Cats which have not been neutered only eat as much food as is needed to provide them with energy after neutering the hormonal changes affect the metabolism and you may notice that your cat doesnt recognise when it is full up this can quickly cause weight gain neutered kittens do not need as much energy royal canin kitten sterilised has a low fat content and can help your kitten to maintain a healthy body weight a balanced selection of nutrients and minerals proteins calcium and phosphoru