Final answer:
Caffeine increases fatty acid mobilization by increasing the formation of cyclic AMP (cAMP), which activates protein kinase A (PKA) and phosphorylates enzymes involved in mobilizing fatty acids.
Step-by-step explanation:
Caffeine can increase fatty acid mobilization by increasing the formation of cyclic AMP (cAMP). When caffeine binds to the ß-adrenergic receptors in muscle cells, it triggers the activation of adenylyl cyclase, which converts ATP to cAMP. The cAMP then activates protein kinase A (PKA), which phosphorylates enzymes involved in fatty acid mobilization, leading to its increase.