German neuropsychologists have determined that consuming sugar just before a relaxation session can entirely negate its positive effects. Even when an individual perceives themselves as calm, their nervous system remains in an elevated state of readiness.
Scientists have long been aware of sugar’s function during stressful periods: a small sweet snack before an exam or competition indeed provides the body with an added energy boost. Sugar promotes the generation of cortisol and sustains an accelerated heart rate, assisting with necessary mobilization at critical junctures. Nevertheless, the impact of sweets on the body’s capacity to unwind had been largely unexplored until recently.
Researchers from the University of Konstanz, led by Professor Jens Pruessner, undertook to fill this knowledge gap. Ninety-four healthy volunteers participated in the study, which was reported in the International Journal of Psychophysiology. Some participants were given a glucose-containing drink on an empty stomach, while the remainder consumed only water. Subsequently, some subjects underwent relaxation via massage, while others simply rested. Throughout the entire procedure, indicators of cardiac activity were continuously recorded for everyone, as noted by Medicalxpress.
The findings were illuminating. All participants subjectively experienced a sense of ease, and the parasympathetic nervous system—the system responsible for rest and repair—did indeed become active in all cases. However, in the group that ingested glucose, the sympathetic nervous system, which governs mobilization during stress, was simultaneously activated. “This implies that the body maintained a high state of alert despite the subjective feeling of tranquility,” explained Maria Mayer, the study’s lead author.
Professor Pruessner highlighted that people often associate sweets with leisure: chocolate during a movie or dessert on a weekend. Yet, scientists suggest this very habit might impede complete recovery. For those who engage in meditation, massage, or other relaxation techniques, the researchers advise refraining from high-sugar foods immediately prior to their session.
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