Hannah Zulueta The Powerhouse and the Filter
Mitochondria, the Warburg effect, and why the bowl decides the fuel
Dogs have under a million nephrons in each kidney, and every stage of kidney disease means fewer of them still working. What keeps the survivors alive is energy, made by mitochondria, and what feeds the mitochondria is the bowl. This is the page where your dog’s kidneys and your dog’s food turn out to be the same subject.
The kidney is the second hungriest organ in the body
After the heart, the kidney has the highest mitochondrial content and oxygen consumption of any organ. Its proximal tubular cells burn enormous energy pulling nutrients back and pushing wastes out against chemical gradients, all day, every day. So when we talk about protecting a kidney dog, we are really talking about keeping mitochondria healthy, and mitochondria run on what you feed them.
What a nephron is, and why it needs so much power
A nephron is the kidney’s functional unit, built from many cell types, including epithelial cells, podocytes, and endothelial cells. Those cells are packed with mitochondria, the organelles that digest nutrients and create energy for the cell through cellular respiration. The kidney needs that army of mitochondria to remove wastes from the blood and regulate fluid and electrolyte balance, hour after hour, without a break.
The Warburg effect, in a kidney instead of a tumor
The Warburg effect is most famous from cancer biology: cancer cells, somewhat counterintuitively, prefer fermentation as their energy source instead of the far more efficient mitochondrial pathway, oxidative phosphorylation. The same shift has been observed in kidney disease, and in a kidney it plays out like this:
Three things push a diseased kidney toward this shift: the loss of function itself, which lets urea accumulate; chronic inflammation, which damages cells and tissues; and the metabolic reprogramming of the kidney cells described above. The Warburg effect is complex and not fully understood, and if you want the concept walked through visually, this human-medicine explainer demonstrates it well.
The mistake that moves the disease along
One of the biggest problems I see with dogs diagnosed with kidney disease: well-meaning pet parents move the dog to a low-protein diet and then feed less than the dog needs to live. The dog loses weight, the energy dims, and the malnutrition moves the kidney disease along. Stack a prescription diet on top, one built on refined carbohydrates and easy glucose, and you have fast fuel for the Warburg shift compounded by a dog who is not getting enough of the right nutrients, which means greater oxidative damage landing on the kidneys.
If the low-protein reflex sounds familiar, the research behind it is worth reading in full: the very first kidney studies removed 75 percent of the rats’ kidneys, and while the low-protein diet produced better lab results, the rats were so weak they could not feed themselves and had to be kept alive on dextrose. That detail is left out of the abstracts, but it is in Addis’s own book, and the whole story lives in Protein Malnutrition in CKD Dogs.
The mitochondrial diet, and how I actually apply it
This approach to feeding intends to improve mitochondrial health, and it is, essentially, a species-appropriate diet. It is composed of:
- Animal protein
- Healthy fats: fish, coconut oil, avocado
- Leafy greens, chosen against the greens chart for a kidney dog
- Antioxidant-rich foods
- Whole, intact, low-phosphorus starches in measured amounts: sweet potato, pearl barley, black rice
- Refined starches and easy glucose
- Flour-based and processed foods
- Sugars, and that includes fruit and honey
You may have noticed that starches made the bowl, because in my CKD recipes they do: I use sweet potato with pearl barley or black rice, and they earn their place three ways. They carry calories, so protein is spared for tissue repair instead of being burned as fuel. They dilute the phosphorus load, which is why the low-phosphorus carbohydrate list exists at all. And they are whole and intact, digesting slowly, nothing like the refined flours and easy glucose the Warburg research warns about. The line I hold is refined versus whole, not carbohydrate versus none.
Your vet will often instruct you to feed less protein, and I can formulate a diet many different ways. But if it were my own dog with kidney disease, I would feed a diet structured the way I have described above.
Mitochondria questions, answered plainly
What does the Warburg effect have to do with kidney disease?
The Warburg effect is a shift from efficient mitochondrial energy production to fast, wasteful fermentation. Observed in kidney disease as well as cancer, it raises lactate and contributes to urea buildup, handing a failing filter more waste exactly when it can least manage it.
Loss of function, chronic inflammation, and the metabolic reprogramming of kidney cells all push toward the shift, which is why the fuel entering the body is worth choosing deliberately.
What is a mitochondrial diet for dogs?
A diet built to support cellular energy production: animal protein, healthy fats like fish, coconut oil, and avocado, leafy greens, antioxidant-rich foods, and whole low-phosphorus starches in measured amounts, with refined starches, processed foods, and sugars off the menu, plus daily walks and one fasted meal a week with water.
For a kidney dog, this direction still gets shaped around the phosphorus budget and the stage; the framework sets the compass, the labs set the boundaries.
Are carbohydrates bad for dogs with kidney disease?
The concern is refined starches, easy glucose, and sugars, which are fast fuel for the Warburg shift and are common in prescription kibbles. That is a different claim than declaring all carbohydrates the villain; your dog’s bloodwork, weight, and energy tell you how your dog is actually handling the bowl.
The research signal points at reducing carbohydrates, especially fructose, while the dog in front of you decides the degree. In my own CKD recipes, whole intact starches like sweet potato, pearl barley, and black rice stay in the bowl for their calories and phosphorus dilution.
Not just years to the life, but life to the years
Dogs need protein from animals, and the deciding question for the bowl is what keeps the mitochondria healthy. Easy glucose feeds the Warburg shift, which raises the lactate and urea we are trying to avoid. As dog parents we are always trying to add years to our dog’s life, but perhaps the better question is how we add a better quality of life to those years. A fresh food diet leads to better mitochondrial health, and with it, more life in the years your dog has with you. If you want that bowl built for your dog’s actual stage and labs, bring the bloodwork and we will build it together.
References
Bhargava, P., & Schnellmann, R. G. (2017). Mitochondrial energetics in the kidney. Nature Reviews Nephrology, 13(10), 629-646. https://doi.org/10.1038/nrneph.2017.107
Charlot, A., Conrad, O., & Zoll, J. (2020). Ketogenic diet: A new nutritional strategy for cancer therapy? Biologie Aujourd’hui, 214(3-4), 115-123. https://doi.org/10.1051/jbio/2020014
Mafra, D., Gidlund, E. K., Borges, N. A., Magliano, D. C., Lindholm, B., Stenvinkel, P., & von Walden, F. (2018). Bioactive food and exercise in chronic kidney disease: Targeting the mitochondria. European Journal of Clinical Investigation, 48(11), Article e13020. https://doi.org/10.1111/eci.13020
Nakagawa, T., Sanchez-Lozada, L. G., Andres-Hernando, A., Kojima, H., Kasahara, M., Rodriguez-Iturbe, B., Bjornstad, P., Lanaspa, M. A., & Johnson, R. J. (2021). Endogenous fructose metabolism could explain the Warburg effect and the protection of SGLT2 inhibitors in chronic kidney disease. Frontiers in Immunology, 12, Article 694457. https://doi.org/10.3389/fimmu.2021.694457
Podrini, C., Cassina, L., & Boletta, A. (2020). Metabolic reprogramming and the role of mitochondria in polycystic kidney disease. Cellular Signalling, 67, Article 109495. https://doi.org/10.1016/j.cellsig.2019.109495
Poplawski, M. M., Mastaitis, J. W., Isoda, F., Grosjean, F., Zheng, F., & Mobbs, C. V. (2011). Reversal of diabetic nephropathy by a ketogenic diet. PLOS ONE, 6(4), Article e18604. https://doi.org/10.1371/journal.pone.0018604
Thome, T., Kumar, R. A., Burke, S. K., Khattri, R. B., Salyers, Z. R., Kelley, R. C., Coleman, M. D., Christou, D. D., Hepple, R. T., Scali, S. T., Ferreira, L. F., & Ryan, T. E. (2020). Impaired muscle mitochondrial energetics is associated with uremic metabolite accumulation in chronic kidney disease. JCI Insight, 6(1), Article e139826. https://doi.org/10.1172/jci.insight.139826
Wong, K. K. L., & Verheyen, E. M. (2021). Metabolic reprogramming in cancer: Mechanistic insights from Drosophila. Disease Models & Mechanisms, 14(7), 1-17. https://doi.org/10.1242/dmm.048934
Zhang, G., Darshi, M., & Sharma, K. (2018). The Warburg effect in diabetic kidney disease. Seminars in Nephrology, 38(2), 111-120. https://doi.org/10.1016/j.semnephrol.2018.01.002
This page is education, not diagnosis. The rodent findings cited here inform feeding direction; your dog’s plan is set with your veterinarian against stage and bloodwork. This page is part of the kidney disease guide, and the full library of kidney articles lives here.
Hannah Zulueta obtained her Certificate in Canine Nutrition from CASI Institute. She is also studying for her Doctorate in Acupuncture, Traditional Chinese Medicine, and Herbalism from the esteemed Pacific College of Health and Medicine. If you’re as keenly interested in health for yourself, visit her website for human health: Satori Acupuncture and Herbs.
She resides in San Diego with her three dogs, Maggie, Orbit, and Mr. Higgins.
She is available for one on one consultations. She develops evidence-based recipes that meet both NRC and AAFCO nutritional standards while integrating the therapeutic food principles of Traditional Chinese Veterinary Medicine into her formulations.
Additionally, you can find her sharing free content on Instagram.
