Methionine restriction extends yeast lifespan by reducing S-adenosylmethionine (SAM) production, which prevents methylation of protein phosphatase 2A (PP2A). This unmethylated PP2A stops dephosphorylating Npr2 at serine 362, activating non-nitrogen-starvation autophagy through the SEACIT complex. Remarkably, methionine restriction only during early aging phases was sufficient to trigger prolonged autophagy and lifespan extension. This finding illuminates a precise molecular pathway linking dietary methionine to cellular aging through epigenetic methylation control. The discovery is particularly significant because it identifies specific protein targets—PP2A, Npr2, and the SEACIT complex—that could potentially be modulated pharmacologically to achieve longevity benefits without requiring lifelong dietary restriction. While yeast studies don't directly translate to humans, this methylation-autophagy axis represents a fundamental cellular mechanism conserved across species. The work suggests that brief interventions targeting methionine metabolism or PP2A methylation might produce lasting anti-aging effects, offering a more practical approach than sustained dietary restriction. However, the complex interplay between methionine, methylation, and human physiology requires careful investigation before therapeutic applications.