Whatever we eat is converted by our body into glucose, which provides the energy our brains need to stay alert. When we’re running low on glucose, we have a tough time staying focused, and our attention drifts. This is why it’s hard to concentrate on an empty stomach. Also, not all foods are processed by our bodies at the same rate. Some foods, like pasta, bread, cereal, and soda, release their glucose quickly, leading to a burst of energy followed by a slump. Others, like high-fat meals, provide more sustained energy but require our digestive system to work harder, reducing oxygen levels in the brain and making us groggy.
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