- Avocados are heavy in fat, with 60% of it being monounsaturated fats, which may help to prevent heart disease and decrease blood pressure, according to a study. They're also high in potassium, folate, and fiber, all of which are good for the heart and circulatory system. Avocados are high in fiber, good fats, vitamin C, vitamin E, vitamin B6, potassium, magnesium, and folate, among other nutrients and it promotes gut health. Avocados are high in vitamin E, which may help prevent Alzheimer's disease and reduce the deterioration of your memory and cognitive abilities.