Did York Test years ago. Gluten, dairy, eggs, cherries and almonds. Have also done low fodmap and funnily enough reacted to most of those on re-introduction phase (as well as many other things).
Egg aren’t a fodmap thing, but high sulphur foods are a trigger for Hydrogen Sulphide SIBO (Small Intestinal Bacterial Overgrowth- present in 60% of IBS cases). So years down the line, turns out eggs are a trigger too.
I’ve done so many elimination diets and diets designed/purported to help IBS- SCD, GAPs, Low Fodmap, Low Sulfur, SIBO-Specific, Bi-phasic SIBO, Paleo, Keto, Primal, Fast Tract. All have provided part of the picture for me but not all of it. And they all take months.
The York Test for me was a useful snapshot that helped me cut out the worst offenders (gluten and dairy) quickly.
I’m quite excited by the concept behind DNAnudge. It’s a genetic test devised by an Imperial College researcher (prompted by his young son’s experience of illness- he had a genetic condition that isn’t curable, but if he’d followed a suitable diet from birth he could have avoided kidney failure and transplant surgery). It tells you which foods are and aren’t suitable for you based on your DNA- it comes with an app and a bracelet that scans barcodes. I plan to take this test in the New Year. If I was starting out re diets I’d start there.