Spaghetti squash contains about 4 grams of sugar per serving (1 cup). It's middle of the road when it comes to starchy vegetables. There are other very low vegetables and starch squash, like zucchini and leafy greens, but it's not as starchy as other veggies like potatoes and carrots. Spaghettis squash contains a fair amount of fiber, which lowers its overall net carbs.