My "crazy" friend was doing okay, back in July [ref: my comment history]. I watched her open a bottle of sugar free electrolyte drink concentrate and drink a serving. Over the course of the next hour she got paranoid and flipped on me, "DON'T FOLLOW ME, I DON'T KNOW YOU", and disappeared.
Brains need glucose and fructose, b-vitamins, thyroid hormone, vitamin A, etc. Stressed brains use more glucose than brains at rest. Old people commonly lose their metabolisms.
I think what I observed was the fake-sugar in the sugar-free drink causing insulin release -> low blood sugar. The normal response to low blood sugar is cortisol release, but people who have a tendency to psychotic disorders can't make cortisol. It was fascinating to watch & reconstruct.
p.s. your sci-hub link is titled "Characteristics of U.S. adults taking prescription antipsychotic medications, National Health and Nutrition Examination Survey 2013–2018"