WASHINGTON (Reuters) – Health Secretary Robert F. Kennedy Jr. and FDA Commissioner Marty Makary said on Tuesday that the agency plans to remove petroleum-based synthetic food dyes from the U.S. food supply by revoking authorizations of some and working with industry to voluntarily remove others.

They cited concerns about a possible link between consumption of the dyes and health conditions like ADHD, obesity and diabetes, an area many scientists say requires more research.

It was not clear what studies Makary was referencing on the link between dyes and health problems. He held up a study he identified as being from the Lancet, a prestigious European medical journal. In 2007, a study in that journal found a link between food dyes and hyperactivity.

During a joint press conference that also included Kennedy’s Make America Healthy Again supporters and lawmakers in states that have food dye legislation, Kennedy and Makary raised a wide range of issues they want to address in the food supply.

Kennedy said the efforts to remove additives from food were necessary to address chronic disease in children and, without evidence, suggested it would address rising rates of conditions ranging from ADHD to food allergies.

Makary said the agency would begin the process of revoking authorization for two synthetic food colorings within the coming months and would work with industry to eliminate six other dyes by the end of next year.

FDA Plans to Authorize 4 Natural Color Additives

The Food and Drug Administration in a press release said it plans to authorize four new natural color additives in the coming weeks, while also accelerating the review and approval of others.

While Kennedy and other speakers asserted a strong link between synthetic food dyes and a wide range of health concerns, scientists say there is not yet a large enough body of evidence that food dyes cause any of those problems.

“The information out there is just so minuscule in the scheme of science that it’s really hard to make those generalizations,” said Emily Acri, a clinical transplant dietitian at Yale New Haven Hospital.

Makary said the transition from petroleum-based food dyes to natural ingredient dyes will not increase food prices. He suggested that food makers use ingredients like watermelon juice, beet juice and carrot juice to color their food.

It also plans to partner with the National Institutes of Health to research how food additives impact children’s health and development.

“For the last 50 years, we have been running one of the largest uncontrolled scientific experiments in the world on our nation’s children without their consent,” Makary said.

Removing the dyes from the food supply will not instantly make American children healthy, he said, but that it was an important step. Kennedy said the agency would soon target other additives.

U.S. food makers have said they will work with Kennedy and the Trump administration on regulatory changes such as nixing artificial food dyes used in products spanning from PepsiCo’s Doritos and Gatorade to General Mills’ Lucky Charms cereal.

The Consumer Brands Association, which represents the food industry, however, has pushed back on some of Kennedy’s rhetoric, saying in an April 7 memo that it is a misconception that the U.S. allows additives prohibited in Europe.

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(Reporting by Leah Douglas in Washington, Additional reporting by Renee Hickman and Julie Steenhuysen in Chicago; Writing by Michael Erman; Editing by Chris Reese and Bill Berkrot)