I am a firm believer that different diets work for different people. You need to figure out what works best for you! Some people do well with a day of vacation, some people can eat unhealthy in moderation, while others need abstinence from anything unhealthy.
It seems like you are from the abstinence crowd. Anything not dietetic is trief! Use w/w challah. Buy the small bilkelach (or matzah).
Fill up on fish and soup. I like chickpeas in my soup along with lots of veggies.
Shabbos day you can have a bean and chicken cholent; and enjoy your salads!
Desserts are for people who can tolerate moderation; I’m not one of them! Only fresh fruit (& Tums!)