Fat-Free Salad Dressings “When we grab for the fat-free bottle, we think we are making a good choice,” says Lisa Hayim, registered dietitian and founder of The Well Necessities. Not the case. “These fat-free salads dressings can be loaded with salt and sugar to give them flavor. We end up pouring on more, making sure each piece of lettuce in our salad is doused. After the salad is over, the salt and sugar make you feel unsatisfied and craving more.