Traffic fatalities related to alcohol were increasing. Currently in every state across the US, the drinking age is 21. Each state however, has the ability to increase or decrease the drinking age. In 1984, the federal government created the National Minimum Age Drinking Act to prevent alcohol related deaths from driving. The act involve taking 10% of the highway funding for each state that did not raise the drinking age to 21. To this day, each state raised its drinking age to 21 in order to obtain its highway fundings from the government.
What it does is that it moves the solutes and water out of the filtrate and back into the bloodstream. This is where all of the nutrients is being moved out of the filtrate and into your body hence why you are healthy.