This one's easy.
Mummia becomes accepted as a common form of folk medicine, and endures to the present day.
The fun thing as is hinted here in the quote above "medical" cannibalism was mainstream pretty much until the 20th century. And it didn't stop at mummies:
"Noble’s new book, Medicinal Cannibalism in Early Modern English Literature and Culture, and another by Richard Sugg of England’s University of Durham, Mummies, Cannibals and Vampires: The History of Corpse Medicine from the Renaissance to the Victorians, reveal that for several hundred years, peaking in the 16th and 17th centuries, many Europeans, including royalty, priests and scientists, routinely ingested remedies containing human bones, blood and fat as medicine for everything from headaches to epilepsy.
(...)
“The question was not, ‘Should you eat human flesh?’ but, ‘What sort of flesh should you eat?’ ” says Sugg. The answer, at first, was Egyptian mummy, which was crumbled into tinctures to stanch internal bleeding. But other parts of the body soon followed. Skull was one common ingredient, taken in powdered form to cure head ailments. Thomas Willis, a 17th-century pioneer of brain science, brewed a drink for apoplexy, or bleeding, that mingled powdered human skull and chocolate. And King Charles II of England sipped “The King’s Drops,” his personal tincture, containing human skull in alcohol."
(...)
"While that doesn’t seem to have been common practice, the poor, who couldn’t always afford the processed compounds sold in apothecaries, could gain the benefits of cannibal medicine by standing by at executions, paying a small amount for a cup of the still-warm blood of the condemned. The executioner was considered a big healer in Germanic countries."
(...)
However, consuming human remains fit with the leading medical theories of the day. “It emerged from homeopathic ideas,” says Noble. “It’s 'like cures like.' So you eat ground-up skull for pains in the head.” Or drink blood for diseases of the blood.
Especially the last observation shows a possible path to keep cannibalism relevant. Even in OTL people love they homeopathic quack medicine. Just have some of these weired theories prevail in the "alternative" medicine.
Source
http://www.smithsonianmag.com/histo...ses-as-medicine-82360284/#dYdlEMCHFZL8TTMk.99
SmithsonianMagazine