Every Friday at the new Boston Public Market, LDEI Boston President Louisa Kasdon features a speaker at her weekly Let's Talk about Food Brown Bag Lunch.

This week, Kathy McManus, Director of the Department of Nutrition and the Nutrition and Behavior Modification Programs for the Program for Weight Management at Brigham and Women’s Hospital will speak on whether diets ever really work.

What does this top Harvard nutritionist think about the current roster of popular diets? Is any, one diet more successful than the others? What does work for weight loss? What works best for health?