DOVER-FOXCROFT, Maine — The documentary “Forks Over Knives” (PG, 90 min., 2011) will be screened, free to the public, on Sunday, May 20, at Center Theatre at 20 East Main St. It explores evidence that unprocessed food is the cornerstone of medicine and that whole-food, plant-based eating can halt or reverse heart disease, Type 2 diabetes and certain cancers.

After the film, which will be shown at 1:30 p.m., there will be 30 minutes during which Little Lads of Corinth, which is mentioned in the credits of the film, will provide free food. There also will be a 45-minute discussion by an orthopedic surgeon with ties to the film, Dr. John Herzog, who has a practice in Falmouth, and a 15-minute question-and-answer session with Dr. Herzog and Dr. Reuben Bell of Saco.

Doors open at 1 p.m. The public is welcome to drop in for any or all of the segments throughout the three-hour event.

“‘Forks Over Knives’ examines the profound claim that most, if not all, of the degenerative diseases that afflict us can be controlled, or even reversed, by rejecting our present menu of animal-based and processed foods,” according to the film’s website. “The major storyline in the film traces the personal journeys of a pair of pioneering yet under-appreciated researchers, Dr. T. Colin Campbell and Dr. Caldwell Esselstyn.

“The filmmakers travel with Drs. Campbell and Esselstyn on their separate but similar paths, from their childhood farms where they both produced ‘nature’s perfect food’; to China and Cleveland, where they explored ideas that challenged the established thinking and shook their own core beliefs,” the website says.

Also on hand at the event will be representatives of the Piscataquis Regional YMCA in Dover-Foxcroft and Friends of Community Fitness in Guilford, the Foxcroft Academy string quartet and floral artwork by Peggy Clark Lumpkins of Brownville.

Event sponsors include Mayo Regional Hospital, the Piscataquis Public Health Council, Dexter Internal Medicine, Charles A. Dean Memorial Hospital and The Eastern Gazette, with volunteer coordination by Sunbury Exchange.

For information, visit