those 3 links are effectively from a single source, Dr Natasha Campbell-McBride, who hasn't practiced as an MD for what looks like 20 years. She makes a living out of that miracle diet. She's anti-vax and hasn't published any research about GAPS.

I think her whole scheme is dangerous and would recommend everyone who's considering this diet to look at the negative press around the diet and its proponent. You'll have to look pretty deep into google results to find those, but they're there. I'm not linking them because I'm not qualified to judge their quality besides superficially.