Because you don't have a steady stream of carbs to fuel your brain. Protein at meals helps time-release the carbs for steady energy rather than up and down spikes. If you're relying only on fleeting foods, such as crackers or bread, you'll only experience short bursts of mental energy, followed by the fog.
About SonarQube SonarQube is an open source platform to perform automatic reviews with static analysis of code to detect bugs, code smells and security vulnerabilities on 20+ programming languages including Java, C#, JavaScript, TypeScript, C/C++, COBOL and more.
Sonar is a system that uses transmitted and reflected underwater sound waves to detect and locate submerged objects or to measure the distances underwater. It has been used for submarine and mine detection, depth detection, commercial fishing, diving safety and communication at sea.