If you have ever justified eating dark chocolate by calling it “healthy,” you might finally have a real excuse: it turns out your brain might like it as much as your taste buds do. A study published in May this year showed that dark chocolate may offer short-term benefits, and even 35 grams can temporarily boost personal memory, reaction time, spatial memory and visual processing.

Dark chocolate contains cocoa flavonoids, plant compounds that have been linked to improvements in cognitive ability. Researchers believe that these flavonoids support brain function by increasing blood flow and promoting more efficient neural activity. 

Senior Jessica Hu used to eat dark chocolate before her exams because her parents told her it would improve her results, but she eventually stopped after not noticing measurable impacts.

“I think [eating dark chocolate] is mostly a placebo,” Jessica said. “Usually, I’ve noticed math contestants eating it around 5 or 10 minutes before the contest, but there are studies showing that the effects of the flavonoids in the chocolate kick in after 30-60 minutes. There’s [a] paradox between being logical as a math competition contestant, but also being illogical in believing that chocolate immediately before the test will help you in some way.” 

Beyond flavonoids, other compounds in dark chocolate, like caffeine, are found to have mildly energizing effects. Chocolate also contains small amounts of theobromine, which can have beneficial cardiovascular effects without the side effects of stronger stimulants, potentially supporting short-term focus.

However, the amounts in a typical chocolate bar are smaller compared to other caffeinated sources like coffee or energy drinks, and their respective impact can vary widely depending on the person. Biology teacher Mike Pistacchi notes how a person’s caffeine intake influences their daily behavior.

“Our nervous system functions are very closely linked with our blood sugar, circadian rhythms and any kind of stimulants that we’re eating, like caffeine,” Pistachi said. “It’s absolutely true to say that what we eat affects how our brain performs, but it’s also unbelievably complicated. The question is, how much chocolate would you have to eat to get the equivalent of an energy boost from a cup of coffee?”

An average ounce of dark chocolate contains a significantly smaller amount of caffeine than sugar. Jessica reflects on how the higher sugar concentration can lead to people relying on chocolate for longer periods of time, when the boost fades quickly.

“With chocolate in general, people are looking for the effects of the sugar more than the effects of the caffeine because there’s so little caffeine and comparatively more sugar,” Jessica said. “The problem with depending on sugar is that you have a boost of energy within 20 minutes, but you crash very quickly. Because of this, it could be very detrimental.”

Dark chocolate is higher in cocoa content than milk and white chocolate, meaning that it has less sugar and more concentrated flavonoids. However, a person’s response relies heavily on the timing of their consumption and digestion. 

The benefits that people ascribe to dark chocolate are often caused by other factors, as the emotional state of the mind and personal routines play a major part in focus and memory. Math department chair Anthony Silk highlights that these broader factors often have a greater impact on performance than a single supplement. 

“Certainly, if you have caffeine and it wakes you up, you can process better,” Silk said. “Regardless of chocolate, some students definitely have rituals for assessments, and you can see them; the students line up pencils on their desks and do other things like that. The way they arrange materials, sit and study affects each of them individually.”

Research on dark chocolate does hint at possible cognitive benefits, but the effects are generally short-lived. Small gains from consuming chocolate bars are outweighed by more dependable methods of improving results, such as consistent studying. 

Dark chocolate’s cognitive benefits may be milder than popular belief suggests, but for many students, the ritual of eating chocolate can provide a sense of comfort and confidence through the placebo effect. While surely not a substitute for exam preparation, dark chocolate can still be a ritual worth keeping.