Hi Badin,
Basically, removing all high protein molecule foods that these kids have a hard time digesting fully, like gluten, wheat, casein, whey, lactose, eggs, milk, soy. I have to really encourage you to also avoid all flours that are in regular stores and try to shop at the health food store for all your childs foods except meats, and fruits ( unless of course you can afford the organic meats and fruits as well). TOTALLY avoid preservatives, dyes ( especially red #40, and blue, yellow and orange, artificial flavors, and SUGAR++++ The sugar could be a chronic problem if used more than very sparingly, due the the intestinal yeast overgrowth. I suggest that you start a antifungal if your child has yeast overgrowth, and follow it with lactobacillus or a probiotic for children to replace the good bacteria in the intestine. You could give your child MCT oil. This is a medium chain triglyceride that is good for kids, especially if they need to gain weight. This MCT will kill the yeast by smothering it, if you choose to use a natural remidy. I also suggest that you put your child on a high potency vitamin, Super nu thera is great. My son has been on all these items and they all helped him incredibly. I can't say this enough but this is not a cure for all, but it is a bandaid that will help the child live a better quality of life, and for some children they may be totally cured as others may seem and look like they are cured but if, like in my sons case, they are reintroduced to a regular diet, the foods are like poison and they regress back into the autistic spectrum. My son is currently on the verge of losing his services because they think he is doping great, which he is , but he has set backs when he gets offending foods. I also encourage you to get the extra folic acid and vit B supplements, as well as DMG. These items made a huge difference in all areas of my sons life. This is a diet that has to become a way of life, and slacking off could be devastating. The foods are poison and if you can convince yourself to realize that when you see the negative effects they cause in your childs overall neuro- gastro, and immune system, you have to basically ask yourself is it worth poisoning them, because you may feel bad that the other kids got icecream or a piece of candy. Believe me it is not worht it. I never though I would gain my son from when I first noticed that somethimng was wrong. He never made eye contact, never smiled as a baby, never slept through the night with out waking up screaming, was in his own world, screamed when ever we put him at the table, when ever he had to make any changes, constant temper tantrums, biting,hitting, pintchingect. Overall the allergist dismissed him as being born miserable before we knew he had ASD. I just never gave up and in the midst of it I prayed. Having a child like this has taken a toll on my whole family due to the time consumption and unpredictability of behavior. However, after all thios intervention, I can honestly say THANK GOD, I started this so early, because you would never know he was FULL blown autistic for the first 2 years of his life. He still has episodes if he gets the offendoing foods but they are not a daily part of his life. Thjis diet takes a great deal of determination, and strength. Find as many food as possible that he might like. My son loves the rice crackers with almond butter. He has been on rice milk since about 15 months or so. We don't give him any juice or citric as this is also a big problem due to the lack of ability to digest properly. It is best to start the day with protein, and really focus on protein snacks as well. I wish you the best and hope this helps.