How to Help Your Hyperthyroid Cat Gain Weight

When you have a senior cat diagnosed with hyperthyroidism, one of your primary concerns might be weight loss. As our feline companions age, health conditions can lead to significant weight reduction, causing stress and worry to their loving owners. This article provides expert insights into how you can help your hyperthyroid cat regain and maintain a healthy weight.

Understanding Hyperthyroidism in Cats

Hyperthyroidism is a common condition in older cats, characterized by the overproduction of thyroid hormones. This overproduction increases the cat’s metabolism, often leading to symptoms such as weight loss, increased appetite, hyperactivity, and frequent urination. Addressing weight loss in hyperthyroid cats requires a tailored approach that takes their unique dietary needs into consideration.

What to Feed Your Hyperthyroid Cat: The Basics

Choosing the Right Cat Food

One common recommendation is high-quality kitten food. Kitten food is more nutrient-dense and calorically rich than regular adult cat food, making it an excellent choice for senior cats needing to put on weight. Do consider consulting with your vet before making a drastic change in your cat’s diet.

Consider Adding Healthy Fats

Adding a small amount of healthy fats to your cat’s diet can also be beneficial. Try adding a half teaspoon of duck fat or clarified butter to their food. However, remember that too much fat can lead to digestive issues, so moderation is key.

Rotisserie Chicken and Bone Broth

Incorporating rotisserie chicken and homemade bone broth into your cat’s diet can provide a protein and calorie boost. Be sure to remove any skin and bones before offering it to your cat to prevent choking and gastrointestinal issues.

High-Calorie Wet Food and Dry Food with Fillers

High-calorie wet food can be a great option for helping your cat gain weight, especially if they prefer wet food. Dry food with fillers, such as Meow Mix or Fancy Feast, is another good option as they are typically higher in calories.

Tailored Recommendations for Hyperthyroid Cats with Kidney Disease

If your senior cat is also dealing with Chronic Kidney Disease (CKD), you’ll need to tailor their diet even more. Cats with CKD often need a low-protein, low-phosphorus diet, which can make weight gain challenging. However, there are specially formulated renal diets available that are both kidney-friendly and calorie-dense. Always remember to consult with your vet before introducing a new diet.

Fiber and Weight Gain

For some cats with hyperthyroidism, incorporating fiber into the diet can help with weight gain. You might consider a food with a higher fiber content or adding a fiber supplement to their current food.

Keeping Your Cat Hydrated

Ensuring your cat stays well-hydrated is also important, especially if they’re on a dry food diet. Adding some water to their food or feeding them a wet food diet can help prevent dehydration.

Important: Regular Vet Check-ups

Regular veterinary check-ups are critical when managing hyperthyroidism and weight issues in cats. This allows for early detection and management of potential complications.


What is the best food to feed a cat with hyperthyroidism?

High-quality, nutrient-dense foods such as kitten food or high-calorie wet food are often recommended for cats with hyperthyroidism. It’s also beneficial to incorporate small amounts of healthy fats and high-protein foods, like rotisserie chicken, into their diet. However, remember that each cat’s needs can vary, so it’s crucial to consult your vet before making dietary changes.

Do cats gain weight with hyperthyroidism?

Typically, cats with hyperthyroidism lose weight due to their increased metabolic rate, even if their appetite improves and they eat more. The weight loss occurs because the overactive thyroid gland is causing their body to burn calories at a faster rate. Therefore, weight gain isn’t generally associated with hyperthyroidism. If your cat is gaining weight while suffering from hyperthyroidism, it’s essential to consult your vet as this could indicate an underlying issue.

Are cats with hyperthyroidism skinny?

Yes, one of the primary symptoms of hyperthyroidism in cats is significant weight loss, leading them to appear skinny or underweight. This happens despite them often having an increased appetite.

Why does my hyperthyroid cat keep losing weight?

Your hyperthyroid cat continues to lose weight because the excess thyroid hormones increase their metabolism, causing them to burn calories and lose weight rapidly. This continues even if they’re eating more than usual.

How often should you feed a cat with hyperthyroidism?

Hyperthyroid cats often have a bigger appetite and may benefit from multiple small meals throughout the day, rather than one or two large ones. This can help maintain their energy levels and potentially help with weight gain. However, the exact feeding schedule should be determined in consultation with your vet, taking into account your cat’s specific health conditions and lifestyle.

What is the best non-prescription cat food for hyperthyroidism?

While prescription cat food may be necessary for some cats with hyperthyroidism, non-prescription alternatives can also be beneficial. High-quality, nutrient-rich foods like kitten food, high-calorie wet food, or dry food with fillers can be good options. However, it’s essential to consult with your vet before introducing new foods into your cat’s diet.

What are some homemade cat food options for hyperthyroid cats?

Homemade diets for hyperthyroid cats should be carefully balanced and nutritious. High-protein foods like cooked chicken, turkey, or fish can be good options. Incorporating small amounts of healthy fats and high-fiber veggies can also be beneficial. Always consult with your vet or a pet nutritionist before starting a homemade diet to ensure it meets your cat’s nutritional needs.

What to feed a cat with hyperthyroidism and kidney disease?

When a cat has both hyperthyroidism and kidney disease, the dietary requirements can be complex. Generally, a low-protein, low-phosphorus, and high-calorie diet is recommended. Some commercial cat food brands offer specific formulations for this condition. Consultation with your vet is crucial in these cases to create a tailored feeding plan that supports both conditions.

How can I manage my cat’s hyperthyroidism symptoms?

Management of hyperthyroidism in cats often involves a combination of medication, diet, and sometimes, surgical intervention. Medications like Methimazole are commonly used to regulate the overproduction of thyroid hormones. Diet can also play a significant role, with nutrient-dense, high-quality foods being beneficial. In some cases, surgical removal of the thyroid gland or radioactive iodine therapy may be recommended. Regular vet check-ups are crucial to monitor your cat’s condition and adjust treatments as needed.

Can hyperthyroidism in cats be cured?

While hyperthyroidism in cats can’t be cured per se, it can be effectively managed with the right treatments and care. In some cases, surgical intervention or radioactive iodine therapy can provide long-term resolution of symptoms. However, ongoing management, including regular vet check-ups, medication, and dietary control, is often required.

Is there a specific diet for cats with hyperthyroidism?

There’s no one-size-fits-all diet for cats with hyperthyroidism, but there are some general guidelines that can help. Foods should be high in quality protein and nutrients to counteract the increased metabolic rate caused by hyperthyroidism. High-calorie foods can help combat weight loss, and small, frequent meals can help maintain stable energy levels. However, the best diet for your cat will depend on their individual needs, including their age, overall health, and whether they have other health conditions like kidney disease.

Can cats with hyperthyroidism eat fish?

While cats typically love fish, and it can be a good source of protein, it’s essential to limit their intake due to concerns about mercury levels, which can potentially exacerbate hyperthyroidism. Small amounts of cooked fish can be included in their diet, but it should not be the main protein source. Always consult your vet for personalized advice on feeding fish to your hyperthyroid cat.

Should hyperthyroid cats be fed dry or wet food?

Both wet and dry foods can be suitable for cats with hyperthyroidism, and the best choice will depend on your cat’s personal preferences and health needs. Wet food can be beneficial if your cat needs to gain weight or stay hydrated, while dry food can be more convenient and help maintain dental health. It’s important to choose high-quality foods that are rich in nutrients, regardless of whether they’re wet or dry.

What is the life expectancy of a cat with hyperthyroidism?

With proper management and treatment, cats with hyperthyroidism can live many healthy and comfortable years. The prognosis depends on factors such as the cat’s overall health, age, and whether they have other concurrent health conditions. Regular veterinary care is essential for managing hyperthyroidism and ensuring your cat has the best quality of life possible.

Can hyperthyroidism cause behavioral changes in cats?

Yes, hyperthyroidism can lead to various behavioral changes in cats. Some cats may become more active or restless, display increased appetite, drink more water, or urinate more frequently. Some cats may also show signs of nervousness, aggression, or vocalization due to the increased metabolic activity caused by excess thyroid hormones.

Is hyperthyroidism painful for cats?

Hyperthyroidism itself is not typically painful for cats, but it can lead to uncomfortable symptoms. These include rapid heart rate, increased appetite, weight loss, and potentially vomiting or diarrhea. It’s crucial to manage these symptoms through appropriate treatment to ensure your cat’s comfort.

How can I help my cat gain weight while dealing with hyperthyroidism?

To help your cat gain weight, focus on providing a nutrient-dense, high-quality diet. Foods formulated for kittens or high-calorie wet foods are often beneficial. Some owners find success adding small amounts of healthy fats to their cat’s food. Regular, small meals can also help. Always consult with your vet to ensure the dietary plan supports your cat’s overall health needs.

Is hyperthyroidism in cats contagious?

No, hyperthyroidism is not contagious. It is an endocrine disorder caused by an overproduction of thyroid hormones and cannot be spread from one cat to another.

How is hyperthyroidism diagnosed in cats?

Hyperthyroidism is typically diagnosed through blood tests that measure the level of thyroid hormones in your cat’s blood. Your vet may also perform a physical examination, checking for an enlarged thyroid gland. In some cases, further diagnostic tests like ultrasound or scintigraphy may be used.

What are the side effects of hyperthyroidism medication in cats?

While medication can effectively manage hyperthyroidism in cats, it can also lead to side effects. These can include vomiting, lack of appetite, lethargy, and in rare cases, blood cell abnormalities. It’s crucial to monitor your cat closely while on medication and report any unusual symptoms to your vet.

Can hyperthyroidism in cats cause constipation?

While not a common symptom, constipation can occur in some cats with hyperthyroidism. This may be related to dehydration, as hyperthyroid cats often urinate more and might not drink enough to compensate. If your cat is constipated, consult with your vet to determine the best course of action.

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