Why is it that other people dont what to eat pork?

Hi God reveals which animals including fish and birds are suitable and unsuitable for human sonsumption in leviticus 11 and deuteronomy 14. Although the lists arnt exhaustive, He reveals guidelines for recognizing animals that are acceptable for food. God states that cud-chewing animals with split hooves can be eaten. (leviticus 11:3 and deuteronomy 14:6) These specifically incluede the cattle, sheep, goat, deer, and gazelle he also lists such animals as camels, rabbits, and pigs are unclean or unfit to eat(leviticus 11:4-8) He later listst such creeping animals, as moles, mice and lizards are unfit (leviticus 29-31) As well as four-footed animals with paws(cats, dogs, bears, lions, tigers ect. as unclean He tells us that salt and freshwater fish with fins and scales may be eaten (verses 9-12) but water creatures without those characteriscits (catfish, lobsters, oysters, shrimp, craps, clams, mussels, squid, frogs, octopi, etc) should not be eaten God also lists birds and other flying creatures that are unclean leviticus 11:20-23 God didnt give lawas to arbitrarily assert contorl over humans. He gave His laws "that it might be well with those who seek to obey him (deuteronomy 5:29) Hope this helps you. I am glad that your brother has taken the step in the right direction!