Why do they say starvation doesn’t help someone lose weight?

if it worked for them, then you can try it, but i would be extremely careful... the reason why they say starving yourself doesnt work is because your body starts to eat away at your fat to keep your body running, that all works but when you start to eat normal or even healthy your body still thinks its in starvation mode and stores anything and everything as fat instead of digesting it like normal. I wouldn't advise dropping that low in calories, I say a 1000 would still get you results without making your body go haywire