All berries reduce the risk of and fight cancer. Your best sources include fresh and frozen. Choose berries from the area you live in. Each part of the world has their own cancer prevention berry sources.
You should limit your consumption of fruit juices since they contain higher concentrations of sugars. A 1/4 cup or 125 ml (4 oz.) is the upper limit of acceptable calories since the liquids typically don’t contain fiber to blunt the sugar impact.
You should avoid fruit juices that contain added sugars/pear juice/apple juice/fructose since they are concentrated sugar sources.
When and if possible, you should choose organic sources to reduce your risk of pesticide and chemical exposure.
Medical references include
Yeary KHK, Quisenberry A, Hall MG, Yu H, Henry WAE, Rodriguez EM, Zoellner JM. Sweet Beverages and Cancer: A Scoping Review of Quantitative Studies. Cancer Prev Res (Phila). 2022 Mar 10:canprevres.0507.2021. ...