Yes, yes yes!!

We're doing the GAPS diet and my son is making HUGE improvements! I 110% believe autism is curable and that my son will be free of autism within the next few years.

It takes a long time to start healing the gut and seeing improvements, it's not about food reactions per say (though autistic children do react to foods as they are unable to digest them fully) but it's about healing the gut so that takes time. You wont see improvements just by trying it short term. You also can't lump all the diets together and say sometimes diet works, because the diets are all different and I personally don't think any diet apart from GAPS really addresses all the areas needed for healing.

It is exhausting and I've found the past 7 months very hard, but I'm healing my son for life so it's flipping worth it! My son is a resistant eater so getting him on the diet was REALLY hard. I have force fed him fish oil and cod liver oil and he spat so much up we've ruined a lot of clothes, but he takes them easily now. It was worth the fight.

Read the book, best $30 you'll ever spend! There is a GAPS thread here you can look at.