Death of the calorie economist.com - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from economist.com Daily Mail and Mail on Sunday newspapers.
Deliciosas en ensalada, las espinacas son una verde fuente de vitaminas.
¿Son fiables los valores del contenido calórico recogido en las etiquetas de los alimentos y/o en las bases de datos sobre valor nutricional? En pocas palabras: no demasiado.
Partamos de la base de que una caloría alimenticia (equivalente a 1 Kcal científica ) se define como la cantidad de energía necesaria para elevar 1ºC la temperatura de un litro de agua. Es decir que no es ni un nutriente ni una molécula que pueda ser asimilada por el organismo; es, simplemente, una unidad de medida. Así que, en realidad, afirmar que una manzana aporta 80 calorías es poco más o menos como afirmar que una manzana tiene un perímetro de 30 cm -y ahora es cuando haces la prueba con las piezas que tienes en la cocina-. Es decir, que
Calories on food packets are wrong – it s time to change that newscientist.com - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from newscientist.com Daily Mail and Mail on Sunday newspapers.
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Of all the paradoxes in the paradoxical field known as home economics, perhaps the most peculiar is the practice house, with its practice baby. Colleges and universities that offered home-ec majorsâand there were many in the twentieth century, including historically Black colleges, land-grant universities, and Ivy League institutionsâoften had a cottage or an apartment on campus where female home-ec students could keep house. Some of them were preparing for careers in education or industry, but most saw home ec as training for their inevitable futures as wives and mothers. Often, practice-house life entailed caring for practice babies, actual human ones, lent by adoption agencies, orphanages, or sometimes the mothers themselves. At Cornell University, the students called their first practice babyâborrowed in 1920, when he was three weeks oldâDicky Domecon, for âdomestic economy.â Couples looking to adopt were eager to get thei