetic carnivore the dietary direction is simple to say and powerful in practice: real, species-appropriate food with the carbohydrate stripped back to near-zero. Here’s how a raw, real-food diet pulls its weight:

• Minimal carbohydrate, minimal spikes. Raw meals carry little to no carbohydrate, so there’s far less of the rapid sugar surge that drives the whole problem.
• Defined meals, not all-day grazing. Real food fed at set mealtimes gives the body predictable, spaced inputs instead of a steady drip of sugar — easier on the pancreas and easier to match insulin to.
• Built-in moisture. Raw meat’s intracellular water keeps pets better hydrated than a water bowl alone — which matters, because diabetic pets are prone to urinary-tract and kidney trouble that dehydration worsens.
• Easier weight control. A naturally low-carb diet makes it simpler to shed and hold weight — directly attacking the obesity–insulin-resistance link.

One myth worth retiring: “prescription” diabetic diets are not automatically low-carb. Because kibble needs starch to hold its shape, even grain-free and prescription kibbles carry meaningful carbohydrate. Read past the label. And note that high-fibre diets — often pushed for diabetic cats — run counter to a cat’s natural diet, and the research doesn’t show cats benefiting from fibre the way diabetic dogs or humans might.

Switching a Diabetic Pet — Slowly and With Your Vet

This is where the safety note from the top becomes a procedure. The fasting “tough love” trick some people use to convert a stubborn kibble addict is not safe for a diabetic pet — and giving a full insulin dose to a pet that hasn’t eaten can trigger dangerous hypoglycaemia. So:

• Transition gradually, with patience, especially a dry-food-addicted cat.
• Test at home. If your pet is on insulin, blood-glucose monitoring at home is the safe way to manage a diet change.
• Expect the insulin dose to drop as carbs come out — and know that many vets under-estimate how much. Make sure yours is actively adjusting the dose downward as the food changes, so your pet isn’t over-dosed into hypoglycaemia.
• Never taper insulin yourself. Every dose change runs through your vet.

Symptoms — When to See Your Vet

Diabetes can creep up quietly. Book a vet visit (with a urine sample) if you notice:

• Increased thirst and urination — the classic early pair.
• Increased appetite with weight loss — eating more, yet losing condition, because the cells can’t use the fuel.
• Low energy / more sleep.
• Vision changes (diabetic cataracts, mainly in dogs).
• Hind-limb weakness in cats (the “plantigrade” stance — walking on the hocks); often improves once the diabetes is controlled.
• Recurrent urinary infections.

Key Takeaways

• Most pet diabetes is diet- and weight-driven — which means diet is your strongest lever.
• Carbohydrate is the core problem; carnivores do best near the carb level found in nature.
• Real food, low carb, defined meals — fewer spikes, better hydration, easier weight control.
• “Prescription” and grain-free kibble still carry carbs.
• Insulin + low-carb diet = hypoglycaemia risk. Change diet only with your vet, monitor at home, and let the vet lower the dose.
• Catch it early — thirst, urination, weight loss with a big appetite all warrant a vet visit.

Sources

• Zoran DL. The carnivore connection to nutrition in cats. Journal of the American Veterinary Medical Association. 2002;221(11):1559–1567. doi:10.2460/javma.2002.221.1559
• Axelsson E, Ratnakumar A, Arendt ML, et al. The genomic signature of dog domestication reveals adaptation to a starch-rich diet. Nature. 2013;495(7441):360–364. doi:10.1038/nature11837
• Algya KM, Cross TWL, Leuck KN, et al. Apparent total-tract macronutrient digestibility, serum chemistry, urinalysis, and fecal characteristics, metabolites and microbiota of adult dogs fed extruded, mildly cooked, and raw diets. Journal of Animal Science. 2018;96(9):3670–3683. doi:10.1093/jas/sky235
• National Research Council. Nutrient Requirements of Dogs and Cats. Washington, DC: National Academies Press; 2006. doi:10.17226/10668