How you solve clash of opinions in your family?

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For eg:you beleive in vegetarianisam and consider healh very important.your family eats meat ,fish etc .they eat junk foods ,colas or in other matters you beleive in certain principles in life ,but what will you do if your family members dont worry about these principles.how solve this?Will you compromise ?or will you go from your house or start a new life your own?what will happen even if you educate them about the ill effects of doing ill actis and they still continue it?