The liquor is more alcohol per volume than beer, and is thusly, lighter.

So if you down a bunch of vodka and finish with beer– the beer will just sink straight to the bottom of your stomach and cause this horrible churning action, as the lighter liquor quickly rises to the top.

The correct saying is "Beer before liquor, never sicker. Liquor before beer, never fear." and it is referring to the ability to drink alcohol without getting sick (vomiting, nausea) at the time of ingestion and the order in which one should ingest these wonderful things.

We've all taken that shot or drink that just didn't sit well with us. That is what these sayings deal with, not with the next morning hangover.

And for the scientific evidence – no research was cited in the link and the assistant professor who was quoted holds a degree in psychological sciences, which deal with human activities and their mental applications, not with the actual chemical reactivities within the body.

This report is flawed along with the MSNBC report to which this report was based on.

Tips:

Eat a good meal before drinking. This will help slow the process and allow better management of your drinking. Pasta good, salad bad.

If you're getting over the top, just stop and drink a couple pints of water. If you don't want to look like a wuss, drink club soda with lemon/lime.

Don't be brave and feel you have to keep up with anybody. Worshiping the porcelain God is never fun, so keep that image of you with your head in the toilet on someone's facebook page in the back of your mind at all times.

If you simply must get wasted, put on a good buzz then stick to beer. Also, learn to make low-proof shot drinks. Kamikazes and Red Death's come to mind, 'cause you can whip up a pitcher and drink 'em with your friends, and they do less damage than a straight shot of tequila or vodka.

This may sound stupid, but practice makes perfect. Find out what works for you and remember that formula. Modify according to how f*cked up you want to be. The one guy who mentions "if you have to count you have a problem" fails to keep in mind that girls weigh a lot less than guys do. Find your limits and stick to them… no matter who eggs you on. I don't need to play drinking games to get trashed, but I do know that when I can't see the other end of the beirut table (beer pong), it's time to lose that round.

If you're seeing double, STOP F*CKING DRINKING (lots). Have some water, eat something, take a break. You can always resume drinking later.

Wow, that was wordy… sorry! Hope this helps!