Warbler said:

If a person goes without food for long enough, he/she will die. That is a fact.

LOL, not saying someone can go indefinitely without food. Not sure what is being debated here, if anything at all. Yeah, of course they'll die if they go long enough without it, but forty days isn't always it (at least not in every case). The amount of time someone can go without food depends on the person and their body weight (my friend who did this forty day thing once a year was a big guy) and other health conditions and factors.