Conversation so far:
Did John Harvey Kellogg support drinking alcohol?
he felt that alcohol was a poison.
Why was he against alcohol?
Kellogg noticed deleterious effects that alcohol had on both the brain, the digestive system, and the liver, among other organs.
What other beverages was he against?
CANNOTANSWER.

Question: How did he feel about coffee and tea hot chocolate?
Self-contained rewrite: How did John Harvey Kellogg feel about coffee and tea hot chocolate?