Pick ranch, Caesar, or French and you could be converting your initially healthy entrée into something that's no better for your body than a fast-food meal. Also, don't assume low-fat or no-fat dressings are that much better for you—sugar and sodium are often added to make up for the flavor that's lost when calories or fat are scaled back.
The best way to dress your salad: Do it yourself. Stick to things like balsamic vinegar, olive oil, lemon juice, mashed avocado, or apple cider vinegar—the olive oil and avocado are especially important to include because they're rich in monounsaturated fats. Research published in the journal Molecular Nutrition & Food Research found that dressings rich in monounsaturated fats help your body to better absorb the nutrients in vegetables.