New Study Links Cat Density to National Happiness, But Parasite May Dampen Mood
Translated & summarized from Maariv by baba
A study of 93 countries found a positive correlation between the number of cats per capita and national happiness. However, higher exposure to the parasite Toxoplasma gondii, often carried by cats, was linked to lower happiness, suggesting a complex relationship.
The story in 5 lines · by baba
- Higher cat density correlates with higher national happiness scores.
- Parasite Toxoplasma gondii exposure linked to lower national happiness.
- Wealthier nations may have more indoor cats, reducing parasite exposure.
- Study is correlational, not proving cats directly cause happiness.
- Cat population and parasite data may not be fully representative.
A new international study, which included Israel among 93 surveyed countries, has uncovered a surprising correlation between the number of domestic cats per capita and national happiness levels. Researchers calculated the ratio of cats to every 10,000 residents and compared it with factors like happiness scores, GDP per capita, income levels, and health expenditures. The findings indicated a statistically significant positive correlation, with a correlation coefficient of 0.62, suggesting that countries with higher cat density tended to report higher happiness scores. However, this positive association was complicated by the presence of Toxoplasma gondii, a parasite for which cats are the definitive host. The study used antibody data from pregnant women to estimate exposure to the parasite. Countries with higher exposure to Toxoplasma gondii showed lower national happiness scores, particularly concerning recent infections indicated by IgM antibodies. When these factors were integrated into a statistical model, both cat density and recent Toxoplasma gondii exposure emerged as significant predictors of happiness, collectively explaining about 47% of the variance in national happiness scores. Interestingly, the study did not find a direct correlation between higher cat density and increased parasite exposure. One hypothesis suggests that in wealthier nations, cats are more likely to be kept indoors, fed processed food, and receive veterinary care, which may reduce parasite transmission. In contrast, cats in lower to middle-income countries might roam more freely, altering exposure patterns. The researchers caution against drawing definitive conclusions about cats directly causing happiness. They emphasize that this is an ecological and correlational study, not a causal one, and other factors like national wealth could be influencing both cat ownership and happiness. Furthermore, the data on cat populations and parasite exposure, particularly from pregnant women, may not fully represent the entire population. The study concludes that national happiness is likely influenced by a complex interplay of biological, environmental, and human-animal relationship factors, necessitating further long-term research to establish causality.