New research shows that breast size may indicate overall health, with larger breasts often found in countries where obesity is a problem. According to World Data, the largest breasts are found in Norway, Iceland, the United Kingdom, and the USA, while smaller breast sizes are common in Central Africa and Southeast Asia. The female breast consists largely of fatty tissue and glands, meaning that body fat contributes to cup size. Women in African and Asian nations may have smaller breasts due to their smaller body size and weight. Denmark is the only country in the top 20 to have a healthy BMI.