Cranberry
A functional berry with one clearly defined benefit: its A-type proanthocyanidins (PACs) may inhibit bacteria from adhering to the urinary-tract wall. The rest is often marketing — especially the sugary juice. An honest case of a real core wrapped in hype.
Nutrition
Macros
Vitamins
Minerals
Dr. Gundry
Fresh, unsweetened cranberries fit Gundry's yes-grid as a low-sugar, polyphenol-rich berry. His caveat here is practical: commercial cranberry juice and dried cranberries are usually heavily sweetened — exactly what he rejects. So it's the whole, unsweetened fruit that counts, not the sugary product on the shelf.
Dr. William Li · 5×5 system
For cranberries Li emphasizes the microbiome and barrier function above all: the A-type PACs alter bacterial adhesion not only in the urinary tract but also in the digestive tract, and are discussed in connection with a more favorable gut environment. Polyphenols add DNA protection and immune modulation.
Biolazar evidence
The current Cochrane review sees a moderate benefit of cranberry products for preventing recurrent urinary-tract infections, especially in women and children — at a sufficient PAC dose. Important: cranberry does not treat an existing infection and does not replace antibiotics. Other popular promises (detox, broad antioxidant miracles) are poorly supported. And sweetened cranberry juice cancels out the low-sugar advantage.
How to use
For the urinary-tract benefit a sufficient PAC dose is what counts (often more reliable as a standardized extract/capsule than as juice). If juice, then unsweetened and diluted. Because of their tartness, fresh or frozen cranberries work best in combination (unsweetened compote, muesli). Not a substitute for medical treatment of an acute infection.
