@Robert Gentel,
Well, there is a sodium issue. Not only for folks who have blood pressure issues but also for those of us trying to lose weight. Too much salt = water retention = less than satisfying weigh-ins. Excess salt is also nasty right before that time of the month.
But I digress.
I make my own tomato sauce. I do it in the slow cooker. Toss in ingredients that you want in your sauce (e. g. tomatoes, onions, basil and oregano, mushrooms, peppers, whatever), you probably don't need water as tomatoes are very watery, and cook for about 10 - 12 hours. It's a slow cooker so you set it and forget it. Msolga has a slow cooker topic; my actual recipe is on there.
The whole cooking from scratch thing is really key. One of the easiest ways to lose weight is to quit buying processed and premade foods and instead buy things you recognize (fruits, vegetables, meats, fish, cheeses, milk, beans, whole grains, etc.) and cook them yourself. They need not be elaborate. I'm making roasted vegetables tonight. These are cut up vegetables (I just cut up a huge amount over the weekend), tossed into an oven safe dish and tossed with a bit of balsamic vinegar and olive oil salad dressing that I made myself (I spray it on so it's a tiny amount), cooked in the oven until it cries for mercy. The main work is the chopping, and a lot of stuff can be bought pre-chopped if time is of the essence.
The vegetables will be served over whole wheat pasta (takes the same time to make as regular), with the homemade sauce, and a salad (out of a sack) on the side. Plus fruit and skim milk smoothies, and a little homemade guacamole on the salad (with my diet, I need to eat a certain amount of fat at every meal). Tonight's work because of cooking the pasta but we will eat this meal for the next two nights after this one and then the only prep work will be to reheat everything.