Thanks for posting the query.
No it is not a high fat food.The varieties include non-fat, low fat 2% and whole milk yoghurt 4%.
It is rich in nutrients which include protein, calcium, Riboflavin
,Vitamin B6 and B12.
is one of the bacteria used in preparation of this.
It is not naturally found in it.Lactose which is a milk protein is fermented by these bacteria which results in formation of yoghurt.
Hope I have answered your query.
Wishing you good health.