 Green patrolled Oxford Street in the West End for 25 years , from 1968 until 1993 , with a placard recommending " protein wisdom " , a low @-@ protein diet that he said would <unk> the <unk> and make people <unk> . His 14 @-@ page pamphlet , Eight Passion Proteins with Care , sold 87 @,@ 000 copies over 20 years . 
