Lions are carnivorous animals who generally feed on herbivorous animals. You might wonder that how does it stays healthy just by feeding on the meat. The answer is lions have a very good diet. The nutrition of the plants is indirectly consumed by them when they eat the stomach and intestines of the hunted prey. The intestines contain some amount of nutrition from the undigested food. And as a bonus fact – the lions are very smart, and so when they are unable to find and hunt down a prey, they sometimes enjoy the grass as well.