This is half-assed science.
Berries offer numerous benefits beyond flavonoids. They are excellent sources of vitamins like Vitamin C and folate, fiber, and minerals. Some berries, like cranberries, are known for their unique properties, such as reducing the risk of urinary tract infections. Berries also contribute to heart health, potentially reducing the risk of cardiovascular disease. Additionally, berries can positively impact cognitive function and may help regulate blood sugar levels.
Must be true. I have never seen a bird with UTI (urinary tract infection).