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Modern people are regularly informed about the dangers of leading unhealthy lifestyles. Despite the spectacular advances in the medical field, many people are still suffering from and being killed by diseases, most of which are preventable.

There are some reasons why there is still a prevalent habit of doing unhealthy activities. This can be, firstly, explained by the fact that most people are prone to undue optimism. Although powerful and constant reminders of what unsound lifestyles can bring is readily available everywhere, people still keep the faith that they would hardly be inflicted. Even for those who are aware, they are often in denial and convince themselves that unhealthy habits are not as terrible as the media want them to believe. Secondly, once people are addicted to unhealthy habits, it is very difficult for them to break. For example, people with smoking habits cannot reduce their dependency on cigarettes due to its high addictiveness, or people with sedentary lifestyles are unable to bring themselves to be more active on the simple grounds that exercises are not pleasurable