Stress is a very normal part of life. Most people feel stress at some time __ _11__ . It doesn't come from an event itself, that is, from the things that are __12__ in our lives. It comes from the meaning we give to what has happened. We can experience stress any time we feel we don't have __13___. It can't come from a feeling that we can do anything about a situation. Stress is not just caused by our mental or emotional condition. It is also influenced by how tired we are, whether we have a ____14____ diet with enough vitamins and mineral, whether we get enough physical exercise and whether we can ____15_____.