R.A.T.S. is a 5 week animal feeding and growth study that gives students hands-on experience in basic research methods while they explore nutrition concepts. In the study students observe and measure growth differences between two albino rats being fed different diets. The control rat, Jerry, eats a diet that includes foods from each of the five body building food groups of the food guide pyramid. The test rat, Tom, eats a diet with foods from four of the five food groups. The test rat does not eat or drink foods from the milk group.