Luckily my sister does the cooking and she is pretty health conscious with her cooking considering she has actually taken general nutrition before.
When it comes to actual diseases or health problems in my family the only ones I know of is my mom had thyroid and gallbladder issues which I believe one might have been a result of her drinking too much diet coke but i'm not entirely sure. Other than my mother I don't believe anyone else in my immediate family have any health problems at all even my grandparents are doing well. So since the threat of genetic disease worsening my health are fairly slim I can worry about my own diet affecting me first. The only real cost of eating healthy though is just simply convenience to me because I already know taste is not an issue if you know what to properly eat isn't all abysmal. Personally I just find going on diet changes are tedious and that’s why don't prefer