When people ask me why they shouldn't skip protein at breakfast for brain health, I think back to patients who came in complaining of brain fog, poor focus, and mid-morning crashes despite "eating healthy." In my experience, breakfast without protein sets the brain up for instability because protein provides the amino acids needed to make neurotransmitters like dopamine and serotonin, which directly affect attention, mood, and memory. I've seen this repeatedly in practice: patients who start the day with only carbs feel sharp for an hour, then crash hard. Once they add protein, their mental clarity and energy become noticeably steadier. From a neurologic perspective, protein also helps stabilize blood sugar, which is critical for the brain since it relies almost entirely on glucose for fuel. Spikes and dips from a low-protein breakfast can impair concentration and stress the brain over time. I often tell patients to think of protein as the brain's "building material" for the day—without it, you're asking your nervous system to function on empty. A simple shift, like adding eggs, Greek yogurt, or a protein-rich smoothie in the morning, is one of the most practical ways I've seen people improve cognitive performance and long-term brain health.