Carnivorous animals primarily consume animal matter. A good example of a carnivore is a cornsnake. If the pet you have chosen is a carnivore, it is up to you to develop a correct feeding regiment.
Many carnivorous pets end up obese with many health problems attributed to overeating.
So, be careful not to overfeed. Read as much literature as possible regarding the species that you want to own. Remember that if you want to convert your pet over to a non-live diet, it will need to be a slow transition. Insectivorous animals eat a diet consisting primarily of insects. The insects alone are not enough.