The EVO line of pet foods have been specially designed to provide all the key nutritional benefits received from the feeding of raw food diets but with the benefits of 21st Century nutritional research. EVO Reduced Fat (RF) dog food contains 30% less fat than regular EVO Dog Food but with 20% MORE protein. Recent studies have shown that high protein, low fat diets help to build lean body mass while still acheiving weight loss (weight loss occurs until an equalibrium of muscle to fat is reached).