For many college students, drinking is a way to relax. But for a certain subset of people, there's nothing relaxing about an after-class beer. Consuming even a single alcoholic drink brings them embarrassing or unwanted attention, and physical discomfort.

"I get called tomato, cherry. Or I'll be compared to something red in the room," LSA junior Annie Layno-Moses said. "Like, 'Hey, you're as red as that girl's lipstick.' "

Layno-Moses experiences a condition known as an alcohol flush reaction. It is also commonly referred to as "Asian flush syndrome" or "the Asian glow" because it occurs frequently in certain Asian populations. Several studies estimate that about 50 percent of Chinese, Japanese and Korean people have this condition, weakening their ability to process alcohol. But these terms are somewhat misleading because any person can experience this reaction, regardless of their ethnicity.

As it turns out, whether or not someone gets a flushed face after drinking, and a slew of other symptoms including nausea, vomiting, increased heart beat and dizziness - is dictated by the same thing that determines most of our other physical traits: our genes.

When most people drink alcohol, enzymes in their guts break it down and turn it into things that the body can eliminate as waste or store for energy. But some people have genetic mutations that keep the enzymes from doing their job, causing acetaldehyde - a toxic substance - to build up in their blood when they drink.

Robert Winfield, director of the University Health Service, said certain ethnicities may be able to tolerate alcohol better than others for the same reason that men typically have a higher tolerance than women - they come equipped with stomach enzymes that are more efficient at processing alcohol.

There are different genetic variations that all result in complications with this enzyme, but what the exact effects will depend on the kind of hereditary machinery you're packing. As with other genetic quirks, you can thank mom, dad or both for this one. Each parent bequeaths a copy of the gene that codes for acetaldehyde dehydrogenase (ALDH2), the enzyme that breaks down alcohol's toxic byproduct, acetaldehyde. Drinking side effects differ in intensity, depending on whether a person has one, two or no mutant copies.

Studies suggest that the ALDH2 mutation that causes alcohol flush is dominant, so one dose of the mutant gene will result in physical symptoms. But the dominance is "incomplete" because the physical reactions of people with one normal gene and one abnormal gene differ. In some cases, such people experience hardly any symptoms - the regular copy of the gene picks up the defective copy's slack by making enough enzymes to eliminate the toxins before too much builds up.

People who have a double dose of mutated genes will almost certainly show flushing symptoms when they consume alcohol. Not surprisingly, it's almost unheard of for these homozygous individuals to end up as alcoholics. Large-scale studies throughout several populations have shown that there is less alcohol use and abuse among Asians.

The enzyme disorder is so effective in deterring alcohol abuse that some alcoholism recovery methods have tried to recreate it. Drugs like Antabuse that help recovering alcoholics stay off the bottle by recreating the effects of the genetic condition. Antabuse works by temporarily impairing the ALDH2 enzyme to create toxin build-up as experienced by people with the genetic mutation. When the drug leaves the system, the body is once again able to process alcohol.

If alcoholics can be convinced to ditch the bottle when they experience the physical symptoms of alcohol flush reactions, yet people who are genetically bound to the symptoms continue to drink, what does that suggest about other forces at play reinforcing the appeal of drinking? Never underestimate the power of peer pressure.

While some with the condition get embarrassed by their blushing phenotype or sick of feeling too sick, and quit drinking, others refuse to let their symptoms keep them away from the keg line.

Several Facebook groups bring together those who have the conditions to share possible remedies and alcohol flush pride. ("I get the Asian Glow/Flush... But I'm not fuck'd up dumbass!!," "I Rep the Asian Glow... so what?" and "Asian Glow is Damn Sexy").

Layno-Moses, who has one Filipino parent and white parent, said she continues to drink a few times a week even though her symptoms caused by the condition can be dangerously drastic. She said that for her, there is no in-between or tipsy - "It's either completely sober or completely drunk."

"One and a half shots and I'm wasted," Layno-Moses said. "It doesn't matter how much I drink or how often I drink, my tolerance doesn't change."