WASHINGTON — The U.S. Department of Agriculture and the Department of Health and Human Services said they are soliciting written comments and oral testimony in advance of the second meeting of the Dietary Guidelines Advisory Committee scheduled for Jan. 29. The U.S.D.A. said the agenda will include presentations on the descriptive statistics on usual nutrient and food group intakes in the U.S. population and MyPyramid research updates. To submit comments visit www.DietaryGuidelines.gov.