Simulating human metabolism usually requires slow, heavy differential equation solvers. As an independent researcher, I invented a new mathematical approach using Finite State Machines, Michaelis-Menten and Bateman kinetics to solve equations in sub-milliseconds with O(N log N) algorithmic complexity. Offered via lightning-fast REST API (135ms response time) and a web dashboard for digital health, developers, and nutrition research. 100% custom code, zero third-party, scientifically validated.