This Fruit Measurably Lowered Cortisol in a Real Study

New research published in Clinical Nutrition had participants drink a cranberry beverage daily and tracked their cortisol — the hormone the body releases under stress — alongside cognitive testing.¹

What the study found

People drinking the cranberry beverage showed a measurable drop in their daily cortisol pattern, along with improvements in short-term and phonological memory — the kind involved in recalling words and sounds. This is a notable pairing: cortisol and memory performance are linked biologically, since chronically elevated cortisol is associated with impaired short-term recall.

The detail that matters if you're trying this

Most bottled cranberry juice on grocery shelves is loaded with added sugar — cranberry cocktail blends are typically more sugar than fruit. The research used unsweetened or diluted tart cranberry juice, not the sweetened version most people default to. Any benefit tied to cranberry polyphenols is likely diluted or offset by the added-sugar version.

The practical takeaway

• Look for unsweetened or "100% tart cranberry juice," not cranberry cocktail
• The effect studied was on a daily-consumption basis, not occasional
• This pairs with — not replaces — the more established stress-management basics (sleep, movement)