To appropriately reflect the actual cost of travel and to discourage unnecessary travel, change the per diem rates so that travelers do not eat for free and make a profit. When a Government worker is not on travel they have to pay for their own meals--either at home or if they eat out. Therefore, when a Government worker is on travel the cost of their meals that they would normally pay for when they are home should be subtracted from the per diem for the trip. No need to make it complicated--just reduce the per diem rates by 10 to 20 percent to reflect the cost of what a traveler pays for food when home. Doing so would save tens of millions of dollars.