There's a good chance that your gut microbiome forgot about meat which is why you have the problem. It's a well known story I've heard of vegetarians going bac

There's a good chance that your gut microbiome forgot about meat which is why you have the problem. It's a well known story I've heard of vegetarians going back to eating meat and then getting sick from the meat for some time. This is also why eating foods you're not used to can often make you sick even if they're fine. Your gut microbiome adapts to your diet, and if you suddenly change what you eat you can get indigestion. From my understanding the beyond/etc "meat" acts like real meat to your body microbiome because it's so similiar.