The relationship between the food consumed daily and its impact on the environment is extremely close, even more when it is obtained either from animal or plant sources. This analysis aimed to assess the carbon footprint of different diets and subdiets belonging to the omnivorous and vegan diets that have emerged recently, such as the plant-based diet, the conventional vegan diet, the Mediterranean diet, and the average Chilean diet, to determine their Greenhouse Gas emissions (GHGE), through the equivalent mass of CO2 (kg CO2e) produced throughout the life cycle of each product belonging to each of these diets. From the proposition of nutritional minutes of equal caloric content for each of these diets, it was possible to quantify the GHGE, thanks to the values obtained through different programs and bibliographic reviews on the subject. It was concluded that at equal caloric and nutritional value, the plant-based subdiet was the one that clearly generated the lowest carbon footprint, due to the preference of plant over animal products in the diet minute. The Chilean average subdiet showed the higher CHGE, about 160 % greater than the plant-based subdiet.