the secret to a long healthy life is to consume as little food as possible

From the book written by John Grisham "THE GUARDIANS"
 
   "Years ago he told me that the secret to a long healthy life is to consume as little food as possible. Exercise is important but cannot reverse the damaging effects of too many calories. I have tried to follow his advice.
 
   (HODDER paperback p.184)    "he" here is "I"`s doctor.