3,4-Dihydroxyphenylalanine

Better known as L-DOPA, this amino acid derivative occurs naturally in faba beans and a few underused legumes, where it is classed among the amino-acid antinutrients. Outside food science it is famous as the direct precursor of dopamine and the mainstay drug for Parkinson’s disease. In the food context, faba beans deserve respect for a different reason: they can trigger favism, a sudden destruction of red blood cells, in people with G6PD deficiency — a reaction tied to other bean compounds rather than to L-DOPA itself. Proper processing and awareness of susceptible populations remain the practical safeguards.