Carbohydrates and sugar: how do fast carbs affect productivity and concentration during code reviews?

For developers, the code review process requires extreme attention, logical thinking, and the ability to keep many small details in mind. When you snack on cookies, a bun, or candy right before starting to review a complex pull request, your blood sugar level skyrockets. The brain receives a powerful rush of energy, and for the first 15–20 minutes, it seems to you that productivity has reached its peak.

However, the sharp rise is inevitably followed by an equally sharp drop. The pancreas releases a large dose of insulin into the blood to process the excess sugar, causing glucose levels to drop below normal. This state of hypoglycemia manifests as sudden lethargy, absent-mindedness, and that exact brain fog. Missed critical bugs in someone else's code are often precisely the result of trying to perk up with fast carbs before a task.

To maintain high concentration during monotonous and complex analytical work, it is better to replace sweets with slow carbohydrates combined with proteins and fats. A handful of nuts, a whole grain toast with avocado, or a portion of cottage cheese will work well. Such foods provide a stable supply of energy to the brain for several hours, preventing sharp emotional and cognitive swings.