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What happens when cats get fat? Scientists weigh in

As cats ate more and gained weight, gastrointestinal transit time was reduced, and so was digestive efficiency. When the body gets less food, it will be more efficient in extracting nutrients. But when the amount of food increases, it passes through the digestive system faster and fewer nutrients are extracted in the process

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Cat owners want Kitty to be happy, but providing an abundance of food and snacks can have unintended consequences. Feline obesity is on the rise, impacting the health, longevity, and wellbeing of cats. A new study from the University of Illinois Urbana-Champaign looks at what happens in the digestive system and gut microbiota when cats eat too much.

“About 60% of cats in the U.S. are overweight, which can lead to health problems such as diabetes and chronic inflammation. While many studies have investigated feline weight loss, there has been little focus on the opposite process, which is also important. In this study, we wanted to learn more about the metabolic and gastrointestinal changes that occur as a result of overeating and weight gain in cats,” says study co-author Kelly Swanson, professor in the Department of Animal Sciences and interim director of the Division of Nutritional Sciences (DNS), part of the College of Agricultural, Consumer and Environmental Sciences (ACES) at U. of I.

The study included 11 adult spayed female cats. They were fed a standard dry cat food and after two weeks of baseline measurements, they were allowed to eat as much as they wanted. The researchers collected blood and fecal samples at regular intervals and monitored physical activity.

Once the cats were able to overeat, they immediately increased their food intake substantially and started to gain weight. At the onset of the study, their average body condition score (BCS) was 5.41 on a 9-point scale. After 18 weeks of overfeeding, it had increased to 8.27, corresponding to being 30% overweight. BCS is equivalent to body mass index (BMI) for humans, and 6 or above is considered overweight, Swanson said.

The researchers analyzed changes in fecal output, gastrointestinal transit time, digestive efficiency (nutrient digestibility), and microbiota bacterial composition over the 20-week duration of the study.

“We found that as cats ate more and gained weight, gastrointestinal transit time was reduced, and so was digestive efficiency. When the body gets less food, it will be more efficient in extracting nutrients. But when the amount of food increases, it passes through the digestive system faster and fewer nutrients are extracted in the process,” Swanson explained.  

The researchers also found significant changes in gut microbial composition between the lean cats at baseline and after 18 weeks of weight gain. The relative abundance of Bifidobacterium, which has antimicrobial activity, inhibits pathogens, and stimulates the immune system, increased, while Collinsella, which degrades fiber and has been linked to pro-inflammatory diseases, decreased. These results are opposite to what has been measured in overweight humans and suggest that their association to weight gain is complex, Swanson noted.   

“The change in the gastrointestinal transit time was a novel finding and a potential reason for the change in fecal microbiota. Future studies should consider measuring transit time to better explain modifications to the microbiome of pets,” he added. 

As the cats’ food consumption grew, so did their fecal output. In other words, as they ate more, they also pooped more. At the same time, fecal pH decreased, meaning that the stool became more acidic.

“In humans, a low fecal pH indicates poor absorption of carbohydrates and fat. Our findings correlate with this, as reduced fecal pH aligned with higher food intake and reduced digestibility,” Swanson said.

The researchers also measured the cats’ activity level with a monitor attached to a collar. The cats were housed in a group setting where they were able to interact with each other and play with toys, except for the days when stool samples were collected.

“We expected that weight gain might lead to decreased physical activity, but we did not observe any consistent changes in activity level. However, this could vary with individual cats and their environment, and how much their owners interact with them,” Swanson stated.

Understanding the metabolic and gastrointestinal changes that occur with weight gain and obesity in pets may help with future prevention and treatment plans, the researchers conclude.

Pet owners who want to help their cats lose weight can employ various strategies. In another new study, Swanson and his co-authors showed that restricted feeding can promote safe weight and fat loss in cats. The researchers also suggest pet parents encourage activity in their feline companions. For example, they can stimulate foraging by placing food around the home, or use food puzzles during mealtime to promote engagement and mental enrichment.

After the conclusion of the weight gain study, the 11 cats were put on a restricted-feeding diet that helped them return to normal weight.

The first study, “Effects of overfeeding on the digestive efficiency, voluntary physical activity levels, and fecal characteristics and microbiota of adult cats,” is published in the Journal of Animal Science. Authors are Danielle Opetz, Patricia Oba, and Kelly Swanson.

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Pet Care

Pet dog microbiota may protect young children from respiratory tract infections and reduce the need for antibiotic courses

Children who have been in contact with dogs in early childhood are on average healthier and require fewer antibiotic courses than children without such contact.

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Children who have been in contact with dogs in early childhood are on average healthier and require fewer antibiotic courses than children without such contact. The protective association is explained, at least in part, by the spread of dog-associated microbes in the home.

In the recent study, the presence of specific dog-associated microbes in the home were linked to fewer respiratory tract infections, fewer antibiotic courses and more healthy weeks during the child’s first year of life. The richness and diversity are higher in homes with a dog than in homes without a dog, but these general characteristics of the microbiota were not associated with the incidence of respiratory tract infections or morbidity in the child.

The study shows that certain dog-associated microbes or their combinations can explain up to one quarter of the protective effect of dog ownership on children’s respiratory tract infections, antibiotic use and the number of healthy weeks during the first year of life.

The protective effect of a dog ownership remained also after accounting for other factors known to influence childhood infection risk, including family size, living environment and exposure to tobacco smoke. In addition to the dog’s microbiota, a more outdoor-oriented lifestyle in dog-owning families, shared responsibilities related to caring for the dog and partly similar dietary habits shared among dog owners may influence the microbiota in the home and among its inhabitants, and thereby the development of the child’s resistance to pathogens. These factors were not examined in this study.

“The results strengthen our understanding that the microbial environment during early childhood plays an important role in the development of child’s immune system. It has been suggested that in the future it may be possible to modify the home microbiota in ways that promote health. Our study shows that dog ownership already does this today,” says paediatrician Jenni Mäki.

“Respiratory tract infections in early childhood are a significant risk factor for asthma. When some of children’s respiratory tract infections can be prevented with dog-associated microbes, this may also reduce the child’s risk of developing asthma later in life,” says chief researcher Anne Karvonen.

The LUKAS study included nearly 400 families from Finland. About one third of the families lived on farms, half in rural areas and the rest in towns.

The study was carried out by the Finnish Institute for Health and Welfare, Kuopio University Hospital and the University of Eastern Finland.

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Pet Care

Keeping kitty indoors is not the cat-astrophe that owners fear

Owners often need reassurance that the behaviours they see during the transition are temporary and that there are practical strategies – such as providing climbing spaces, scratching posts, toys and opportunities for play – that can help cats adapt successfully.

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Moving a pet cat from an outdoor lifestyle to living indoors is easier than many owners expect, according to new research that could help improve feline welfare, protect wildlife, and ease concerns about keeping cats contained.

Australian and New Zealand researchers surveyed 87 cat owners, revealing that most who transitioned their pets to indoor living reported the change was ultimately worthwhile, with the benefits to both cats and owners outweighing the challenges.

The study, published in Applied Animal Behaviour Science, found that while owners initially worried about their cat’s happiness and behaviour, more than two-thirds said the process was easier than expected.

Lead author Dr Julia Henning, from Adelaide University’s School of Animal and Veterinary Sciences, said the findings challenge the perception that cats cannot adapt to an indoor lifestyle.

“Many people worry that keeping a cat indoors will be stressful for their cat, but our findings suggest that the transition was often easier than expected,” Dr Henning said.

“Owners certainly faced some challenges during the transition, particularly in the first few weeks, but most found these were temporary and that the long-term benefits far outweighed the difficulties.”

The research found cat safety was the strongest motivation for moving cats indoors, with owners concerned about road traffic, attacks by other animals, disease, parasites, poisoning and cats’ threats to local wildlife, particularly birds. After the transition, these same issues were overwhelmingly cited as the greatest benefits, alongside improved peace of mind.

Owners also reported being better able to monitor their cat’s health, spending more quality time with their pet and, in many cases, experiencing closer bonds with their cats.

The study found approximately half of the cats adjusted to indoor living within a matter of weeks, while younger cats generally adapted more quickly than older animals.

However, the research also identified several common challenges. Cats were more vocal, scratched at doors and windows, or appeared frustrated during the adjustment period. Owners also reported concerns about providing enough environmental enrichment, maintaining litter trays and preventing weight gain.

Moving cats indoors increased some costs (including food, litter and household modifications), however veterinary costs reduced over time because their cats faced fewer injuries and health risks associated with roaming.

Many owners described feelings of guilt about restricting their cat’s freedom, despite believing they were making the safest decision for their pet. Others worried their cat might become bored or unhappy indoors.

Senior author Dr Susan Hazel, from Adelaide University, said these findings highlight the importance of supporting both pets and their owners.

“Keeping cats indoors offers significant benefits for their safety and welfare, but successful transitions depend on supporting owners as much as their cats,” Dr Hazel said.

“Our research shows that owners often need reassurance that the behaviours they see during the transition are temporary and that there are practical strategies – such as providing climbing spaces, scratching posts, toys and opportunities for play – that can help cats adapt successfully.”

The study also found that transitioning cats indoors was often prompted by unexpected events, including injuries, illness, moving house or sudden safety concerns. More than one-third of owners reported having little or no time to prepare, while almost half made no preparations before the transition.

Despite this, most owners still described the experience as easier than anticipated.

Researchers say the findings highlight the need for readily accessible information and practical resources to help owners make the transition successfully, particularly when circumstances change unexpectedly.

Owner-reported experiences of transitioning cats from outdoor to indoor living’ is published in Applied Animal Behaviour Science. The authors are from Adelaide University, Companion Animals New Zealand, EthicoNZ Ltd and Navigate Welfare.

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Pet Care

Tips for smooth travel with pets

The American Veterinary Medical Association (AVMA) recommends planning ahead for calm, comfortable trips for you and your pets.

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The American Veterinary Medical Association (AVMA) recommends planning ahead for calm, comfortable trips for you and your pets.

According to AVMA President, Dr. Michael Q. Bailey, visit your veterinarian to make sure your pet is current on all vaccinations and you have all the paperwork and medications necessary for your journey.

“Summer travel is exciting, but it comes with real responsibilities for pet owners that are easy to overlook,” said Dr. Bailey. “Before you head out, talk to your veterinarian. Whether your pet is coming along or staying behind, a little preparation can make all the difference.”

Bailey’s advice begins with considering whether travel is right for your pet, as some dogs, cats, and other animals may be uncomfortable with travel due to illness, injury or temperament. Consider a pet sitter or boarding your pet if there’s a chance they may not be comfortable traveling. If you’ve decided to bring your pet along, here are the AVMA’s top pet travel tips:

The Basics

  • Ensure your pet has up-to-date ID tags and a microchip.
  • Introduce your pet to their carrier and travel harness before the trip. Placing a familiar toy or blanket in the carrier can help your pet feel more comfortable.
  • Check your airline’s or carrier’s pet travel policies before you depart.

What to Bring

  • Proof of vaccination, pet ID info, and a recent photograph.
  • Leash, water dish, waste bags, blankets, treats, car carrier, toys and a pet first aid kit.
  • Enough food to last the entire trip.
  • Your pet’s medications and your veterinarian’s phone number.

For Added Comfort and Safety

  • Research a list of veterinarians in your destination in case of emergency.
  • Offer your pet water frequently, and take time for exercise and bathroom breaks.
  • Never, ever leave your pet alone in a parked car.
  • If you plan to stay in a hotel, motel, park, or campground, ask if there are any breed or size restrictions; if any paperwork is required; and what features they may offer to meet your pet’s needs.

For more information, visit www.avma.org.

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