AGEs in Dog Food: The Hidden Ageing Factor in Your Dog's Bowl
We all want the same thing for our dogs: a long, happy, healthy life. Not just more years, but good years. Years where they're still running along the beach, playing tug-of-war and greeting us at the door like we've been gone a month.
There's a hidden ageing factor sitting in a lot of dogs' bowls, and hardly anyone talks about it. It's called AGEs, and it matters a lot for long-term health and longevity, for us and for our dogs.
The good news? Prevention is the key, and it starts with small changes you can make today.
What are AGEs in dog food?
AGEs stands for advanced glycation end products. It's a mouthful, so think of it this way:
When sugars bump into proteins or fats, they can stick together and form AGEs.
It's the same browning reaction that turns bread into toast or gives a steak its crust. Delicious for us, less great for the body.
Dogs get AGEs from two places:
Their food: the higher the heat and the more processed the food, the more AGEs it contains.
Their own body: AGEs form naturally as part of metabolism, and more so when blood sugar runs high or the body is under a lot of oxidative stress.
The simplest way to picture AGEs is rust. A little is normal. Too much, built up over years, starts to stiffen and wear things out.
How do AGEs affect dogs?
Once AGEs build up in the body, they can:
Stick to long-lasting tissues like collagen, cartilage, blood vessels and the lens of the eye, making them stiffer and less flexible.
Switch on inflammation by binding to a receptor called RAGE. That sets off a chain reaction of free radicals and inflammation, which then creates even more AGEs. It's a vicious cycle.
What does the research say about AGEs and dogs?
Studies in dogs
Dogs on commercial diets are estimated to eat about 122 times more AGEs than humans per kg of body weight.
Dogs fed dry food excrete 2 to 3 times more AGEs in their urine than raw-fed dogs, which shows those AGEs are being absorbed.
A 2024 University of Georgia study found that high-heat diets (kibble and canned) raised AGE levels in dogs' blood, and kibble reduced the diversity of their gut bacteria.
AGEs have been found in the tissues of dogs with cataracts, arthritis, vascular disease and age-related cognitive decline.
No one has yet put the time, money and years into long-term studies proving that AGEs cause specific diseases in dogs. Studies like that are slow and expensive, and the pet food industry isn't rushing to fund them.
What human studies show
Diets high in AGEs raise inflammation markers and oxidative stress in people.
In people with type 2 diabetes, cutting dietary AGEs improved insulin resistance. Overweight women saw similar improvements in just 4 weeks on a low-AGE diet.
A large Dutch study of over 70,000 people found that higher AGE build-up in the skin predicted type 2 diabetes, heart disease and death.
The human trials are mostly small and short, so researchers are still cautious. But the direction is consistent. AGEs act the same way in a dog's body as in ours, so I'd much rather be proactive than wait another 20 years for the dog studies to catch up.
Raw vs kibble: which dog foods are highest in AGEs?
Processing is the biggest factor. A 2026 UK study of 41 dog foods found cooking temperature mattered most, not price or brand. Premium and prescription diets were no better than budget ones.
From lowest to highest AGEs:
Raw: no heat, so the lowest AGE potential.
Freeze-dried: water is removed without cooking. It hasn't been properly measured yet, but it's likely one of the lowest AGE options and a great choice for convenience.
Lightly cooked homemade: gentle, wet cooking like poaching, steaming or slow cooking keeps AGEs low. Skip roasting, grilling and frying.
Air-dried: in the low-heat group in research, and much better than baked treats. Quality varies between brands, though.
Kibble: cooked at 120 to 200°C, with more protein damage.
Canned/wet: the highest AGE levels of all, because the cans are sterilised under heat and pressure.
Don't forget the treats
Treats count too. Swapping baked biscuits for freeze-dried or air-dried treats is one of the easiest wins.
How does your dog's body clear AGEs?
Your dog's body has its own clean-up crew:
The glyoxalase system neutralises the reactive sugar by-products before they turn into AGEs. It relies on glutathione, the body's own master antioxidant.
The kidneys filter free AGEs out in the urine.
The liver and immune cells break down some AGEs and clear them away.
The catch: AGEs that have already bonded to long-lived tissues like cartilage and eye lenses are very hard to remove. That's why prevention matters so much more than cure.
Free radicals and antioxidants: breaking the cycle
Free radicals are unstable molecules that damage cells. AGEs make more of them, and free radicals help make more AGEs.
Antioxidants are the peacekeepers. They neutralise free radicals before they cause damage, and they support the body's own defences like glutathione.
So the plan is simple:
Reduce what goes in by feeding lower-heat food.
Strengthen the defences with antioxidant-rich whole foods.
The best antioxidant foods for dogs
Start small and build up slowly, especially with veggies.
Blueberries, blackberries and raspberries: packed with polyphenols.
Broccoli and broccoli sprouts: contain sulforaphane, which helps switch on the body's own antioxidant systems. Lightly steam the broccoli.
Kale and silverbeet: lightly steam or blend for easier digestion.
Kiwifruit: a Kiwi classic, high in vitamin C. Peel it and offer a small amount.
Pumpkin, carrot and kumara: colourful antioxidants plus gut-friendly fibre.
Sardines: omega-3s to help calm inflammation.
Eggs and organ meats: provide the building blocks the body uses to make glutathione.
Tip: blend or lightly cook the veggies. Dogs can't break down plant cell walls well, so pulping them helps release the good stuff.
Supplements that can support your dog
Food comes first, always. If you'd like extra support, these are my top picks for a prevention-first approach:
An all-in-one daily blend with vitamin E, vitamin C, blueberries and broccoli sprout for antioxidant support.
Also contains green-lipped mussel, turmeric with black pepper, and probiotics.
Omega-3s can help calm the inflammation side of the AGE cycle.
Especially useful for older dogs and for joints.
Highly processed diets can reduce gut bacteria diversity. This combo supports a healthy gut lining and microbiome.
My go-to annual gut reset.
If your dog is on medication or has a diagnosed condition, please check with your vet before adding supplements.
Your AGE prevention checklist
Move towards raw, freeze-dried or lightly cooked food where you can
If kibble is staying, mix in fresh food to dilute it
Swap baked treats for freeze-dried or air-dried ones
Add a few antioxidant-rich foods to the bowl
Keep your dog lean and active
Support the gut and liver, the body's built-in clean-up crew
Frequently asked questions about AGEs in dog food
Is kibble bad for dogs because of AGEs? Kibble is cooked at high temperatures, so it contains more AGEs than raw or lightly cooked food. If kibble works for your family, mixing in fresh food and antioxidant-rich toppers is a great place to start.
Is freeze-dried dog food low in AGEs? Freeze-drying removes water without cooking, so it's likely one of the lowest AGE options. It hasn't been directly measured in studies yet.
Can supplements remove AGEs from my dog's body? No supplement can remove AGEs that have already built up in tissues. Antioxidants and good nutrition support the body's natural defences, which is why prevention matters most.
Are expensive dog foods lower in AGEs? Not necessarily. A 2026 study found price made no difference. Cooking temperature was the biggest factor.
Want a personalised plan for your dog?
If you'd like help working out the best low-AGE, gut-first diet for your dog, I'd love to help.
Book at www.thehealthyhound.nz/consultations. The initial consultation is $150.
Fill in the dietary history form I'll send you, covering diet, health history, lifestyle and concerns. If your dog has a diagnosed condition, I'll ask for vet records too.
I build a personalised written plan covering nutrition, gut healing, supplements and lifestyle. It usually takes 2 to 3 days, and you'll get it before we meet.
We go through it together, with a home visit if you're local, or by phone or video anywhere in NZ.
3 months of email support for questions and check-ins.
Here's to long, happy, healthy lives for our dogs.
Kat
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