Keep in mind you generally don't want protein-eating (flesh-eating) bacteria (your intestines are made of protein FYI). The good bacteria eat fiber and produce a range of health-promoting vitamins in your gut for free. The protein-eating bacteria give you IBS. If you eat plenty of fiber, and aren't eating 100% meat meals that bacteria would find indistinguishable from your intestinal flesh (e.g. bacon and eggs with nothing else) that toxic gut culture will not develop. Fats don't have any fiber in their diets and that is why their gut culture sucks.  I notice with people on low-carb diets, who tend to eat in as junky a fashion as possible, going nuts with the butter and bacon. It isn't surpising that they look unhealthy and explode the minute they're off the diet. You want to eat a pound of bacon, you better have a huge salad with that or you will pay later!