Chronic kidney disease is one of the most common and serious health problems affecting older cats.
Veterinarians have long known that domestic cats develop kidney disease much more often than many other animals, but the reasons behind this vulnerability have remained unclear.
Now, a new study suggests that unusual types of fats inside cats’ kidneys may help explain why.
Researchers from the University of Nottingham have discovered that domestic cats accumulate rare forms of fat inside kidney cells, sometimes starting from a very young age.
The findings, published in Frontiers in Veterinary Science, reveal a surprising biological difference between cats and other mammals.
The study was led by David Gardner and Rebecca Brociek from the university’s School of Veterinary Medicine and Science.
Using advanced chemical analysis, the researchers examined fats stored in kidney tissue and found that cats accumulate a rare group of modified triglycerides.
Triglycerides are the most common type of fat in the body and are normally used to store energy from food.
However, the fats found in cat kidneys were unusual. Some had uncommon chemical structures, including branched shapes or special chemical bonds that are rarely seen in other mammals.
Many of these fats also contained what scientists call ether linkages, which make them behave differently from ordinary fats found in food or body tissues. This unusual chemistry may affect how the fats are processed or stored inside cells.
To understand whether this feature was unique to domestic cats, the researchers also studied other animals. Dogs did not show the same pattern at all. Meanwhile, the Scottish Wildcat—a close wild relative of domestic cats—only showed these unusual fats occasionally.
This suggests that the buildup of these special lipids may be particularly common in domestic cats.
According to the researchers, the presence of these unusual fats could be an early sign that kidney cells are under long-term stress. Over time, this stress might contribute to damage in kidney tissues, potentially increasing the risk of chronic kidney disease.
Chronic kidney disease gradually reduces the kidneys’ ability to filter waste from the blood. In cats, it is especially common in older animals and can lead to symptoms such as weight loss, increased thirst, and reduced appetite.
The new findings suggest that feline biology may include metabolic features that make cats more vulnerable to this disease.
Scientists are still trying to understand why these fats accumulate in the first place. One possibility is that cats process certain nutrients differently from other animals due to their unique metabolism.
If researchers can uncover the cause, it may open the door to new ways of protecting cats’ kidney health. For example, special diets or supplements could potentially reduce the buildup of these unusual fats.
Although more research is needed, the discovery highlights a new area of investigation in feline biology. Understanding how these rare fats affect kidney cells could eventually help veterinarians detect kidney problems earlier, improve dietary recommendations, and develop new strategies to help cats live longer, healthier lives.
Source: KSR.
