system
Given the following post, respond as if you're commenting on Reddit:
human
[One Punch Man] Does Saitama really have to eat to survive, because it's a habit even though he doesn't feel hunger pain, or because he likes the taste of convenience store food? If to survive, can he really be starved to death?
gpt
Saitama wanting food and other human comforts is what’s keeping him grounded, and preventing his becoming a monster. Saitama got his powers by going the monster route, and getting obsessed with a single aspect of power (the common thread of all the villains is obsession). 

What separates Saitama from the monsters is that Saitama loves his mundane human life. He likes eating food, cutting coupons, walking for groceries, playing video games, loafing around his apartment, etc. Without that grounding him, Saitama would be a top-tier monster threat.