The Best Diet for Cats with Hyperthyroidism

Are you concerned about your cat’s hyperthyroidism? Get the insight you need for your pet’s health: discover the best diet for cats with hyperthyroidism. You can help your pet live a long, healthy life.

Quick facts: Best Diet For Cats With Hyperthyroidism

  • ✅ Cats with hyperthyroidism need a diet low in iodine, with sources including fish, rice, eggs, and meat (Source: Tufts University Veterinary Medicine).
  • ✅ Food that is high in fiber, such as pumpkin, can help cats with hyperthyroidism maintain a healthy weight (Source: PetMD).
  • ✅ High protein diets, such as those with beef or chicken, can help reduce metabolism in cats with hyperthyroidism (Source: The Journal of Feline Medicine and Surgery).
  • ✅ Limited carbohydrate intake, such as with a grain-free diet, can help reduce the symptoms of hyperthyroidism (Source: Veterinary Medicine).
  • ✅ Omega-3 fatty acids can help reduce inflammation in cats with hyperthyroidism (Source: The Journal of Feline Medicine and Surgery).
  • Checkout this video:

    Overview of Hyperthyroidism in Cats

    Hyperthyroidism is a common condition in cats and can have serious consequences. It is caused by an overproduction of the thyroid hormone and can lead to increased appetite, weight loss, increased drinking, and increased urination.

    Managing your cat’s diet is an important part of managing the condition and alleviating its symptoms. Let’s take a closer look:

    Symptoms of Hyperthyroidism

    Hyperthyroidism in cats is a common hormonal disorder that is caused by an overproduction of the hormone thyroxine. Symptoms of this condition can vary, but some of the most common ones include:

    • Increased appetite
    • Weight loss
    • Excessive thirst or urination
    • Restlessness
    • Vomiting
    • Diarrhoea
    • Soft coat
    • Increased heart rate and panting

    Cat owners might notice that their cat has lost muscle mass, is less active and appears to be uninterested in playing. Hyperthyroidism can also cause behavioural changes such as aggression towards people or other animals and hyperactivity/restlessness. If left untreated for too long, hyperthyroid cats may develop other health problems such as hypertension (high blood pressure), anemia (low red blood cell count), kidney failure and even heart problems.

    It’s important to get your cat checked by a vet if you suspect they have this condition so it can be appropriately treated with drugs or diet changes.

    Diagnosis and Treatment

    Hyperthyroidism in cats is a condition caused by an overactive thyroid gland, which increases the metabolic rate of cats. It can be diagnosed with a combination of a physical exam, blood work, and sometimes an ultrasound. If a cat has been diagnosed with hyperthyroidism, treatment options include oral antithyroid drugs (Methimazole) and radioiodine ablation. In both cases, the goal is to restore euthyroid state (normal levels of hormones).

    In addition to medical management for hyperthyroidism in cats, diet plays an important role in providing appropriate nutrition and energy balance for felines with this condition. A veterinarian may recommend feeding a low-iodine diet that is high in protein but low in fat/calories, to help maintain an ideal body weight while providing optimal nutrition for cats with hyperthyroidism. Look for commercial diets labeled as “light” or “weight management” that are formulated specifically for cats with elevated thyroid hormone levels.

    Nutritional Needs of Cats with Hyperthyroidism

    Cats with hyperthyroidism have an imbalance of hormones which can lead to many other health issues. In order to keep your cats healthy and manage the symptoms of hyperthyroidism, it is important to provide them with a balanced diet. Understanding the nutritional needs of cats with hyperthyroidism is essential to ensuring that they get all the nutrients they need to stay healthy.

    Let’s take a closer look at the best diet for cats with hyperthyroidism:


    Macronutrients refer to the nutrients cats require in larger amounts: proteins, fats, and carbohydrates. While it is true that cats are carnivores and require more protein in their diet than any other nutrient, quality fats and carbohydrates can be just as important for their overall health.

    When providing the optimal diet for cats with hyperthyroidism, owners should look for a food that meets at least 30% of its calories from high-quality animal proteins. High-fat diets may also be beneficial as they provide cats with energy without increasing glucose levels. Lastly, complex carbohydrates like legumes (i.e., peas) provide an energy source for cats without going overboard on calories or simple sugars like grains.

    The best diets for cats with hyperthyroidism provide

    • essential fatty acids,
    • digestible proteins, and
    • low glycemic index carbohydrates

    in balanced ratios appropriate to a cat’s lifestyle.

    Macronutrient Ratios

    Cats with hyperthyroidism are typically dietary managed with a low-iodine diet. Macronutrient ratios, or the balance of proteins, carbohydrates and fat in a cat’s diet, can also be important in helping to regulate the animal’s thyroid levels. The American Association of Feline Practitioners recommends that adult cats should receive a diet with a minimum of 2.5 – 3 percent of calories from fat and a minimum of 25 percent from protein. Carbohydrates can provide most or all of the remaining calories as long as they are easily digestible.

    When selecting therapeutic diets for cats with hyperthyroidism, it is best to choose foods without added vegetable oils and those that contain no more than 20 percent carbohydrates on a dry matter basis. Foods that are designed specifically for cats with hyperthyroidism will have these nutrient ratios pre-determined by their manufacturers.

    Vitamins and Minerals

    Vitamins and minerals play an important role in a cat’s overall health and well-being, especially those with hyperthyroidism. Cats with this condition cannot create certain vitamins and minerals, so it is important to supplement their diets with food that is high in these essential nutrients.

    For instance, cats need:

    • Vitamin A for healthy vision and skin;
    • Folic acid for proper cell formation and growth;
    • Taurine for normal heart function and healthy digestion;
    • Zinc for normal growth cycle and appetite regulation;
    • Magnesium to promote a healthy immune system;
    • Cobalt to create Vitamin B12;
    • and other trace elements such as copper which helps form red blood cells.

    Therefore it is absolutely necessary that cats with hyperthyroidism receive the nutrient-rich food necessary to help them maintain their health.

    Types of Foods to Avoid

    When it comes to managing hyperthyroidism in cats, one of the key elements is to choose the right diet. It is important to avoid foods that are high in iodine, as it can lead to increased symptoms in affected cats.

    Some types of foods that should be avoided include:

    • Raw fish and seafood
    • Dairy products
    • Processed meats

    We will discuss more in detail below.

    High-Carbohydrate Foods

    High-carbohydrate foods should be avoided when feeding cats with hyperthyroidism. While carbohydrates are important sources of energy for cats, if fed in excess, it can cause excessive weight gain and worsen the condition.

    High-carb foods to avoid include:

    • Grain-based foods
    • Processed cat food
    • Sugary treats or snacks

    These foods can increase blood sugar levels, leading to an increase in insulin production which can promote fat storage and contribute to weight gain. Additionally, microscopic organisms such as yeast feed on carbohydrates and can cause exacerbated symptoms in cats with Hyperthyroidism. Avoiding high-carbohydrate foods will help ensure that your cat’s diet is aimed at controlling the Hyperthyroidism instead of adding additional stressors to their system.

    High-Fat Foods

    High-fat foods are not recommended for cats with hyperthyroidism, as these can contribute to weight gain. Weight gain is one of the main symptoms of hyperthyroidism in cats, and gaining too much weight can have a negative effect on the cat’s overall health. High-fat foods tend to be high in calories, which can cause unhealthy weight gain if consumed regularly.

    Foods that are high in fat that cats should avoid include:

    • Processed meats (such as bacon and sausage)
    • Fatty cheese
    • Fried and greasy foods
    • Dairy products (including cream or sour cream)
    • Roasted nuts

    Cats with hyperthyroidism should stick to lean proteins (such as chicken or whitefish) and whole grains to keep their calorie consumption in check.

    Foods with Artificial Sweeteners

    Foods with artificial sweeteners should be avoided when caring for cats with hyperthyroidism. Artificial sweeteners, such as aspartame, sucralose, and saccharin, have been linked to many health conditions in humans and are believed to cause cancer and other diseases in animals. These sweeteners can also affect cats’ metabolism by raising their insulin levels and making them crave sugar, thus exacerbating their existing medical conditions.

    Since most processed, packaged cat foods contain artificial sweeteners, it is best to avoid food products that contain this ingredient. Additionally, try to give your cat mostly natural food sources like mashed pumpkin or canned small fish that provide essential nutrients without the adverse effects of artificial sweeteners. Limit treats containing artificial sweeteners to manage your cat’s symptoms more effectively.

    Types of Foods to Include

    When it comes to selecting foods for cats with hyperthyroidism, it is important to select foods that are high in protein, low in fat, and low in carbohydrates. It is also important to choose foods that are free from preservatives, additives, dyes, and artificial flavors. Additionally, cats with hyperthyroidism should avoid foods that contain high levels of iodine, as this can worsen the condition.

    Let’s look at some of the best types of food for cats with hyperthyroidism:

    High-Protein Foods

    High-protein foods are an important element of any diet designed to assist cats with hyperthyroidism. Protein helps cats build muscle, and it also serves as a source of fuel for the body. Protein sources high in amino acids should be included in the cat’s diet, such as lean chicken and beef, as well as eggs and fish. Additionally, soy is a great source of protein for cats and can also help reduce their cholesterol levels. Canned tuna is another great option, providing both essential fatty acids and vitamins that cats need.

    It’s important to avoid human junk food like potato chips or candy; these offer no nutritional value for cats and can make symptoms worse. Aim to provide your cat with lean proteins from natural sources to get the best nutrition possible.

    Low-Carbohydrate Foods

    Cats with hyperthyroidism often require a special diet that is low in carbohydrates. Low-carbohydrate foods are rich in protein and fat, rather than simple carbs like sugar and refined grains. These foods can help to regulate blood sugar levels, slow down the absorption of glucose, and decrease inflammation.

    Examples of low-carbohydrate diets that are beneficial for cats with hyperthyroidism include:

    • Homemade cat food recipes featuring lean sources of animal protein such as chicken, turkey, fish and egg whites;
    • Sources of healthy fat such as olive oil;
    • Vegetables such as spinach, kale and broccoli;
    • Plus moderate amounts of grains such as quinoa and oats.

    Additionally, cats with this condition may benefit from supplemental omega-3 fatty acids like those found in sardines and tuna.

    Low-carbohydrate diets for cats should be composed mostly of fresh meats with little or no added salt or preservatives, combined with whole grains and vegetables that provide plenty of fiber.

    Low-Fat Foods

    Low-fat foods are an essential component of a diet for cats with hyperthyroidism. Low-fat foods help to keep your cat’s overall calorie and fat intake low, which is important for helping to slow down the overactive thyroid.

    When selecting food for a cat with hyperthyroidism, look for foods that have less than 10% fat content. A good rule of thumb is the lower the fat content, the better, as long as it is still providing all of your cats nutritional needs. If you are using a canned food, look for recipes where evidence-based meat proteins make up at least 70% of the total ingredients. You can also feed your cat human grade cooked lean meats such as chicken breast or turkey breast if desired.

    Avoid any foods containing added animal fats as these can further contribute to symptoms of an overactive thyroid gland.

    Sample Meal Plan

    A healthy diet is essential for cats suffering from hyperthyroidism. This can be difficult to balance when considering their special dietary needs. Therefore, it’s important to have a well-thought-out sample meal plan to ensure proper nutrition for these cats. Let’s go over the do’s and don’ts of a meal plan for cats with hyperthyroidism:

    • Do’s:
    • Don’ts:


    Breakfast is the best time for cats with hyperthyroidism to start their day off right. An optimal meal plan could include high-protein foods such as boiled chicken, fish or turkey, accompanied with a small amount of cooked vegetables. It’s important to look out for signs of digestive issues when adding new foods to your cats’ diet, so keep an eye on their bowel movements and energy levels after introducing anything new.

    Additionally, make sure the meals are always freshly cooked and that they’re not stored in the refrigerator or freezer too long. Fresh foods will help prevent health problems related to food spoilage due to improper storage methods. Give your cat plenty of fresh water throughout the day as well!


    Lunch is an important meal of the day for cats with hyperthyroidism. Since cats with hyperthyroidism are often unable to absorb nutrients, it’s important to provide them with a meal that is not only high in protein, but also easily digestible.

    High-protein canned cat food is a great option as it contains a balanced amount of dietary protein and fat but is easily digestible. Other good options include:

    • Cooked/canned fish such as mackerel or tuna
    • Cooked chicken
    • Boiled eggs
    • Cooked legumes such as lentils or chickpeas.

    Avoid feeding your cat raw meats as this may carry certain bacteria that could make your cat sick. Additionally, make sure to feed your cat a variety of foods throughout the week so they can receive adequate nutrition from their meals.


    When feeding cats with hyperthyroidism, dinner is the most important meal of the day. A dinner meal that is high in protein and low in carbohydrates should be given to cats with this condition. For this, you can opt for a wet or canned food as well as a dry food that has grain-free options.

    When looking for grain-free options, make sure to check for peas, legumes and potatoes, as these are all sources of carbohydrates and should be avoided when looking for a meal plan for cats with hyperthyroidism. The dinner meal should also contain taurine to help maintain the cat’s overall health. Additionally, omega-3 fatty acids are beneficial and can help reduce inflammation associated with hyperthyroidism.

    As always, if you have any questions about your cat’s specific dietary needs, consult with your vet before making any changes.


    Snacks are an important part of a meal plan for cats with hyperthyroidism. Snacks should be low in calories and carbohydrates, and high in protein. Some great snack options for cats with hyperthyroidism are:

    • High-quality, protein-rich wet food such as tuna, salmon, or chicken;
    • Canned or freeze-dried lactose free yogurts;
    • Cooked eggs;
    • Boiled chicken breast;
    • Canned mackerel; and
    • Small amounts of cheese.

    Fresh edible greens like spinach, kale, dandelion leaves, parsley, and celery are also safe snacks your cat can enjoy. Keep in mind that all snacks should be fed in moderation and monitored to ensure your cat isn’t overeating.

    FAQs about: Best Diet For Cats With Hyperthyroidism

    Q1: What are the best foods for a cat with hyperthyroidism?

    A1: Cats with hyperthyroidism should be fed a diet high in protein and low in carbohydrates. It is best to feed them high-quality wet cat food with a low-iodine content. Some examples of these diets include Hill’s Prescription Diet y/d or Purina Pro Plan Veterinary Diets NF Kidney Function.

    Q2: Should I give my cat with hyperthyroidism any supplements?

    A2: Yes, it is recommended that cats with hyperthyroidism be given a daily supplement of zinc, omega-3 fatty acids, and B-complex vitamins. These supplements can help support the cat’s health and help reduce the symptoms of hyperthyroidism.

    Q3: How often should I feed my cat with hyperthyroidism?

    A3: It is recommended that cats with hyperthyroidism be fed small, frequent meals throughout the day. This helps them to maintain a consistent blood sugar level, which is important for managing their condition.

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