The study analyzes data from the INTERMAP study, an international, cooperative, 17-sample population study of 4,706 men and women ages 40-59 in the United States, the United Kingdom, China, and Japan. It will provide the largest amount of data available on the patterns of urinary amino acid excretion. It will also make it possible to determine if the excretion of specific amino acids are related to the intake of dietary protein from specific food sources. Furthermore, it will provide the ability to test the hypotheses that intake of dietary protein is related to levels of both systolic and diastolic blood pressure. These hypotheses are strongly held in Japan, one of the countries participating in the INTERMAP study, and have only been investigated to a limited degree in the United States and Europe.