Dr. Kellogg invented Kellogg's Corn Flakes because he hoped that they would reduce what activity in people?

He hoped the corn flakes would reduce the eating of meat and therefore have people adhere to a vegetarian diet.

https://en.wikipedia.org/wiki/Corn_flakes

Libido, or sex drive: "The accidental legacy of corn flakes goes back to the late 19th century, when a team of Seventh-day Adventists began to develop new food to adhere to the vegetarian diet recommended by the church. Members of the group experimented with a number of different grains, including wheat, oats, rice, barley, and corn. In 1894, Dr. John Harvey Kellogg, the superintendent of The Battle Creek Sanitarium in Michigan and an Adventist, used these recipes as part of a strict vegetarian regimen for his patients, which also included no alcohol, tobacco, or caffeine. The diet he imposed consisted entirely of bland foods. A follower of Sylvester Graham, the inventor of graham crackers and graham bread and supporter of sexual abstinence, Kellogg believed that spicy or sweet foods would increase passions. In contrast, cornflakes would have an anaphrodisiac property and lower the sex drive."
http://forums.upnetwork.net/showthread.php?t=3028

As a Seventh-Day Adventist, Dr. Kellogg unquestionably advocated a vegetarian diet, but that wasn't the primary benefit that he was hoping for from corn flakes. The spin that he was motivated by trying to eliminate meat was promulgated by the Kellogg Corp. after Dr. Kellogg's brother W.K. Kellogg became the majority owner. to distance corn flakes from Dr. Kellogg's disproven medical theories.

psychcentral.com/lib/2007/do-kelloggs-corn-flakes
stayfreemagazine.org/10/graham.htm
[these no longer exist]