“a healthy kiddush”
You make a good point, and one which I’m a fan of. Still, the “bad” stuff is what makes a kiddush, and its also why the fatty heart-stoppers are served in small portions. Think the serving size of mashkeh. No one is saying its as healthy as milk or OJ, but no one’s saying you need 8-10 oz per day.
As far as the melaveh malkah menu, that’s why Sunday (spent outdoors, hopefully!) follows Shabbos. Its how you pay down the bill you ran up over the weekend.
Life is good… enjoy it!