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.
How did he feel about coffee and tea hot chocolate?
Kellogg also opposed tea and coffee due to the caffeine content.
What did he feel was bad about using caffeine?
His view was that caffeine was a poison.
What was the popular view of alcohol at the time?
alcohol was a stimulant.

Question: What research did he use to go against the popular view?
Self-contained rewrite: What research did John Harvey Kellogg use to go against the popular view?