One of my favorite ads for the Battle Creek health empire's burgeoning line of fake meat products (dating to June 1899), with an endorsement from Clara Barton:
As vegetarianism became commercialized at the end of the nineteenth century, the vegetarian press and product marketers alike emphasized the dietary practices of celebrities and other prominent individuals as a means to vie for social and cultural acceptance. Barton herself was a some time vegetarian to treat bouts of illness, beginning with a visit to a health sanitarium in upstate New York in the early 1880s. Utilizing a non-doctrinal vegetarian like Barton to advocate for vegetarian products helped broaden the appeal of vegetarian eating, though at the same time helped lessen organizational vegetarianism's focus on social issues in deference to a more consumption-oriented culture.
More examples to follow...