The brain represents approximately 2% of body mass. It consumes roughly 20% of the body’s energy. It is acutely sensitive to the quality of the fuel it receives — more sensitive than most professionals realise, and more directly connected to cognitive performance, mood, and stress resilience than most wellbeing conversations acknowledge.

The Blood Sugar–Performance Connection

The most immediately relevant nutritional factor for workplace performance is blood glucose regulation. High-glycaemic meals — refined carbohydrates, sugary drinks, the typical fast hawker options eaten quickly at a desk — produce rapid blood sugar spikes followed by crashes that impair attention, working memory, and decision-making for hours afterward.

The afternoon slump that many Singapore professionals attribute to the heat or to simple tiredness is, in most cases, a blood sugar crash directly traceable to what was eaten at lunch. This is not inevitable. Lower-glycaemic meals — with adequate protein, fibre, and complex carbohydrates — produce flatter, more sustained energy curves that support consistent afternoon performance.

Singapore’s Nutritional Landscape

Singapore’s hawker culture is both an opportunity and a challenge. Many traditional dishes — yong tau foo, thunder tea rice, fish soup with mixed vegetables — are nutritionally excellent. Others — heavily processed, high in sodium and refined carbohydrates — are nutritionally poor despite being delicious and affordable.

The single most impactful nutritional habit available to most Singapore professionals is adding a portion of vegetables to every hawker meal. This is universally available, requires minimal effort, and significantly improves the nutritional profile of virtually any dish.

The Gut-Brain Axis

Beyond immediate energy regulation, nutrition shapes wellbeing through the gut-brain axis — the bidirectional communication pathway between the gastrointestinal tract and the central nervous system. Approximately 90% of the body’s serotonin is produced in the gut, not the brain. The composition of the gut microbiome influences mood, cognitive function, and stress reactivity in ways that research is only beginning to fully document.

The practical implication is that dietary diversity — particularly diversity of plant foods — is not just a long-term health investment. It is a mood and cognition investment with relatively rapid returns. Research suggests that meaningful improvements in gut microbiome composition can be observed within weeks of dietary change.

Nutrition is one of the four core dimensions in our Self-Care for Sustainable Well-Being course — because what you eat is not separate from how you perform, connect, and recover. Self-Care for Sustainable Well-Being.