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In Search Of A Healthy Gut, One Man Turned To An Extreme DIY Fecal Transplant (theverge.com)
Josiah Zayner writes: Arielle Duhaime-Ross at The Verge followed Dr. Josiah Zayner, a former Scientist at NASA turned BioHacker, as he attempted the first ever full-body microbiome transplant. She writes "Over the course of the next four days, Zayner would attempt to eradicate the trillions of microbes that lived on and inside his body -- organisms that helped him digest food, produce vitamins and enzymes, and protected his body from other, more dangerous bacteria. Ruthlessly and methodically, he would try to render himself into a biological blank slate. Then, he would inoculate himself with a friend's microbes -- a procedure he refers to as a 'microbiome transplant.'".
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There are other ways to adjust the bacteria present, such as through diet.
That worked for me. A few years ago I bought a $39 yogurt maker from Amazon, and started eating a bowl fresh from the incubator every morning. As my gut bacteria changed, so did my appetite. I no longer craved sugar or other carbs, and started eating more fiber and veggies. I guess the little critters were using some sort of chemical feedback to make me eat a diet more to their liking. I am about 5 pounds lighter, have more energy, and have had no gut problems (diarrhea, constipation, or pain) in years.
No, the live cultures in yogurt are bacteria. Perhaps the confusion is in that yogurt production is referred to as fermentation, and we usually associate that word with the action of yeast in alcoholic beverages. But fermentation just means anaerobic metabolism, and it occurs in yeast, some species of bacteria, and even animals when muscles work faster than they can pull in oxygen from the blood. The byproduct of yeast fermentation is ethanol, and the byproduct of bacteria and muscle fermentation is lactic acid, which is what makes yogurt sour, and makes muscles ache after sprinting without a cool down.
You are probably right that the yogurt bacteria are not those usually found in the gut. But the presence of those bacteria may be beneficial in the gut flora due to being non harmful, while being competitive against other bacteria which are.