Severe caloric restriction sometimes impairs concentration and mental clarity, likely due to low glucose availability and potential micronutrient deficiencies
A guide for prescribing medicines to manage overweight and obesity - Prescribing orlistat, liraglutide and semaglutide
Chemosphere 52 , 951958 (2003)
Another interpretation, elephant in the room, could be that higher protein intakes cause more oxidative stress due to the increased deamination and higher urea/ammonia - just a thought.
doi:10.1263/jbb.105.409 Xiong Z, Guo M, Guo Y, Chu J, Zhuang Y, Wang NS, Zhang S (2010) RQ feedback control for simultaneous improvement of GSH yield and GSH content in Saccharomyces cerevisiae T65
The ribofuranose tetraacetate, shown at the upper left below, was the source of an early puzzle involving polymorphism