For many, there is little, if any, inevitable after-lunch sleepiness. So why do we really feel sleepy after eating? When you think about it, food is a source of energy, something that brings energy, not something that depletes energy and kills the body, right?
Unfortunately, the behavior of the human body is not so easily, so simply understood; There are many factors that determine how tired a person feels.
“When we eat a meal, it triggers a series of actions in the gut and throughout the body,” says Claire Shortt, a nutritionist with a background in microbiology. According to Shortt, fluctuating blood sugar levels may be one factor contributing to the sleepiness we feel after eating. "When we eat foods high in sugar, it can cause our blood sugar to spike and then drop quickly," she explains. The resulting drop in blood sugar can lead to sudden fatigue.
However, as our hormones also play a role, it's not the only thing to consider when trying to avoid this late afternoon 'crash'. After eating, we sometimes see immediate increases in the production and release of serotonin (a neurotransmitter involved in sleep, depression, and memory, etc.). Although this is colloquially known as the 'feel good hormone', it can have other side effects as well.
“Elevated hormone levels can make us feel a little sleepy,” says Shortt, “and some researchers suggest that elevated levels of the hormone serotonin are responsible for this. "Serotonin plays a critical role in our mood and sleep cycles, and when levels rise after eating, it can make you feel sleepy."
A review of these studies published in the journal Sports Medicine states: "Serotonin has been implicated in fatigue because of its prominent effects on sleep, lethargy and sleepiness, and loss of motivation." Serotonin plays an important role in this matter, although the same report notes that stronger evidence is needed to confirm it.
So, although it's impossible to say for sure, the rise in serotonin levels after a meal may account for that unbearable sleepy feeling.
What foods make people sleepy the most?
Shortt believes that certain foods are more likely to cause fatigue than others. “A diet high in the amino acid tryptophan (an amino acid found in proteins; essential for growth and normal metabolism) can cause some sleepiness. This is because it is involved in the production of serotonin. Tryptophan is found in many protein-rich foods such as cheese, eggs, turkey, and tofu.
"Some other foods, like cherries, can affect your melatonin levels, which can promote sleep. You can even buy milk with high levels of melatonin in the market, thus helping to promote sleep.”
A 2015 study on the physiological effects of melatonin, published in the journal Neurochirurgie, confirms the link between melatonin levels and sleep. It also states: "There is some evidence that melatonin stabilizes and strengthens circadian rhythms, particularly core temperature and sleep-wake rhythms."
However, it is difficult to provide a definitive list of substances that should be used for a less melancholic or pessimistic mood after eating. According to Shortt, this is because allergies or intolerances can also affect a person's response to certain foods.
"Feeling tired, or sometimes feeling 'crazy' after eating, is common in people with food allergies and intolerances, or in people with a condition called small intestinal bacterial overgrowth (SIBO). SIBO can be diagnosed with a glucose or lactulose breath test. If you suspect you have SIBO, you should see your doctor.”
How to avoid feeling sleepy after eating?
While researchers still don't have a definitive answer as to why people sometimes feel sleepy after eating, Shortt says there are several steps people can take if they're trying to increase their productivity levels in the afternoon.
"Adding high-fiber foods to your diet can help stabilize your blood sugar and prevent it (sugar levels) from plummeting, so you're less likely to feel drowsy," says Shortt. “Try to eat food on a regular basis; Also, avoid eating large portions of food. It (eating too much) can overload your digestive system, making you feel tired and lethargic.”
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