Here is our island. The inhabitants are beneficial microorganisms, in other words bacteria.
Their consumption is useful for the restoration of microflora in the digestive tract.
When yogurt is permitted to drain, the bacteria gets dragged out of the solid like logs in rivers.
So if we want to see bacteria, we need to look at the shores of the island.
And if you want the health benefits of those bacteria, you should not throw away the water of yogurt.