This is an awesome site that the folks at the USDA have put together. Be sure and participate with the Food Data Central aspect of nutrition. The government out did itself with nutrition.gov.
“As Americans with God, we have helped save the world against starvation. If you want to stop a war, feed a poor man and show him how to fish and plant crops. If you want to start a war, starve the poor man. If you want to destroy a society deny them access to the only living God.”