By the way, indigestion and feeling sick on a high protein /fat diet are possibly indicators of Hydrogen Sulfide Small Intestinal Bacterial Overgrowth (SIBO) which is often co-morbid with IMO (Intestinal methanogenic overgrowth). Dr Mark Pimentel has a lot of research on that.
Hydrogen Sulfide SIBO symptoms are diarrhoea, stomach pain, acid reflux, nausea, skin rashes, rapid weight loss, insomnia.
If you’ve ever been diagnosed with or suspected IBS, then this is an area to look into. Roughly speaking IBS-D maps onto Hydroden Sulfide SIBO, IBS-C maps onto IMO, and IBS-M maos into having both H2S SIBO and IMO.
People sometimes have both H2S SIBO and IMO and swing back and forth between the two depending on diet. High protein/high animal fat diets promote H2S producing bacteria and carbier/ higher fibre diets promote methanogenic archea.
Symptoms of IMO are often less acute than H2S SIBO. SIBO/IMO underlie about 70% of IBS.
For Hydrogen Sulfide SIBO, a good probiotic is L.Plantarum 299v. There’s a good study on it’s effectiveness in PI-IBS, so if you Google L.Plantarum 299v and PI-IBS you should find it. H2S SIBO underlies many cases of PI-IBS.