How does upbringing affect food habbit of an individual?

Your home environment at a young age "effects" everything you do in your adult life! Eating habits is just a classic example. That's why if you really love your children, you should set a good example during their learning years, as what they learn during those years, and will be ingrained into their physic in their adult life. If it is a bad habit it is very difficult to change.

Good luck, and God Bless