i've seriously considered this. i live with no one who would intervene. compared to finding drugs or executing (lol) the perfect method to CTB without messing up, starving to death seems easy in the inaction of it. though i have fasted with nothing but coffee and water for 11 days before and been completely fine. to starve to death would likely take upwards of two months... the pain, the boredom of being able to do nothing as even your mind cannot function a thought, the humiliation of your body malfunctioning and shutting down in embarassing ways... the inescapable cold...
it isn't worth it. there are faster and more dignified methods. your final days on this earth shouldn't be spent suffering, even the barbarism of death row still allows inmates the pleasure of a final meal. i understand having a disordered mind that finds appeal and maybe a strange romanticism in dying in such a way though.