I'm sure other guys have said this, but there are severe problems with weight loss due to eating disorders:
Starvation causes metaolism to decrease since your body is trying to conserve energy. So when you finally do eat somehing, it automatically becomes stored as fat since the body uses fat as a back up reserve. And since you body doesn't know the next time it's ever going to get nourishment, anything you give it will be stored away just in case. That's why in poor, starving, poverty-stricken countries, people will be happy about fat children and babies because they think it means health when it's usually the other way around since the child is starving and the body is just upping the fat to try to keep it alive.
Only by eating regularly (to a degree, not necessarily on the clock) will your body handle and process food correctly.
On top of that, replacing three meals with six smaller meals spread out more frequently over the day will keep your metabolism up. In the time between breakfast, lunch, and dinner, the metabolism slows, because food isn't being digested and its nutrients distributed. So little burning of anything is happening. By eating smaller meals (equivalent calorie intake) over shorter periods of time in between, you keep your metabolism boosted.
Also, cut back on foods or food products or drinks that have 'high fructose corn syrup' in their ingrediants. High fructose corn syrup is in almost everything and while it's not terrible to eat a little, the fact that it's everywhere is a problem. It was asynthetic sugar that obviously isot natural to the digestive system. So when it IS ingested, it gets changed into fat. Many suggest that one of the contributors to wide-spread obesity is the inclusion of high fructose corn syrup in almost every food product consumed. But slowly, you can make steps to cut it out of yoru diet by picking other food products that don't have it. For example, a lot of the juice mixes out there have high fructose corn syrup like rasberry-cherry stuff by OceanSpray. But Juicy Jucie surprisingly is accurate when it says that it contians 100% fruit juice. No HFCS at all! So I buy that instead when I want fruit juices. Most apple juices and orange juices don't have it in there, either. So just check the labels when you go grocery shopping

Organics will usually never have stuff like that in them.
Finally, activity (excercise) also boost the metabolism (since now the body has a reason to distribute energy). So regular exercise (like three hours of cardiovascular work outs a week--sweating helps you know you're doing it right) will help out immensely. But, over-exercising will not promote muscle growth or very good health, since the body is so busy trying to sustain itself. So that's just as bad as purging or straving yourself.
The body needs a good amount of rest between exercise routines to function at its peak. trying to overdo that to excess will make you crash and everything will go haywire.
So try eating balanced, smaller meals over the course of your day, and every monday, Wednesday, and Friday, do about one hour of cardiovascular exercise.