The fifth class for community nutrition

In that class, we learned something about how is food security measured. They have a guide to measuring household food security, and need do a lot of survey. They would ask a lot of questions such as during the past 12 months, you (and others) worried that food would run out before you got money to buy more, is it often true, or sometimes true, or never true. A lot of similar questions. I don't know, are these questions quite give a real situation to the government? The people could lie, in my opinion, if I was in this situation, it must be embarrass to let other people know that.