Before travelling, why Curd eating is considered auspicious in Hindu families ?

In most of Bollywood movies, you must have seen that Indian mother use to feed yogurt to his son before leaving home for college, school or job. And says "Ghar se nikalte samay dahi khana subh hota hai". It is accepted as a ritual and tradition in Hindu families. Also, it has a big scientific reason to eat yogurt before leaving home. As we all know that Yogurt is good for health and digestion. It contain Lacto bacillus backetria which is a probiotic bacteria. In ancient India, people were aware that yogurt is good for health and protect stomach and intestine from food poisoning bacteria. Generally, in ancinet time of India, people used to travel long distance journey. During this long journey, people use to eat different of contaminated food and water. So, they were knowing that consuming of yogurt protect stomach and intestinal lining for long duration of time. Hence, it become a tradition and ritual to feed yogurt before leaving home. Almost, in mythological books of Hindu, It is appraised for the usefullness of Yogurt. In Hindu, ritual panchamarit is used to serve to deities and later, it distributed to people with spoon. As the name suggested "Panchaamrit" mean five Elixers. Yogurt is also a kind of Elixer among other fours. Regular consuming of Yogurt gives long life and good digestion power. Consuming of yogurt before leaving home, people consider it as as blind faith. There is nothing like blind faith untill it is evaluated based on science and rational thought. According to me and my point of view, there is nothing like blind faith. Everything in Hinduism has some rational and scientific ground.

Jai Shri Krishna🙏