People look for a special magic bullet when it comes to weight loss or healthy living.
There is no single simple solution of course. Even my mantra, "Everything in moderation," is incomplete. Education is key. The more we understand about an issue, the better we can devise solutions.
Much of the healthy living and weight loss discussion has to do with the relative balance of intestinal flora, or the bacteria found in our gut. If the balance is altered, weight gain, or intestinal symptoms such as bloating, diarrhea or worse, may ensue.
Probiotics and fermented foods don't work in isolation. There is much more to rebalancing gut bacteria. For more read this excellent essay published by Johns Hopkins Medicine.