An Aboriginal health organisation says soft drinks and fast foods may soon be illegal in the Pitjantjatjara lands in central Australia.

In a move to end chronic illness and death caused by poor nutrition, 10 Pitjantjatjara communities have endorsed a policy to strictly control foods sold in their stores.

Nganampa health officer Stephie Rainow says it plans to enact the stores policy as a by-law which will legally bind store managers.

"At the end of the day if they've endorsed the policy and the policy says this is what will occur, there will be for instance in the store managers' contracts and in their duty statements, conditions set out under which they operate," he said.

"So if the policy says there'll be no stocking of Coca-Cola, then well there'll be no stocking of Coca-Cola."