Anthocyanins

Bilberry Tea: Benefits for Eyesight and Blood Sugar, How to Prepare and Side Effects IMPORTANT: Bilberry tea — whether made from the fruit or the leaves — is a natural support, not a treatment that replaces prescribed medication. If you have diabetes and take blood-sugar-lowering medication or insulin, bilberry leaf tea may add to the drop in blood sugar, so monitor your levels and talk to your doctor before drinking it daily. People taking anticoagulants (such as warfarin) should be cautious, since bilberries contain compounds that may influence clotting. Pregnant or breastfeeding women should use bilberry leaves only occasionally and after consulting a doctor. Leaf tea should not be drunk in large amounts over long periods, because of its tannins and traces of hydroquinone. In children, bilberry fruit is safe and beneficial, but concentrated leaf tea should be given with care. At any unusual symptom — dizziness, nausea, allergic reactions — stop drinking it and seek a specialist’s advice. ...

Blueberries: Benefits, Antioxidants, Uses and How to Consume Them IMPORTANT: Blueberries are a safe and healthy food for most people, but a few situations call for caution. Those taking anticoagulant medication (such as warfarin) should talk to their doctor before consuming large amounts of blueberries or concentrated supplements, since berries can influence blood clotting. People with irritable bowel syndrome or fructose sensitivity may experience bloating with large portions. Wild blueberries picked in nature must be washed well and gathered only from clean areas, far from roads and from crops treated with pesticides. Do not confuse true blueberries (Vaccinium myrtillus, with colored flesh) with other unknown blue forest fruits. Enjoy them as part of a varied diet, not as a substitute for medical treatment. ...