It's highly improbable that your heartburn was caused by the fat in a single avocado. An average Hass fruit weighs 140g and thus contains about 23g of fat, and

It's highly improbable that your heartburn was caused by the fat in a single avocado. An average Hass fruit weighs 140g and thus contains about 23g of fat, and most of this is unsaturated. You'd consume about the same amount of fat if you'd eat a single slice of bread with butter and cheese.