Endogenous cannabinoids are made from specific dietary fats and regulate metabolism. Plant cannabinoids like THC are fat-soluble molecules and THC accumulates in adipose (fat) tissue. This suggests that the amount of body fat you have, and the rate at which you burn it off, could affect how quickly THC gets released from fats stores into the bloodstream.
https://www.leafly.com/news/science-tech/thc-fat-exercise-blood-levels
