Kelly Preston is speaking out about her late son, Jett Travolta, almost four years after his death.
The actress appeared as a guest on "The Doctors" to discuss the health conditions that led to the 16-year-old's death in 2009.
"[Jett] was autistic. He had seizures and when he was very young, he had Kawasaki Syndrome," she said in the episode, airing Wednesday, according to People.
She added, "I strongly believe as a mother, as does my husband, that there are certain contributing factors that lead to autism and some of it is very much the chemicals in our environment and in our food."
Preston, 50, said on "The Doctors" that she believes a number of things are responsible for Jett's autism, People reports. Specifically, she mentioned Kawasaki Syndrome, her "hard and fast" labor and the use of antibiotics while breastfeeding, which she said gave Jett thrush, an infection of Candida yeast, which some studies have linked to the symptoms of autism.
She also went on to advocate an organic lifestyle during the "Doctors" episode, which took a look inside Alternative Laboratories to show how organic products are made.
Jett Travolta died in January 2009 after suffering a seizure at the family's vacation home in the Bahamas. Preston and husband John Travolta also are parents to daughter Ella Bleu, 12, and 2-year-old son Benjamin.
Watch a preview for Preston's appearance below: