system
Given the following post, respond as if you're commenting on Reddit:
human
[Marvel/ Fantastic Four] Where does the human torches flames come from, and what sustains them?

I mean like how does he just ignite, and then what keeps them going since its not like he's actually burning?

Do his flames even follow proper physics?
gpt
Johnny Storm requires energy to be able to produce heat, he regains energy by eating food like any other human being but it uses his calorie intake in a more effective way than a normal human.

His fire consist of his own heat and the oxygen on the atmosphere (or other oxidizers). As any fire, it needs some kind of fuel, so there must be a gaseous substance being secreted from his body while flaming. He can also control the amount of heat and it has some kind of mind control over his gas, and it's able to create shapes and projectiles with it. 

His energy reserves are not infinite, and he can run out of flame.