The carnivore way of eating helped with a lot of my symptoms. The way this works is similarly to the keto diet, but one would only eat products from animals. For example I can not handle grain and fiber and I only discovered that through the elimination phase of the diet : beef(fatty)+salt+water (+butter and cheese for me) for 6 weeks. I have no more IBS-C symptoms, no more pre-diabetes symptoms, and less to none of PCOS symptoms that include a more stable cycle, less amount of pain, easier period; I have hair re-growth, stable mood and no more anemia. I can only speak good about this way of eating, since it did wonders for me.
Resources currently available are found on:
r/zerocarb, r/carnivore, with scientific papers, studies and books within those subs, if anyone is curious.
I personally have read Dr. Shawn Baker's The Carnivore Diet and await Dr. P. Saladino's The Carnivore Code and K. Suzanne's The Carnivore Diet Handbook for more analysis on the subject, since this way of eating is new to science.
There's weekly interesting discussions on Youtube from Shawn Baker, Dr. Paul Saladino and this specific podcast Dr. Jason Fung with Dr. Shawn Baker where they discuss the benefits of this way of eating from multiple perspectives.