Yes, there is nothing new to probiotics. However, they are grossly lacking in the standard American diet while foods that promote bad bacteria are abundant. There is also a lot of new medical research showing the link between the gut biome and the host of medical abnormalities that we now take for granted including obesity, diabetes, heart disease, depression, dementia, compromised immunity, and so on. We exist in a symbiotic relationship with the trillions of bacteria that inhabit our body. If we take care of them and promote the health of the good ones then they in turn take care of us and we remain healthy.
The alternative is what we see as the norm among the vast majority of people today.
Cultured yogurt such as ->-bleeped-<-e is good. Any fermented food containing the live cultures are good. Prebiotics are those foods you eat that are favored by the bacteria you want to flourish. These include onions, garlic, leeks, coffee, and more that I am still discovering.
Processed sugar in the absurd volumes that most eat along with the genetically modified wheat that is our main staple promote unhealthy gut bacteria along with obesity and other internal abnormalities affecting not just the digestive system but every system in the body including the brain.
Conform and be dull. —James Frank Dobie, The Voice of the Coyote