US sauce and dip manufacturer Walden Farms has patented a process for preparing fat-free, calorie-free food dressings. The invention comes in response to a rise in demand for salad dressings that are as healthy as the salad they are dressing. Walden Farms stated that many consumers attempting to keep their weight down or maintain a good physique rely on salads, but many of dressings available are high in sugar or carbohydrate, so even fat-free dressings can be high in calories. This invention aims to address this imbalance.