“Soy lo que como” is not only an entertainment program; it is also the result of a national campaign for viewers to learn how to lead a healthier life. The program's protagonists represent the groups with the worst eating habits in Spanish society. A doctor expert in nutrition, Yolanda Sánchez, lives with them for 48 hours to correct them and give them healthy guidelines as an alternative to their lifestyle.

They themselves will witness, thanks to a special morphing computer program, how they will look in a few years if they keep their current habits. A month later, the program returns to check if the protagonists have followed the doctor's advice and practice a healthier lifestyle.