evidence: Toxoplasmosis is caused by an infection with the parasite Toxoplasma gondii. This parasite is most commonly found in contaminated food (especially raw and undercooked meat), but it can also be found in cat feces. Most T. gondii infections in people with healthy immune systems are asymptomatic and resolve on their own within a few weeks or months. Ghrelin is a hormone produced by the stomach and often called the "hunger hormone". There is currently no evidence supporting an association between toxoplasmosis and increased ghrelin hormone levels. [...] A Facebook reel shared on 6 June 2024 claimed that a so-called "cat parasite" causes toxoplasmosis. It also claimed that toxoplasmosis leads to an increased release of the ghrelin hormone (commonly known as the "hunger hormone"), which in turn leads a host of other health issues including "depression, highs and lows, irregular heartbeat, muscle twitching, brittle hair, dry skin, psoriasis, [and] unregulated sleep cycles". [...] The "cat parasite" claim has received media attention in the past, primarily addressing the potential link between T. gondii, mental illness, and risk-taking behavior. However, there is no apparent evidence for an association between toxoplasmosis and an increase in the ghrelin hormone. We explain below.