While seed mix is always popular with rodents, you will find that some nuts and seeds are more fattening than others. Your gerbil will gain weight quickly on a diet filled with sunflower seeds, for example. It’s better to offer pumpkin seeds and other lower fat options. Pumpkins yield tasty seeds full of nutrition, but don’t usually have too much fat in them. Pumpkin seeds can make handy training treats, as well.
A variety of different kinds of seeds may be used to help your gerbil stay occupied. Place a few unshelled seeds around the cage, under bedding or toys. The gerbil will enjoy foraging for the treats and can gnaw the shell off before consuming the food inside.