After lunch, just a square of chocolate is enough for many people to feel that the meal is complete. On more stressful days, the desire seems even greater. The habit, quite common among Brazilians, goes beyond the preference for sweet taste: it involves brain mechanisms related to pleasure, reward and even the search for emotional comfort.

Studies gathered by National Geographic Brasil in 2025, based on research published in Science magazine and analyzes by the National Institutes of Health (NIH), show that compounds present in cocoasuch as theobromine, associated with sugar, stimulate brain areas linked to the reward system. This process favors the release of neurotransmitters, such as dopamine and serotonin, related to the sensation of pleasure and well-being.

According to doctor Renato Gama, postgraduate professor of Neurology at Afya Educação Médica in Rio de Janeiro, this response from the body helps to explain why chocolate is often associated with a feeling of comfort, especially after meals or in moments of greater tension.

“When we eat chocolate, especially those that combine sugar and fat, the brain’s reward system is activated. There is a release of dopamine, which is related to the sensation of pleasure, and this causes the brain to register that food as something desirable. In stressful situations, when cortisol levels are high, this search for highly palatable foods tends to increase precisely because the body is looking for a quick reward”, he says.

The stimulating effect of cocoa

In addition to the feeling of pleasure, many people report feeling more energetic after consuming chocolate. This effect, according to the neurologist, is real, but is usually temporary. There is a temporary increase in energy caused mainly by sugar and the presence of theobromine, a natural stimulant of cocoa similar to caffeine, but milder. This stimulus usually lasts for a short time and should not be confused with a real gain in physical or cognitive performance throughout the day.

Research continues to investigate how cocoa acts on the brain. The study “Astringent flavanol fires the locus-noradrenergic system, regulating neurobehavior and autonomic nerves”published in the journal Current Research in Food Science, identified, in experiments with animals, that the flavanols present in cocoa can stimulate brain areas related to alertness and attention even during flavor perception, even before the compounds are absorbed by the body. Although the results still need to be confirmed in humans, the work expands understanding of the effects of food beyond the action of sugar.

Not all chocolate offers the same benefits

Despite the benefits attributed to cocoa, nutritionist Andressa Cabral, professor at Afya Unigranrio on the Duque de Caxias and Nova Iguaçu campuses, explains that choosing the type of chocolate makes a difference to your health. “The higher the concentration of cocoa, the greater the amount of bioactive compounds, such as flavonoids, which have antioxidant action. Milk chocolates, and especially white chocolates, have a higher amount of sugar and fat and a lower level of these beneficial compounds”, he warns.

According to the nutritionist, this does not mean that it is necessary to completely eliminate the sweetest chocolates from your routine, but consumption must occur in balance. “Chocolate can be part of a healthy eatingas long as it is consumed in moderation. Ideally, it should complement a balanced eating routine and not be used as a strategy to alleviate emotions or compensate for stressful situations. When this happens frequently, it is worth checking whether this relationship with food is not replacing other ways of dealing with emotions,” he says.

By Maria Clara Montanha