Marketing of unhealthy food is being increasingly discussed in the contemporary time. Although there is growing consumer awareness of the harmfulness of this food, consumption of the same in the world is constantly increasing. That is a result of the aggressive and manipulative marketing that supports development of unhealthy food industry. Among the many examples of such practices, which among the other things neglect the ethical business principles, it is possible to distinguish world brands such as Coca-Cola and McDonald's. The marketing of these companies is very similar and the inevitability is most prominent in the promotion and price domain. Some modern instruments are being co-ordinated as a result of the dynamic development of technology and software solutions. The success of these companies without the proper marketing and effective marketing strategy would be unmanageable. Consequently, overall business, all important strategic decisions as well as the future development are based on marketing as a key process.