Seems this is what was tried:

The twins underwent behavioural analysis, speech therapy and a strict gluten-free diet and nutrition programme as part of the trial to reduce inflammation.

The diet was casein-free, a protein found in milk; low-sugar; had no artificial colours or dyes; zero ultra-processed foods; primarily organic; and locally sourced.

The girls were also given daily supplements for omega-3 fatty acids, multivitamins, vitamin D, carnitine, and others.