Fiber Increases Deep Sleep While Saturated Fat and Sugar Disrupt Sleep Architecture

What was said

"We found that higher intakes of fiber were associated with more deep sleep, higher intakes of saturated fat, less deep sleep, and then more refined carbohydrates, simple sugars, more arousals. You're not getting deep slow-wave sleep, REM sleep, as much as you would otherwise."

Analysis of controlled feeding studies showed that dietary composition directly impacts sleep quality within hours. Higher fiber intake increased slow-wave deep sleep, while saturated fat reduced it and refined carbohydrates caused more nighttime arousals. The findings establish a direct causal link between same-day food choices and that night's sleep architecture, measured by polysomnography.