I have end stage renal failure due to sugar issues. Sugar is indeed one of the worst foods you can take into your body. There are so many other good flavors to eat, that added sugar and syrups don't need to be a part of the diet. As was stated, if your tomato sauce, for pizza, or pasta is too acidic (acids have a sour taste, think vinegar or lemon), add a bit of baking soda to neutralize the acid. It doesn't take very much, just a pinch.
I like to use crushed tomato, tomato puree, whole canned tomatoes, or diced tomato as they have nothing in the can except tomato and a little salt. This allows me a clean slate, so to speak, on which I cab build my flavors. Myy favorite brand is DeFratelli.
A little sugar isn't going to hurt you. But have pasta, bread, baked goods made with flour, rolled oats, or any grain, and you are ingesting sugars, or starches, which are quickly converted to sugar by the body. This means doughnuts, cakes, pies, and virtually all parties are a double whammy. You get the starches from the flour, pluss the added sugars used to make fillings, glazes, and whatever else goes into that cookie, pie, or pastry. Eat sweets and starchy foods sparingly. Just be aware of what you are eating. Fresh fruits and veggies, and meats should be the bulk of your diet. Fruits and berries that are native to the US, and apples, are great fruits that are high in nutrients, and fiber, and moderately low in fructose (fruit sugar).
As an experiment, cut the kernals off of an ear of sweet corn, and compare the amout with what is in a standard can of corn. You will find that one ear of corn has a lot of corn on it. And corn has lots of natural sugar, and starches, compared to the nutrition it provides. It tastes great, but isn't so good for you. Root veggies ae also high in sugar and starches S be careful of what you eat, Believe me, renal failure is no joke. Diabetes is no joke. Too much sugar will put you there. Mountain Dew causes dental carries (cavities) more than any other soda. So watch what you drink as well.
Seeeeeeya; Chief Longwind of the North