Three thousand five hundred calories in one meal. Maybe you’re so tired after all that turkey, stuffing, potatoes, cranberry sauce and pie because it’s a big job just lifting the fork to your mouth so many times and chewing all that food.
Or maybe, just maybe, it’s those celebratory beers, cocktails or glasses of vino.
For years people have blamed the turkey, saying it’s the natural chemical L-tryptophan in it that is the culprit.
But really, does turkey contain a substance that makes you tired? The answer is yes, but it’s probably not the one you’re thinking of. It may be the stuffing, not the tryptophan. And the Thanksgiving meal of potatoes, bread, rolls and pie also have a lot of carbs that may contribute to a feeling of drowsiness.
And then, your innards are full of food that the body has to use a lot of energy to digest, which also may contribute to drowsiness.
The Internet is divided on the question as to whether tryptophan induces sleep. A source we’ve used on this blog before, the National Sleep Foundation, says tryptophan, an amino acid found in turkey, does indeed make you tired because it spurs the body’s production of serotonin, which in turn turns on the melatonin.
Some vitamin companies make pills out of melatonin to help people regulate their sleep patterns and get to sleep more easily, but the National Sleep Foundation says melatonin pills have no effect in improving people’s sleep.
A blog on HealthyWomen.com calls postprandial somnolence (after-meal sleepiness) a “food coma.” A dietitian in that posting blames the carbs:
‘Carbohydrates have to be present in order for the serotonin levels to be impacted,’ explains Joy Dubost, PhD, a registered dietitian and a spokesperson for the Academy of Nutrition and Dietetics. ‘Thanksgiving turkey plus stuffing might be the combination needed to do that.’
It’s more likely that plain old overeating and possibly alcohol consumption are what create the sleepiness associated with food comas, she says. Those factors, coupled with the tendency for people to be ‘winding down and relaxing, all leads to a sense of being tired.’
But cheese, eggs, yogurt and other kinds of meat, in a word high-protein foods, also contain tryptophan, and those foods don’t have the reputation for making one sleepier than other kinds of foods. In fact, chicken contains more tryptophan than turkey even. But those high-protein foods also contain other substances that block the brain’s uptake of tryptophan, essentially canceling out its drowsy effects.
But many of us have had that experience at work where we come back to the office or job site and it’s all we can do stay awake. The same thing happens to many people on Thanksgiving and other holidays—whether the host serves turkey or not.
According to the Huffington Post, when a person eats high-calorie meals with a lot of carbs, sugar and fat, the body produces a lot of glucose. Glucose, a type of sugar, has a big effect on what scientists call orexin neurons in the hypothalamus that produce a protein that regulates wakefulness. This process involving the parasympathetic nervous system makes the body relax and do the work of digestion instead of going out to seek for more food.
Another chemical produced in the body that is released upon eating a big meal is insulin, which is involved in digestion. Insulin induces the body to release more serotonin and melatonin (again), both of which bring on the drowsiness and, oh happy day, feelings of well-being.
Or, the way Wired puts it:
What really seals your fate in dreamland, however, is the fact that you probably just ate way too much food. Regardless of whether you even ate any turkey, eating large portions of anything will leave your body with a ton of food to digest. That takes up a lot of energy, so while your innards are doing their work, your brain is signaling to the rest of your body that it’s time to take it easy and reserve energy.
There isn’t much to read in a quick Google search about avoiding drowsiness after a holiday meal, but there is plenty on how to avoid it after a workday lunch. For one thing, it’s natural for a person to feel sleepy about seven hours after waking, says a 2007 article in The New York Times.
The Times gives several ways to avoid the post-lunch dip, as it’s called:
There is one way to avoid feeling so sleepy on Thanksgiving or after other holiday meals: Eat much less food. After all, 3,500 calories are a bit much. Especially if you need to drive home, it’s important to remain alert.
Heck, you probably don’t have to work anyway after your holiday meal anyway. Why not just take a nap after your feast? You might as well put all that serotonin and melatonin to good use.
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