MERRY CHRIST-MYTH
Science responds to the lore about deadly flowers, hangover cures and added pounds while feasting
Are poinsettias really poisonous? Are snowflakes really pure as the driven snow? Does feasting really put on the pounds? Sure as sugar plums, myths and misconceptions pop up every holiday season. Here’s what science says about some of them:
FLOWER POWER
Poinsettias, those showy holiday plants with red and green foliage, are not nearly as harmful as a persistent myth says. Mild rashes from touching the plants or nausea from chewing or eating the leaves may occur but they aren’t deadly, for humans or their pets. Poinsettias belong to the same botanical family as rubber plants that produce latex, so some skin rashes occur in people allergic to latex. According to a Western Journal of Emergency Medicine research review, the plant’s toxic reputation “stems from a single unconfirmed death of a twoyear-old in Hawaii in 1919.”
Dr. Rachel Vreeman, an Indiana University pediatrician who has researched holiday myths, cited a study on more than 20,000 poison control centre reports involving contact with poinsettias.“In none of those cases were there deaths or serious injury. In fact, more than 95 per cent of them required zero medical care,” she said.
THE WHITE STUFF
To form snowflakes, moisture high in the atmosphere is frozen by clinging to particles that may include dust specks or soot. Add germs to that list. University of Florida microbiologist Brent Christner has found that bacteria commonly found on plants are surprisingly abundant ice “nucleators” present in snow from populated areas, barren mountain peaks and even Antarctica.
So is catching snowflakes on your tongue a bad idea?
“There’s a yuck factor,” Christner said. “It’s better than yellow snow.”
MOODY BLUES
The same things that can make holidays merry — great expectations and family time — can also be stressful. Holiday blues are a real thing for many people grieving loss or absence of a loved one, and wintertime can trigger true but transient depression in some people, a condition sometimes called seasonal affective disorder. It’s linked with lack of sunlight in winter and some scientists think affected people overproduce the sleep-regulating hormone melatonin. But contrary to popular belief, suicides peak in springtime, not winter. No one has figured out why.
HAIR OF THE DOG
Forget that Bloody Mary. If extra shots of bourbon in your eggnog have you feeling lousy the next day, drinking more alcohol — hair of the dog — won’t cure you.
Here’s what George Koob, director of the National Institute on Alcohol Abuse and Alcoholism, has to say about that:
“You are in a sense selfmedicating a mild withdrawal syndrome by drinking more. The problem is that’s going to wear off and you’re going to have an even worse hangover.”
Alcohol is dehydrating so replenishing with lots of water or other non-alcoholic drinks can help relieve the symptoms. But experts emphasize that prevention is the healthiest cure.
DOUGHN’T EAT IT
Sampling holiday cookie dough, or any raw dough, can make you sick. And recent research says it’s not just because dough often contains raw eggs, which may harbour salmonella bacteria. Flour is another culprit. A study in the New England Journal of Medicine details a 2016 E. coli outbreak that hit dozens of people in 24 states that was linked to flour. Some patients had eaten or handled raw dough made with flour contaminated with that bacteria. Authorities recalled 10 million pounds (about 4.5 million kilograms) of flour, some of which had been sold to restaurants that allow children to play with raw dough while waiting for their meals. Baking generally kills any bacteria.
THE BOTTOM LINE
The truth about holiday weight gain depends on whether your Champagne glass is half empty or half full. One study says it’s commonly assumed that the average American gains five pounds between the U.S. Thanksgiving and New Year’s Day. But the study authors found the average was a little less than a pound. Other studies have found it’s closer to two pounds. The problem, Vreeman says, is the extra pound or two at holiday time becomes an annual pattern and adds up.