As our first choice for animal protein, meat is trusted for its high iron and also vitamin B12 content. It is also rich in bad fats and pro-inflammatory substances, residues, and and toxic contaminants. Despite media coverage of health scandals and the link established by the WHO between cancer and processed meat, our eating behaviours tend towards bad old habits. But statistical studies on the environmental, epidemiological, and toxicological impact of meat can change our perception of this food. Science helps us to understand the relation between diseases and excessive meat consumption and diseases, enabling informed preventive measures founded on transforming our eating behaviors.