How does fasting affect focus?

Fasting can affect focus and concentration in various ways, as discussed by Andrew Huberman. When you are fasted, the reduction in parasympathetic activation—that typically happens when you eat—can enhance your ability to focus. This is because eating, especially large amounts, can make you sleepy by shifting your nervous system towards a more relaxed state and diverting blood to your gut. Thus, many find fasting beneficial for maintaining better concentration and alertness. Notably, fasting may make you more responsive to stimulants like caffeine, which could boost your focus further when you're fasted compared to when you've just eaten a large meal. However, Dr. Huberman also notes the importance of having sufficient blood glucose levels since neurons use glucose to function optimally. Therefore, while some fasting can enhance focus, it’s crucial to balance your blood glucose levels to sustain cognitive functions and mental clarity 1 2.

In summary, fasting can potentially increase your focus if managed correctly ensuring proper hydration, electrolyte balance, and mindful timing of caffeine intake. However, it's important to avoid being overly hungry or distracted by thoughts of food, which can counteract these benefits.