Several weeks ago, more than 70 American students discussed with American First Lady Michelle Obama at the White House about health problems. The students asked lots of questions that day and Mrs Obama answered them one by one patiently. Then Mrs Obama explained the importance of making healthy choices  . _  She told the students that she didn't always feel good about the choices her family was making. Some years ago, when she was working and living with her family in Chicago, Mrs Obama realized she had to make changes in her family's lifestyle. "We were eating out too much, buying a lot of things, and drinking a lot of sugary drinks," she said. So Mrs Obama started talking to her kids about eating healthily and exercising more. Soon they were cooking more, eating fewer desserts, and spending less time watching TV. Mrs Obama realized that making little changes can have a big effect .  Mrs Obama said that young people should take care of their own health and their own futures. "Exercise isn't always about sports. It's just about moving," she said. From the passage we know   _   .
the students are in poor health as a child , Mrs Obama was poor in health Mrs Obama's children have health problems Mrs Obama cares for children's health very much