This also requires overriding millions of years of evolution and multiple levels of body systems all screaming "you're hungry, EAT EAT EAT". You can kick a her

This also requires overriding millions of years of evolution and multiple levels of body systems all screaming "you're hungry, EAT EAT EAT". You can kick a heroine habit by quitting. You can never stop eating. How successful do you imagine most junkies would be if the standard advice was "measure the amount of heroine you take per day and stay below your target".