I just want to echo what everybody else is trying to tell you...
STOP SMOKING TWEAK AND EAT SOME FUCKING FOOD.
In terms of actual 'need' for food it takes about 3 months of continual starvation for it to actually kill you...the longest i've been with no food at all is 2 weeks n i was in pretty bad shape...i'd say after about a month/month n a half u might start to digest yourself.
This is some HORRIBLE advice to give somebody who is acting out an anorexic disorder by starving themselves and tweaking. Methamphetamine speeds up the metabolism, to the extent where 2 days without food is getting extremely dangerous, even for the most overweight tweaker. Not to mention the lack of essential amino acids which are used to fuel the brain, and no vitamins... what the original poster is doing is a surefire recipe to lose some teeth, and some hair, and damage some organs... I would advise the original poster to not only stop tweaking and eat, but to have a friend drive them to the emergency room or at least a doctor, where a psychological and physical evaluation can be done. Take your blood pressure, take your pulse and temperature if you don't believe me that you are putting yourself in danger.
The body requires an intake of Phenylalanine or Tyrosine (amino acids present in all meat based proteins) to allow methamphetamine to remain euphoric, as methamphetamine just causes the RELEASE of dopamine the brain has already generated, it does NOT generate MORE dopamine, and your brain will not be able to create dopamine without any L-Dopa in your brain, which is manufactured from L-Tyrosine, which in turn comes from L-Phenylalanine.
If you want to lose weight, here's what I recommend, go buy some protein powder (the kind WITH vitamins is probably best for a tweaker, as vitamins alone hurt on an empty stomach) ... I recommend Dymatize Elite Chocolate for its taste... Now everytime you get hungry, drink a 16 oz glass of milk with a huge scoop of this protein powder in it... Be sure to have at least 2 scoops a day, and 1 real meal. Yes, I realise the original poster is probably too far gone to listen to this advice, but its here for anybody else who cares about their body and wants to lose some weight.