High-Starch or High-Fat Diet: Which Is Better for Dogs’ Metabolism?

· by Glendon Lloyd Dip.Canine.Nutrition Dip.Dog.Nutrigenomics

High-Starch or High-Fat Diet Which Is Better for Dogs’ Metabolism?

Carbohydrates vs Fats – Guide to Risks and Benefits for Dogs

Summary

The choice between high-starch and high-fat diets for dogs is crucial, impacting their metabolism, energy levels, and long-term health. Recent research has highlighted the effects of these diets, but understanding what constitutes a high-fat or high-starch diet is essential for making informed decisions about commercial dog foods. This article synthesises findings from multiple studies to explore the metabolic implications of these diets and provides practical guidance for selecting the best diet based on a dog’s specific needs.

Table of Contents

Introduction

Diet is a key factor in canine health, influencing not only physical condition but also metabolic function and disease risk. The debate over whether a high-fat or high-starch diet is more beneficial for dogs has driven significant research. To make informed choices, it’s crucial to understand what constitutes high-fat and high-starch diets in the context of commercial dog foods. This article aims to integrate findings from key studies to offer a comprehensive analysis, helping determine which diet may be more advantageous for long-term canine health.

Defining High-Fat and High-Starch Diets

What Constitutes a High-Fat Diet?

In the context of the research studies provided, a high-fat diet (HFD) is typically characterised by a macronutrient composition where fats constitute a significant proportion of the diet’s caloric intake—generally ranging from 40% to 60% of total energy. For example, the study by Brennen McKenzie et al. (2024) define HFDs with fat content at the upper end of this spectrum, often designed to simulate the effects of high-fat commercial diets used in performance or working dogs. These diets might include high levels of animal fats, fish oils, and other lipid-rich ingredients, often with reduced carbohydrate content to compensate for the increased fat intake.

What Defines a High-Starch Diet?

High-starch diets (HSDs), on the other hand, are characterised by a higher carbohydrate content, often making up 40% to 60% of the total energy intake, with fats constituting a lower percentage, typically around 10% to 20%. Research delineates HSDs as diets rich in starchy foods such as rice, potatoes, and other grains, providing a steady source of glucose and reducing reliance on fat for energy. These diets are more akin to those used in commercial dog foods designed for less active pets or those with specific health concerns, such as obesity or diabetes.

Understanding these definitions is essential for interpreting the results of the studies and applying them to the choice of commercial dog foods. High-fat commercial diets often target performance dogs with high energy needs, while high-starch diets are generally more suitable for the average family dog, particularly those with a lower activity level or specific metabolic needs.

High-Fat Diet and Canine Metabolism

Metabolic Changes Induced by High-Fat Diets

High-fat diets significantly impact dogs’ metabolic processes. As documented in the research studies referenced, such diets lead to increased lipid metabolism, evidenced by elevated levels of circulating lipids and ketone bodies. While these adaptations can benefit highly active dogs, they may also contribute to metabolic derangements, such as insulin resistance and dyslipidaemia, especially in less active or older dogs.

Digestibility and Energy Utilisation

The digestibility of high-fat diets is another critical factor. Research highlights that while these diets are energy-dense, their heavy fat content may impair the digestibility of other nutrients over time, placing additional stress on the pancreas and liver.

Long-Term Health Implications

Long-term adherence to a high-fat diet can increase the risk of chronic conditions like obesity, cardiovascular disease, and diabetes. The accumulation of visceral fat, as noted in studies from PH Marchi et al· 2022 and THA Vendramini et al · 2020, is a significant risk factor for metabolic syndrome, which can severely impact a dog’s health and longevity.

High-Starch Diet and Canine Metabolism

Benefits of High-Starch Diets

High-starch diets, with their emphasis on carbohydrates, tend to promote more stable glucose levels and enhanced insulin sensitivity. Research study in 2022 by Y Lu et al demonstrates that dogs on HSDs have lower circulating lipid levels and a more balanced lipid profile, reducing the risk of metabolic disorders.

Effects on Gut Health and Digestibility

High-starch diets are generally more digestible, especially when supplemented with dietary fibres like cellulose. The study by  IC Alvarenga et al · 2021 shows that fibre can improve the digestibility of starches and mitigate gastrointestinal issues, making these diets more suitable for dogs with sensitive stomachs.

Comparative Analysis with High-Fat Diets

HSDs generally support better long-term metabolic health than HFDs, particularly in dogs prone to obesity or with lower activity levels. The lower inflammation and oxidative stress levels associated with HSDs offer significant health benefits compared to the potential drawbacks of HFDs.

Inflammation and Oxidative Stress

Impact of Diet on Inflammatory Markers

Diet-induced inflammation is a key concern with high-fat diets, as noted by Y Lu et al. (2022) and A Moinard · 2020. In contrast, high-starch diets have been shown to reduce inflammatory markers, offering a protective effect against chronic inflammation and related diseases.

Oxidative Stress and Long-Term Effects

High-fat diets are also linked to increased oxidative stress, which can accelerate aging and increase disease risk. According to Y Lu et al. (2022), the antioxidant properties of high-starch diets, especially when combined with fruits and vegetables, can help mitigate these effects, promoting healthier aging.

Dietary Fibre and Its Role

Impact of Fibre on High-Starch and High-Fat Diets

Fibre plays a crucial role in the digestibility and metabolic effects of both high-starch and high-fat diets. IC Alvarenga et al · 2021 highlight that fibre can enhance the digestibility of starches and manage fat metabolism, supporting gut health and reducing the risk of gastrointestinal disturbances.

Health Implications of Fibre Supplementation

Fibre supplementation in both diet types improves nutrient absorption and aids in weight management. Fibre is particularly beneficial in high-starch diets, improving metabolic health and reducing obesity risks.

Practical Considerations for Pet Owners

Choosing the Right Diet for Your Dog

Choosing the right diet depends on your dog’s specific needs, including age, activity level, and health status. High-fat diets may be appropriate for highly active dogs, while high-starch diets are generally better for maintaining metabolic health in the broader canine population, particularly in dogs prone to obesity or with existing metabolic conditions.

Implications for Specific Canine Health Conditions

Dogs with conditions such as pancreatitis, gastrointestinal disorders, or metabolic syndrome may benefit more from high-starch, fibre-rich diets. High-fat diets should be used cautiously and tailored to the dog’s specific metabolic capacity and health status.

Conclusion

This comprehensive review suggests that while high-fat diets may serve specific purposes, particularly for energy-demanding dogs, high-starch diets generally offer more significant benefits for maintaining metabolic health. These include improved insulin sensitivity, reduced inflammation, and lower oxidative stress. Diet choices should be tailored to individual dogs’ health needs, considering factors such as age, activity level, and predisposition to metabolic disorders.

References

Lyu Y, Liu D, Nguyen P, Peters I, Heilmann RM, Fievez V, Hemeryck LY, Hesta M. Differences in Metabolic Profiles of Healthy Dogs Fed a High-Fat vs. a High-Starch Diet. Front Vet Sci. 2022 Feb 17;9:801863. doi: 10.3389/fvets.2022.801863. PMID: 35252418; PMCID: PMC8891928.

Isabella Corsato Alvarenga, Charles Gregory Aldrich, Yong-Cheng Shi,
Factors affecting digestibility of starches and their implications on adult dog health,
Animal Feed Science and Technology, Volume 282, 2021, 115134, ISSN 0377-8401,
https://doi.org/10.1016/j.anifeedsci.2021.115134.

McKenzie, B., Peloquin, M., Tovar, A., Graves, J. L., Ratcliff, E., Tucker, K., Vo, K., Greenwood, K., Halioua-Haubold, C., & Juarez-Salinas, D. (2024). Feeding dogs a high-fat diet induces metabolic changes similar to natural aging, including dyslipidemia, hyperinsulinemia, and peripheral insulin resistance. American Journal of Veterinary Research, 85(6), ajvr.23.11.0253. Retrieved Aug 25, 2024, from https://doi.org/10.2460/ajvr.23.11.0253

Kienzle, Ellen & Dobenecker, Britta & Eber, S. (2001). Effect of cellulose on the digestibility of high starch versus high fat diets in dogs. Journal of animal physiology and animal nutrition. 85. 174-85. 10.1046/j.1439-0396.2001.00315.x.

Dale R. Romsos, Panfilo S. Belo, Maurice R. Bennink, Werner G. Bergen, Gilbert A. Leveille,
Effects of Dietary Carbohydrate, Fat and Protein on Growth, Body Composition and Blood Metabolite Levels in the Dog, The Journal of Nutrition, Volume 106, Issue 10, 1976, Pages 1452-1464, ISSN 0022-3166, https://doi.org/10.1093/jn/106.10.1452.

Alex Moinard, Cyrielle Payen Khadija Ouguerram, Agnès André, Juan Hernandez, Amandine Drut, Vincent C. Biourge, Jan S. Suchodolski, John Flanagan, Patrick Nguyen, Véronique Leray Effects of High-Fat Diet at Two Energetic Levels on Fecal Microbiota, Colonic Barrier, and Metabolic Parameters in Dogs Front. Vet. Sci., 25 September 2020 Sec. Animal Nutrition and Metabolism Volume 7 – 2020 | https://doi.org/10.3389/fvets.2020.566282

About Glendon Lloyd Dip.Canine.Nutrition Dip.Dog.Nutrigenomics

I have had dogs from the day I was born. Much to my Mum's amusement, my Dad bought home Zetta, a beautiful corgi puppy , as his contribution to our new family!

Fast forward to 2018 and Catherine, my wife, and one of our dogs Poppy, were both diagnosed and treated for cancer within months of each other

Diet and its impact on health, cancer particularly, led me down a rabbit hole of discovery.

I consumed information voraciously - on our diets, our dogs' diets and the impact these have not just on health but also the health of our increasingly fragile planet.

I was humbled by the time and expertise given so freely by doctors and vets, canine nutritionists and scientists, academics and agronomists. The more I learned the more I understood there had to be a better way to improve not just our health but also our dogs and the planet's.

The result of my trip down that rabbit hole is Bonza, a plant-based dog food (and now supplements) that elevate our dogs' diet beyond simple nutrition to a diet that inspires a healthier everyday life for our dogs and the planet.

I am continually researching the nutritional impact our dogs' diets have on their health and wellbeing and the ingredients and nutrients we should include in, and exclude from, their food to deliver longer, healthier lives.

I am delighted that my trip down the rabbit hole has led to me completing a Diploma in Canine Nutrigenomics and a Diploma in Canine Nutrition being awarded a Distinction for both my coursework and theses!

ADD LIFE TO YOUR DOG'S YEARS

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