Butter is high in saturated fat, which can increase LDL (bad) cholesterol levels and raise the risk of heart disease. In contrast, avocados are a good source of healthy fats, vitamins, and minerals, including potassium, magnesium, and fiber, which can benefit heart health. In addition to being a good source of healthy fats, avocado spread is also lower in calories than butter. One tablespoon of butter contains around 100 calories, while one tablespoon of avocado spread contains around 50-60 calories, depending on the recipe.