When you say ‘I can’t help myself’ you relinquish control to food or drink or whatever else you allow to control you. We allow ourselves to be controlled by whatever pleasures us – until it becomes an addiction.
Over-eating or under-eating are addictions of control. That being the case, you can control what is controlling you, because you let it control you.
Unlet it, or you control it. Those are the only two options of addiction survival.