Not if you use good canned tomatoes. A good tomato sauce requires naturally sweet tomatoes, so go for the best-canned whole and strained tomatoes you can find. Brands like Pomi, Jovial, and Bionaturae never have let me down. Their tomatoes are sweet and sourced from sustainable farming in Italy! All are readily available at most grocery stores or online. Whatever your preference, choose canned tomatoes that are salt-free, sugar-free, and not diluted with water.