A healthy diet, as reflected by AHEI-2010 score, is rich in vegetables, fruits, whole grains, nuts, legumes, omega-3 fats, and polyunsaturated fatty acids, and is light on sugar-sweetened drinks, red and processed meat, trans fat, and sodium-rich products. It is also characterized by low alcohol intake. In the current study, low alcohol intake was a "key component" associated with larger hippocampus volume, the researchers say.
"Our findings lend support for the hypothesis that overall diet may affect brain structures with a specific impact on hippocampus volume," the researchers conclude. "Accounting for the importance of hippocampus with long-term, declarative, episodic memory, as well as for flexible cognition network, our findings reaffirm the need to recognize diet and nutrition as potential determinants of cognition, mental health and social behavior."