Scientists Finally Know Why Cats Love Tuna So Much

by Nevena Nacic

Published: November 28th, 2023

Svetlana Rey/Shutterstock

No food is more synonymous with cats than tuna. Even the pickiest of cats can’t resist the tuna’s fishy flavor. Finally, scientists have learned why cats love tuna so much.

In the study published in the journal Chemical Sense, scientists report that cats, like humans, have receptors needed to detect umami flavor. Along with sweet, sour, bitter, and salty, umami is one of the five basic tastes.

Umami seems to be the cats’ favorite flavor. Considering that umami gives food a deep and savory meaty aroma, it’s no surprise that an obligate carnivore like a cat would prefer it over all other flavors.

The research team also found that cats’ taste receptors bind to two chemicals found in high concentrations in tuna. These chemicals boost the umami flavor, making cats obsessed with tuna.

“This is an important study that will help us better understand the preferences of our familiar pers,” says Yasuka Toda, a molecular biologist at Meiji University. According to Toda, this study could help cat food manufacturers create healthier food and more palatable medication for cats.

Previous studies showed that cats have a unique palate. Cats can’t taste sugar, because their sweet receptor gene is dysfunctional. Scientists believe that felines lose the ability to taste sweeteners and carbs because they don’t need these macronutrients to survive.

Cats also have fewer bitter flavor receptors than humans. This trait is commonly seen in obligated carnivores.

“Since discovering that cats don’t have a functional sweet taste receptor, we did wonder what they would respond to instead,” study lead author Scott McGrane, a sensory science expert at Waltham Petcare Science Institute, told Live Science.

Humans and other animals possess two genes - Tas1r1 and Tas1r3 that work together to detect umami flavor. Previous research has shown that cats express the umami-related Tas1r3 gene in their taste buds, but it was unclear whether they possess both genes needed to detect umami flavor.

The research team led by McGrane discovered that cats expressed both Tas1r1 and Tas1r3 genes in their taste buds. To learn this, the scientist biopsied the tongue of a six-year-old male cat that had been euthanized for health reasons unrelated to this study.

However, a closer look at the protein sequences encoded by these genes showed that they are very different from human genes. As it turned out, the main amino acids that activate umami flavor in people - glutamic and aspartic acid - were mutated in cats. “So I began thinking, maybe cats can’t taste umami,” said McGrane.

But, as it turned out, amino acids don’t bind to the cat umami receptor alone. Nucleotides, which are common in meat and yeast, bind to the cat receptor and glutamic and aspartic acid then have an enhancing effect. “That’s the exact opposite of what we see in people,” explained McGrane.

Cats love tuna because it contains the nucleotide inosine monophosphate. Tuna also contains large quantities of L-histidine, an essential amino acid for cats, that enhances umami flavor.

“The L-histidine content of tuna is much higher than of other fish species and meat sources.”

These new findings could be used for the development of tastier cat food and pharmaceuticals. Although cat food manufacturers already knew that cats prefer meaty flavors, they now have much more details about the compounds they can start working with.

It’s essential for manufacturers to ensure that animals want to eat the food they formulate and find it appealing.

“I think umami is as important for cats as sweet is for humans,” said Toda. Dogs, she explained, can taste both sweet and umami, which may explain why they’re not such fussy eaters.

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Nevena Nacic

Nevena is a freelance writer and a proud mom of Teo, a 17-year-old poodle, and Bob, a rescued grey tabby cat. Since childhood, she had a habit of picking up strays and bringing them home (luckily, her parents didn't know how to say NO). When she's not writing for her fellow pet parents, Nevena can be found watching Teo sleep. To her defense, that's not as creepy as it sounds!

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Folliculitis in dogs is a disease which causes infection or inflammation of hair follicles. It is one of the more common skin diseases amongst dogs and is caused by bacteria, fungal infections, skin irritations, or  parasites. What is more, it can affect dogs of all ages, sizes, and breeds, so if it happens to your four-legged friend unexpectedly, it is best to know how to treat this pesky skin issue.What Is Dog Folliculitis?The symptoms and causes of dog folliculitis can vary. In most cases, the healthy follicle is “compromised”, which leads to the accumulation of bacteria that are otherwise normally found on your pet’s skin. The end result is great discomfort for your dog, and it should be treated as quickly as possible. But how will you know that it is dog folliculitis and not some other health issue? Well, one of the foremost symptoms to look out for is red and inflamed skin. This condition causes excessive redness and even swelling in certain areas of the skin. This should be a telltale sign that something is amiss. Together with this, you could notice pimples, also known as pustules. They are small raised bumps and often contain pus. Of course, your dog will show signs of discomfort as well. They will try to itch and  lick the affected areas, in hopes of relieving the discomfort and making themselves more comfortable. This can all be accompanied by hair loss, mostly in the directly affected areas of your dog’s coat and skin. Ultimately, in the most severe cases, open sores, scabs, and skin lesions may appear. At this point, veterinary care is needed immediately.If you suspect your dog has folliculitis, it's crucial to consult with a veterinarian as soon as possible. They can perform diagnostic tests, such as skin scrapings or cultures, to identify the specific cause and recommend an appropriate treatment plan. It is crucial that you do not attempt any solution on your own. Self-diagnosis and do-it-yourself treatment can lead to complications or ineffective outcomes, so professional guidance is essential. Based on the evaluation, your vet can introduce a number of treatments and solutions – here’s what to expect.How Is Dog Folliculitis Treated?Topical antibiotics and antifungal creams are the most common treatment options. They are applied directly to the affected areas and are most efficient in early and moderate cases of dog folliculitis. Of course, if the case with your dog is more serious, your vet could propose an oral treatment. This consists of special medications that work to eliminate the infection at the core. Another possible solution is using special medicated shampoos that work to heal the follicles through gentle washing. 

A New Survey Shows Both Pets and Owners Feel Separation Anxiety

When you really love spending time with your pet, and vice versa, it is only natural that you feel sad when you are apart. For pets, this is often manifested as the dreaded  separation anxiety, which can cause a lot of issues both for them and their owners alike. While you know you are coming back from work – unlike your pooch – so you won’t feel as stressed about the time you spend away from your pet, that doesn’t mean that it won’t affect your mental health. The latest  survey from PetMed Express only proves that separation has an effect both on dogs and their pawrents.The results of this survey were recently released after being conducted by OnePoll, and they show us that pet parents – unsurprisingly – while out away for work or chores, will deeply miss their four-legged friends back at home. And, interestingly, the poll shows that the strain only got worse after the owners had to return to their offices after the Covid pandemic and the time they spent in their homes. "This research confirms what we already know: People love their pets and prioritize being with them," said Matt Hulett, President and CEO of PetMeds. "What's eye-opening is how many pet parents feel their own sense of separation anxiety and loneliness when they're away from their pets – a concept that underscores the pivotal role our pets play in our lives."The results indicate that 4 in 10 pet parents said that they would rather accept a lower salary and work from home, just so they could be closer to their furry friends. It is a sad truth and an everyday occurrence that owners have to endure the commute and long work hours and yearn for the company of their pets all the while. PetMeds claims that pet parents begin to miss their pets just 37 minutes after being apart, on average. Furthermore, the results show that on average they find themselves thinking about their pets about 13 times per day. Here are some other stats included:44% expressed worry about their pets experiencing separation anxiety52% have felt an increase in their own separation anxiety in the past two years42% said they have observed a change in their pet's mental health and behavior in the past two years48% said their pets follow them to the door and look sad when they leave63% would like more support and guidance in understanding their pet's health and behavior70% would try pet telehealth servicesWhat about you? How do you cope with being separated from your cherished four-legged friend?

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