I use to use this as a bagged rat food for all of my rats until I found Oxbow Regal Rat Food. I switched because studies have shown that dried corn is bad for rats and can even cause cancer and this rat food has dried corn in it. Now I will say that I still use this rat food as a treat for my rats because they like the pumpkin and sunflower seeds as well as some of the other bits, but I pick out all of the dried corn before I give it to them.
Rats like a variety of foods in their diet and I've had rats live to be 4 years old feeding them the mixture of foods and treats that I feed them. I would not recommend feeding this exclusively as a rat food, only as a treat and only if you pick the dried corn out of it.