The cereal, which contains neither grapes nor nuts, was
developed in 1897 by  C.W. Post, who was a patient
(and then a competitor), of Dr. John Harvey Kellogg.  

It was one of the first commercial products marketed as
health food.

     
Charles William Post (1854 – 1914)      John Harvey Kellogg   
                                                                         (1852 – 1943)