Conversation so far:
Did John Harvey Kellogg support drinking alcohol?
Alcoholic beverages were commonly used by the medical community during the time that John Kellogg began his medical practice. He was firm in his opposition to the practice.
Why was John Harvey Kellogg against alcohol?
John Kellogg believed that alcohol could not be a stimulant because it lessened vital activity and depressed vital forces. Kellogg also considered it to lead to mental and moral bankruptcy.
What other beverages was John Harvey Kellogg against?
John Kellogg also opposed tea and coffee due to the caffeine content of those beverages.
How did John Harvey Kellogg feel about coffee and tea?
John Kellogg's view was that caffeine was a poison.
What did John Harvey Kellogg feel was bad about using caffeine?
Not only did John Kellogg detail numerous physiological and developmental problems caused by caffeine, but he also suggested that caffeine usage could lead to moral deficiencies.
What was the popular view of alcohol during John Harvey Kellogg's time?
John Kellogg went against the prevailing notion of the time that 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 of alcohol?