If you’ve knocked back a few and feel a warm flush creep up your face and ears, you’re not alone. While often thought of as annoying rather than dangerous, alcohol flush may be a sign of something more serious brewing beneath the surface, a new study suggests. Roughly 8% of the global population experiences the drunken sensation, mostly in East and Southeast Asian demographics, which has been previously dubbed “Asian glow.” But it’s more than just a nuisance on a night out — the flush is caused by an inherited, genetic hiccup. Those with the gene variant ALDH2*2 are deficient...