Royal Canin Indoor Cat Light 40 food is formulated for indoor cats prone to obesity from 1-10 years of age. Some cats have a greater tendency to gain weight than others. Plus, indoor cats lead a more sedentary lifestyle and may need a formula focused on controlling their weight. This formula is the ideal balance between a diet's energy level (measured in calories) and the energy expenditure, in relation to your cat's lifestyle and activity level, supports a healthy weight. Formulated with natural flavors to help provide your overweight cat with an appealing, low calorie diet. Also this high protein diet with moderate fat levels (high ration of proteins to calories) may help to prevent excess weight gain and preserve your cat's elegant body line.