Weight loss can result in a loss of muscle mass if there is a reduced protein level in a cat's food. It is essential to provide an optimal level of high quality protein in a light formula to support lean muscle mass during weight loss. ULTRA LIGHT thin slices in gravy has reduced calories (17% less calories than Adult Instinctive) for overweight cats from 1 to 7 years of age. Instinctively preferred by adult cats, ULTRA LIGHT provides 100% complete and balanced nutrition while promoting urinary tract health.