Dietary assessment
Dietary data were collected using 7days 24-hour dietary recall through face-to-face interview. They were asked to recall all foods and beverages consumed during the 7 days ago. Portion-sizes of consumed foods were converted to gram. Then each food and beverage was analyzed for their energy and nutrients especially sulfur-containing amino acid (methionine, cysteine) content using Nutritionist IV (version 7.0; N-Squared Computing, Salem, OR). Software program modified for Iranian foods. The software database drawn from United States Department of Agriculture (USDA) food composition tables. Total energy intake between 800-4000 kcal was accepted.