The phrase "certain foods" refers to specific types or categories of edible items that are considered beneficial for one's health, well-being and overall dietary needs. These could include fruits, vegetables, whole grains, lean proteins, low-fat dairy products, nuts, seeds, legumes, fish, etc., which are known to provide essential nutrients such as vitamins, minerals, fiber and antioxidants that help prevent chronic diseases like heart disease, diabetes or obesity. The phrase is often used in the context of a balanced dietary advice where experts recommend consuming "certain foods" to maintain good health while avoiding others known to be high in unhealthy fats, sugars and salt that can lead to negative health outcomes if consumed excessively.