I have joked the five major food groups are sugar, salt, fat, alcohol, and caffeine. Unfortunately, for us, our taste buds like the first three, and they can be used to generate fairly tasty food types cheaply. Many of us also like the last two.
Avoiding anything with "added sugar" is indeed a good strategy, but it's not easy of course. I think if one avoids at least aisles containing breakfast cereals and salted snacks, you are going fairly well.
Some wines have added sugar in the vinification process, called Chaptalization. This is fairly common in regions where grapes often don't reach desired sugar content before harvesting (brix). Champagne is one example.
I like the concept of avoiding the middle aisles in a grocery store, obviously dried beans would be fine. I stopped eating dessert with few exceptions years back after reading about fructose.