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Cats may boost happiness but could harm mental health, say researchers

Global Study Links Cat Populations to Higher National Happiness and Lower Parasite Exposure Public data from 93 countries published in PLOS One reveals that nations with higher cat populations tend to report greater levels of national happiness. At…

Cats may boost happiness but could harm mental health, say researchers

Global Study Links Cat Populations to Higher National Happiness and Lower Parasite Exposure

Public data from 93 countries published in PLOS One reveals that nations with higher cat populations tend to report greater levels of national happiness. At the same time, the same international study shows that areas heavily exposed to the parasite Toxoplasma gondii report lower levels of well-being.

The Biopsychosocial Paradox of Feline Ownership

Researchers identified what they describe as a fascinating biopsychological paradox. While cats deliver psychological and emotional benefits to their owners, they can also carry pathogens that can have harmful consequences for mental health. Interestingly, territories with larger feline populations actually showed lower levels of toxoplasmosis exposure overall. This illness spreads not only through felines, but also via contaminated food, fruits and vegetables soiled by contaminated feces, or contact with contaminated soil.

Conflicting Data on Psychological Well-Being

While domestic cats provide companionship, large-scale psychological data presents a more complex picture. Research led by psychologist Catherine Amiot at UQAM and published in 2022 in Scientific Reports surveyed nearly 2,500 Canadians during the pandemic. That specific study revealed that pet owners on average sometimes reported lower psychological well-being on certain indicators compared to non-owners.

Cats may boost happiness but could harm mental health, say researchers
Photo: Top Santé

National wealth influences parasite exposure

National wealth influences how pet care affects public health outcomes. In wealthier nations, cats are more likely to live indoors, benefit from regular veterinary visits, and receive a diet adapted to their needs. Biologist Javier I. Borráz-León explains that these socio-economic conditions prevent the simple assumption that more cats necessarily mean greater parasite exposure. Future research must utilize longitudinal and interdisciplinary approaches to track individual pet owners rather than relying solely on nationwide aggregates.

What specific parasite is linked to cat populations?

What specific parasite is linked to cat populations in the PLOS One study?

The study examines Toxoplasma gondii, a parasite that can reproduce in the intestines of felines and is eliminated through their feces.

Research: Countries With More Cats Have Higher Happiness Levels | GRAVITAS

How does toxoplasmosis typically spread if not solely through cats?

Infection occurs through the ingestion of contaminated food, the consumption of fruits and vegetables soiled by contaminated feces, or contact with contaminated soil.

What did the 2021 Japanese study reveal about living with a cat?

The research involving 32 cat owners measured hormones, emotions and heart rates at home, confirming that biological effects were present depending on the nature of the interaction.

What percentage of patients reported that pets improved their sleep at the Mayo Clinic?

Approximately 41 percent of surveyed patients stated that having an animal in the bedroom improved or did not disturb their night, while 20 percent found it disruptive.

About the author: Dr Natalie Singh - Health Editor

Board‑certified internal‑medicine physician and MPH. Natalie authored peer‑reviewed studies on infectious disease and served as medical editor. “Dr. Natalie Singh delivers evidence‑based health news, medical breakthroughs, and expert wellness guidance.”