The trend in food today, both for reasons of health and to look for a slender figure, is to bet more and more on the organic, the natural, the garden: vegetables, vegetables, legumes, fruits … but there are those who wear more styles strict that others, and strongly reject the use of animal meat and any product that comes from it. This style of eating, known as veganism and patented by Donald Watson in 1944 with the aim of differentiating normal vegetarianism, which does not include meats, and total or strict vegetarianism, which does not even admit meats, but neither products that come from animals, which is veganism. Opinions found. On this type of diet or eating style, there are multiple opinions, both for and against. Those who choose it often not only have to face the disadvantages that this practice entails, but also the disadvantages at the social and even, often, family level. Disadvantages of vegan diets. Among the disadvantages of eating a vegan diet are fundamentally the exclusion of all types of meats and products of animal origin, such as eggs, milk, cheese, butter, as this could trigger some type of risk to the body. It is well known that the body requires vitamins B12 group for proper functioning, as well as iron and zinc, whose lack is necessary to supply. The UN in favor of veganism style. A report by the United Nations (UN) states that “a vegan diet would save the world from hunger.” In this report published in “The Guardian,” he notes, “A global shift towards a vegan diet is vital to saving the world from starvation, fuel shortages and the worst impacts of climate change.” In that same sense, the report continues: “The production of meat and dairy products represents 70% of the world’s freshwater consumption, 38% of the total use of the land and 19% of the global emissions of greenhouse gases. ” Also, in the opinion of the United Nations Environment Program (UNEP), by the year 2050 the world population will increase to 9.1 billion people, which means that diets high in meat and dairy products would become unsustainable. On the vegan diet, the president of the Spanish Society of Dietetics and Food Sciences in declaration to the BBC World said that “it is a complicated diet; Those who decide to carry it must have enough knowledge, since it eliminates a group of very important foods, such as those of animal origin.