Walnuts（hétáo, 核桃）

The Chinese have long believed that eating walnuts can sharpen the mind and boost concentration and memory. This stems from the fact that the crinkled appearance of a walnut resembles the folds of a human brain – and according to TCM principles, like replenishes like. TCM also considers walnuts as a warming food, which means they’re a great winter time snack. Walnuts are also chock full of goodness as well, including omega-3 fatty acids, vitamin E and folates – all of which aid the heart and brain.