No doubt. He even seemed to think that married sex was immoral in some way. He was very proud of the fact that he never had sex with his wife. From the same article:
However, while Kellogg became the preeminent leader in nutrition and health reform during the late 19th century, his proudest and most cherished accomplishment was never having sex with his wife. Though he received
daily enemas from a handsome male nurse, he was so adamant that sex of any kind was a vex to physical, emotional and spiritual health that he slept in a separate room from his wife and fostered 42 children to avoid having to consummate his marriage.
Have you ever wondered who invented cheese? Or big, crusty bread? Seriously: How did anyone know to combine ground-up grains with water and yeast and...
melmagazine.com
A lot of the claims in that article are not hearsay. They are taken from a book that Kellogg wrote called "
Plain Facts for the Old and Young"
That link goes to the book itself.