I was explaining this to my daughter in quite simplified terms the other day- we evolved to taste sugar and enjoy it because finding a sweet edible plant meant we had a source of energy to help us hunt that day. Pretty useful if you’re a hunter-gatherer.
So we seek out sugar. Now we can get it whenever we want it, in much more massive quantities than we are supposed to be processing. Most of us are addicted. I’m not an exception.
After reading the other comments for a bit, it may depend on the tomatoes. The tomatoes I tend to use don’t need to balance out as much, I suppose
The tomatoes used for sauce often time have a higher acid content so you want a little sugar.
Some tomatoes, especially older heirloom varieties have more sugar than modern varieties and actually will make candy sauce if you’re not careful.
I spent the summer growing Cherokee purple just to make spaghetti sauce and it was like fucking dessert, no sugar added.
![This is how much sugar you are [possibly] eating.(lemmy.world)](https://lemmy.world/pictrs/image/9694cd80-f133-4b02-80e3-1e937a78ea83.png){kind=link}