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Berries
Berries are high in anthocyanins, plant pigments that have antioxidant properties and may be linked to a lower risk of cancer. In one human trial, bilberry extract was given to 25 persons with colorectal cancer for seven days, and the growth of cancer cells was reduced by 7%. A lesser study gave freeze-dried black raspberries to patients with oral cancer and discovered that it reduced indicators of cancer progression.
Freeze-dried black raspberries decreased the incidence of esophageal tumors in rats by up to 54% and reduced the number of tumors by up to 62%, according to one animal study. Another research revealed that a berry extract inhibited several cancer biomarkers in rats. According to the researchers, eating a serving or two of berries each day may help prevent cancer. Keep in mind that these are animal and observation studies looking at the effects of a high concentration of berry extract, and more human research is needed.