Yoghurt is one of the most ancient nutriments that people are aware of and it was the basic nurture in the southern-eastern Europe, the middle-east and the upper-east for thousands of years.
There are a lot of references on yoghurt from the written documents of the ancient pharaohs. The Greeks knew about yoghurt and they were informed about its healthy qualities. The historian Herodotus refers to yoghurt on the 5th century BC, as does the great doctor Galenus (2nd century AD) who praises its soothing and laxative effect on the intestines.

* It allays from the irritable bowel syndrome (IBS), the pain in the bowels, the gas, the diarrhea or the constipation repairing the natural gut flora.
* It is a well known piece of advice by the doctors to consume yoghurt when taking antibiotics. Antibiotics harm the natural gut flora. Yoghurt supplies the gut with living micro-organisms which preserve its balance and compensate the harm caused in its flora.

The fat of the yoghurt is basically its skin. The fat is in the milk as small globules surrounded by proteins. Because of the fact that the specific gravity of the milk differs from the specific gravity of all its other nutrients (they are heavier) then, when the milk remains calm, its fat moves to its surface and it can be taken off (natural skimming).
In reality, when you take off the skin, the fat is very low in the yoghurt.