You may feel a trace of guilt about putting dressing on your salad. Or are you in the habit of ordering it on the side, so you’ll use less? It’s officially time to let go of all that. A study released last week by Iowa State University shows that the typical oil in dressing significantly boosts the nutrition you take in from veggies like carrots, tomatoes and leafy greens. And the more you pour on, the more benefit you’ll receive. The study’s lead author, Wendy White, describes it as “that rare, perfectly linear relationship” where doubling the dressing doubles the absorption of eight different nutrients, including cancer-fighting carotenoids and vitamins K, E and A.