A single amino acid can dramatically impact your cat's overall health and quality of life. Threonine, essential for various bodily functions, stands as an indispensable nutrient for your feline companion. But what exactly is threonine, and why is it so important? This blog post will guide you through everything you need to know about this unsung hero of feline health, from its benefits and dietary sources to deficiency risks and supplementation options.
Summary
What is threonine and why does your cat need it?
Threonine is an essential amino acid, meaning your cat cannot produce it independently . Therefore, it must be obtained through their diet. As a fundamental building block of protein, threonine is crucial for several key processes in your cat's body.
Protein Synthesis: threonine is vital for synthesizing proteins, which function as the workhorses of the body, participating in virtually all biological processes.
Muscle Developmen t: adequate threonine is necessary for maintaining and developing muscle mass, which is essential for your cat's strength and mobility.
Immune Function: this amino acid contributes to the production of antibodies and other immune components, helping to keep your cat healthy and protected from infections.
Gastrointestinal Health: threonine supports a healthy gut by serving as an energy source for gut microbes and maintaining the integrity of the intestinal lining.
Because your cat cannot produce threonine internally, it's critical to ensure they receive sufficient amounts through their diet to support these vital functions.
Health benefits of threonine for your cat
Threonine offers numerous health benefits for cats, supported by scientific research. Here are some key advantages of ensuring your cat receives enough of this essential amino acid.
Supporting muscle health and strength
Boosting immune function

Promoting digestive health
Enhancing overall well-being
How to provide adequate threonine in your cat's diet
Balanced diet is key
Emphasize the importance of a complete and balanced commercial diet .
When choosing commercial cat food, look for products that meet the Association of American Feed Control Officials (AAFCO) or Fédération Européenne de l'Industrie des Aliments Pour Animaux Familiers (FEDIAF) recommendations. These standards ensure that the food provides all the essential nutrients, including threonine, in appropriate amounts.
High-quality protein sources
Identify food ingredients rich in threonine.
Animal-based proteins such as chicken, fish, and beef are excellent sources of threonine. Plant-based proteins can also contribute, but animal sources are generally more bioavailable and complete in their amino acid profiles.
Homemade diets: proceed with caution
If preparing homemade diets, consult a veterinary nutritionist .
Homemade diets often lack essential nutrients, including threonine, if not properly formulated.
It is important to note that diets formulated by both veterinarians and non-veterinarians often do not meet nutritional requirements for cats.Thus, homemade diets should be formulated by board-certified veterinary nutritionists to ensure nutritional adequacy. Even when homemade diets have been formulated to meet nutritional adequacy recommendations, there may be variability in the exact nutritional composition of the ingredients. This makes it difficult to keep the nutrient content of homemade diets consistent between batches. There are also concerns with owners not closely following the recipe, as owners may switch ingredients or alter the preparatory methods of the recipe without consulting a veterinary nutritionist, which can lead to unbalanced diets.

Recognizing and preventing threonine deficiency
A deficiency in threonine can lead to several health problems in your cat. Being aware of these risks can help you take proactive steps to ensure your cat's well-being:
Muscle loss and weakness : threonine is vital for muscle maintenance, and a deficiency can result in muscle loss (sarcopenia) and general weakness. This can reduce your cat's mobility and overall quality of life.
Compromised immunity: inadequate threonine can weaken your cat's immune system, making them more susceptible to infections and diseases.
Poor gut health: a deficiency can disrupt the balance of gut microbes and compromise the intestinal lining, leading to digestive issues for your cat.
It's important to recognize that these issues can significantly affect your cat's overall quality of life, emphasizing the need for a balanced diet and adequate threonine intake.

What research reveals about threonine in feline health
Recent research provides valuable insights into the role of threonine in feline health, particularly in the context of chronic kidney disease (CKD). A serum metabolome study on client-owned cats with CKD revealed the following key findings:
Decreased Threonine Levels in Early-Stage CKD : threonine levels are decreased in cats with early-stage CKD compared to healthy cats, indicating that metabolic disturbances occur early in the disease process.
Further Reduction in Advanced CKD: as CKD progresses, threonine levels further decrease, highlighting the ongoing impact of the disease on amino acid metabolism.
Negative Correlation with Muscle Condition : threonine is negatively correlated with muscle condition score in CKD cats, suggesting a link between threonine deficiency and muscle wasting (cachexia) in these patients.
This study applied untargeted metabolomics, a technique used to comprehensively analyze the small molecules (metabolites) in a biological sample, to identify biomarkers of disease. By identifying changes in threonine levels and other metabolites, researchers can gain a deeper understanding of the metabolic pathways affected by CKD and potentially identify new therapeutic targets.
Is threonine supplementation right for your cat?
While a balanced diet should typically provide enough threonine, there are scenarios where supplementation might benefit your cat.
Cats with CKD may benefit from threonine supplementation to address metabolic imbalances and muscle wasting.
Older cats experiencing sarcopenia (age-related muscle loss) might also benefit.
Cats recovering from illness or surgery may have increased nutritional needs, including threonine.
Conclusion
The information in this article is based on the following scientific publications:
Buckley, C.M.F., Stevenson, A.E. and, A.H. (2011) Effect of dietary water intake on urinary output, specific gravity and relative supersaturation for calcium oxalate and struvite in the cat. British Journal of Nutrition, 106, pp. S128–S130.
Kritikos, G., Parr, J.M. and Verbrugghe, A. (2017). The Role of Thiamine and Effects of Deficiency in Dogs and Cats. Veterinary Sciences, 4(4), p. 59.
Nealon, N.J., Summers, S., Quimby, J. and Winston, J.A. (2024). Untargeted metabolomic profiling of serum from client‑owned cats with early and late‑stage chronic kidney disease. Scientific Reports, 14(1).
Sparkes, A.H., Caney, S., Chalhoub, S., Elliott, J., Finch, N., Gajanayake, I., Langston, C., Lefebvre, H.P., White, J. and Quimby, J. (2016). ISFM Consensus Guidelines on the Diagnosis and Management of Feline Chronic Kidney Disease . Journal of Feline Medicine and Surgery, 18(3), pp. 219-239.
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