Apples (Malus domestica) are the most widely consumed fruit in the world. There are over 7,500 apple varieties, and many are commonly eaten fresh or used in cooking and canning.

Diets high in apples may have several health benefits, such as a reduced risk of heart disease and several cancers. While all apples are nutritious, some stand out due to their high levels of antioxidants and nutrients.

The Red Delicious apple was once the most popular apple in the world. Its popularity has decreased over the last few decades as more flavorful apples, like Galas, hit grocery store shelves. Red Delicious apples have a mild flavor and an often mealy texture.

Red Delicious apples contain a high concentration of protective plant compounds. One study compared the phenolic content and antioxidant potential of five varieties of Australian-grown apples: Royal Gala, Pink Lady, Red Delicious, Fuji, and Smitten. Red Delicious had the highest total phenolic and flavonoid content and antioxidant potential.

Apples contain anti-inflammatory and antioxidant compounds, such as the flavonoids quercetin and chlorogenic acid. These compounds protect against cellular damage and inhibit the production of pro-inflammatory compounds, which may help lower disease risk.

Several studies have found that people with higher intakes of flavonoids, including quercetin, have lower rates of heart disease. Quercetin has antioxidant, anti-inflammatory, blood pressure- and blood lipid-lowering qualities and can protect against blood vessel dysfunction.