A growing body of research suggests that there are some foods that are especially good for your brain; some studies even suggest they may help stave-off mental diseases like Alzheimer's.
These foods fall into 10 categories that are all part of plant-based diets. Some categories include: green leafy vegetables, nuts, berries, fish, beans, whole grains, and olive oil.
One 2015 study that investigated 3 different diets among a group of 923 participants aged from 58-98 suggested that one type of plant-based diet, called the MIND diet, helped reduce the risk of Alzheimer's by 54%. It's important to note, however, that the study was observational, so it demonstrated a link between the diet and the disease but not necessarily a causative effect.