The uncertain food supply means they regularly go through cycles of too much and too little food (it also meansthat they are often restricted to eating less than they could manage if food were omnipresent).
Experts say that by this process, this meansthat no new bombs of plutonium are being made, no better bombs, and it makes itmuchless likely that North Korea is able to export its knowledge, its expertise or any material that could be used for nuclear weapons.