Just a quarter cup of blueberry juice a day improves memory in older adults, according to a new study.

Blueberries are a top brain food. In addition to memory, they help depression and protect brain cells. Blueberry juice is available in most grocery stores or can be made by blending frozen blueberries with water.

In this study, the juice enhanced the brain’s blood-flow and activity levels. It took about 3 months to work. Blueberry juice is also being used in combination with other natural ingredients to treat postpartum depression. Read more about diet and and the brain.