Why aged cheese feels so different physically

That sharp, almost grainy, intensely savory sensation in old Parmesan is largely the FFAs at work:

The crystalline texture is actually a separate phenomenon — those are tyrosine and other amino acid crystals from protein breakdown (proteolysis running parallel to lipolysis). Two aging processes happening simultaneously, both contributing to that physical experience.

Tyrosine is the direct amino acid precursor to dopamine — the enzyme tyrosine hydroxylase converts it to L-DOPA, which is then converted to dopamine. That pathway itself doesn't require fatty acids directly. But the relationship you're sensing is real at a different level: the synthesis, storage, and release of dopamine all depend on cellular energy and membrane integrity that fatty acids govern.

Dopaminergic neurons are extraordinarily energy-hungry — the process of synthesizing dopamine, packaging it into vesicles, and firing it across a synapse is ATP-intensive, which ties it directly back to mitochondrial function and the same membrane potential we discussed for memory. The vesicles that store dopamine before release are themselves membrane structures, and their fluidity and function depend on the fatty acid composition of those membranes — exactly the omega-3 versus omega-6 story we covered for neurons generally. And tyrosine itself has to cross the blood-brain barrier via an amino acid transporter. The free fatty acids aren't dopamine's precursor. They're part of the foundation that makes dopaminergic signaling possible at all.