What are the effects of oatmeal, walnuts, extra virgin olive oil, and avocados on LDL cholesterol size?  When a headline reads “Avocados could improve your cholesterol—and more,” the article and others like it are largely talking about substitution experiments, where avocado is added to the diet as a replacement for animal fats. In that case, it’s no wonder cholesterol goes down. Dairy and poultry are the two greatest