The knowledge of university students regarding the use of toxic substances, daily and eating habits with a carcinogenic character was assessed by using a semi-structured questionnaire. In addition, a systematic review was carried out on an electronic basis on the subject. The results revealed that university students know little about the risks and association of high consumption of hyperglycemic foods, omega-6 and red meat, as well as the exposure to BPA and insecticides, despite the fact that most are aware of the harmful effects of excessive use of cell phones and its relation with cancer. Thus, we notice the importance of disseminating preventive information that promotes a change in living and eating habits with carcinogenic character, resulting in self-care and a better quality of life.