In Colombia early in the twentieth century, a field of research began to take shape that looked at work and the physiology of diet, centered on the analogy of the human body as a heat engine that transforms energy. Starting with the energy unit of calories, foods were translated into the amount of fuel the body-machine needed for optimal performance depending on the work performed and environmental conditions. The main objective of this article is to highlight the role that this energy-centric conception of the body played in configuring a series of educational and public hygiene campaigns carried out in Colombia between 1890 and 1940. I argue that these social engineering actions, aimed at achieving the physiological regeneration of the population, formed part of the local eugenics movement, since the ideal of producing efficient working bodies was conceived of as a heritable characteristic that could improve future generations of workers. With this I highlight an unexplored aspect in the historical and local significance of the biological and its relationship to the way social problems of that time were understood. By historicizing both the social and the biological, I propose a research approach that contrasts with the usual distinction between the natural and the cultural present in some of the historiography on eugenics and race.

Artículos de investigación en Estudios Sociales de la Salud ¿Agresiones de la altura y degeneración fisiológica? La biografía del "clima" como objeto de investigación científica en Colombia durante el siglo xix e inicios del xx High-Altitude Aggressions and Physiological Degeneration? "Climate" Biography as an Object of Scientific Inquiry in Colombia during the 19 th Century and the Early 20 th Century Agressões da altura e degeneração fisiológica? A biografia do "clima" como objeto de pesquisa científica na Colômbia durante o século XIX e inícios do XX

Argument Using the notion of styles of knowledge we refer to the ways diverse scientific communities claim to produce true knowledge, their understandings regarding the attitudes and values that scientists should have in order to grasp natural and social reality, and the practices and technologies developed within such styles. This paper analyzes scientific and medical enterprises that explored the relationship between environment, population, and society in Colombia between 1850 and 1920. We argue that similar styles of knowledge production were shared in human geography, medical geography, and climatic physiology at the mid-nineteenth century; and that some physicians working in bacteriology and physiology since the 1880s established epistemic boundaries between their work and earlier scientific activities, while others found these distinctions irrelevant. However, the historical actors committed to any of the styles of knowledge production explored in this article agreed on the local specificity of their objects of inquiry, therefore questioning European science. These styles of knowledge production also shaped different ways of perceiving and addressing national problems. Hence, this article is a contribution to the recent literature on both historical epistemology and social and cultural history of science and medicine.

Resumen Este artículo analiza las lógicas, intereses y contingencias presentes en los intentos de expertos y legisladores por fomentar e higienizar el sistema lechero en la ciudad de Bogotá, entre 1938 y 1960. Estos esfuerzos se enmarcaron en una arquitectura institucional que iba de lo municipal a lo nacional, y en un contexto de creciente intervención del Estado en cuestiones nutricionales y de proyectos internacionales de cooperación técnica en salud. A pesar del fracaso en mejorar la calidad de la leche y aumentar su consumo, este estudio de caso nos muestra los efectos de una legislación poco adaptada a las circunstancias locales en la infraestructura material del sistema y los intereses comerciales detrás de las normativas de calidad del producto.

At the beginning of the 19th century, Colombian physicians thought of food as an essential factor in shaping human character and corporeality. Framed in a neo-Hippocratic system, health and racial differences were related not only to climate but also to the connection between food qualities and humoral fluids. For example, it was believed that the tendency to eat cold and moist food, as well as greasy substances, was one of the reasons why people in warm regions of Colombia were choleric, phlegmatic, and indolent. By midcentury, it was further argued that each regional type—a local racialized categorization based on geographic determinism—had certain diet habits and physiological characteristics that explained its character (sober, obedient, lazy, industrious, etc.), and that made this type “naturally” suitable for different kinds of work. During this period, the working population’s diet was not perceived to be a social problem requiring regulation, at least not by the government. In the midst of liberal reforms, the political elites were more focused on the economic and genetic integration (“whitening”) of highland Indians, and to a lesser extent blacks, than on producing a supposed “better race” through nourishment. But by the late 19th and the early 20th centuries, however, a new cultural framework that crossed the boundaries of thermodynamics, political economy, experimental physiology, and eugenics had begun to emerge in Colombia, converging in the social problem of nutrition. Centered on the analogy of the human body as a heat engine that transforms energy, local scientists began to conduct surveys of the eating habits of the “working classes,” analyses of the chemical and caloric composition of their foods, and studies on the metabolic characteristics of different regional populations. The results of these investigations were used to push the government to “restore the energies” of an impoverished population that was consistently thought to be weak and racially inferior, but capable of physiological and hereditable improvement. The cry of conservative elites for political and moral “regeneration” at the turn of the century also had a biological component—the optimization of the human motor. In the 1920s and 1930s, several campaigns and institutions were created for this social engineering, aimed at producing a modern, healthy, and industrious citizen. These campaigns gained special political force after the Liberal Party returned to power in 1930.