Why do these obese mice eat so often?

Consuming linoleic acid, a type of fat found in certain oils, leads to the production of molecules that bind to CB1 receptors in the brain, which can lead to an increase in hunger.

In a specific strain of obese mice, overeating occurs because they eat more frequently, not because they eat larger meals or wait longer between meals. This suggests that the biological signals controlling hunger, not fullness, are altered.

Blocking the enzyme cyclooxygenase-2 decreases eating behavior in KK-Ay mice, suggesting that prostaglandins, along with endocannabinoids, play a role in driving excessive food intake in this genetically obese mouse strain.

In a specific strain of obese mice, higher levels of a fat-related molecule in the intestine correlate with more frequent eating, and blocking a specific receptor in the gut reduces food intake, suggesting this molecular pathway plays a role in overeating.

In mice with a genetic form of obesity, certain signaling molecules derived from arachidonic acid are found at higher concentrations in the intestines compared to lean mice, suggesting a change in how these fat-related compounds are processed in the gut.