Are all calories equal?

Are all calories equal? Thermodynamics would say that energy is energy, be it derived from carbohydrate, fat, or protein. But things get more complicated when appetite is taken into consideration , says Robert Lustig, professor of pediatric endocrinology at the University of California, San Francisco. Also this week, life expectancy in Europe is increasing, but at the same time health inequalities are widening. Claudia Stein, director of the Division of Information, Evidence, Research, and Innovation at the World Health Organization's regional office for Europe, talks about a new report that highlights both the good and the bad of Europe's health.