Cómo los alimentos ultraprocesados afectan el peso corporal, la salud intestinal y el riesgo de enfermedades
La investigación sugiere que los alimentos ultraprocesados pueden impulsar el consumo excesivo, desplazar la fibra y aumentar el riesgo de enfermedades a través de mecanismos que van mucho más allá de su contenido en grasas, sal y azúcar. Comprender esos mecanismos, en lugar de aplicar una evitación generalizada, ofrece un camino más práctico a seguir.
Creado con IALos alimentos ultraprocesados dominan ahora el suministro de alimentos en muchos países de ingresos altos, aunque la ciencia que explica con precisión por qué parecen perjudiciales todavía está siendo construida. La pregunta importa porque la respuesta determina todo, desde las elecciones alimentarias individuales hasta la política de salud pública, y porque la categoría en sí misma dista mucho de ser uniforme, abarcando desde bebidas azucaradas hasta leches vegetales fortificadas y todo lo que hay en medio.
Creado con IAEl ensayo controlado que reencuadró el debate
Gran parte de la evidencia fundamental proviene de un ensayo controlado aleatorizado descrito por el investigador Kevin Hall en The Proof with Simon Hill. A los participantes se les proporcionaron comidas igualadas en calorías, macronutrientes, azúcar, sodio, fibra y densidad energética general, y se les indicó que comieran tanto o tan poco como quisieran. No se les informó de que se estaba midiendo la ingesta calórica. Al vivir en el entorno de alimentos ultraprocesados, los participantes consumieron espontáneamente aproximadamente 500 calorías más por día en comparación con cuando se encontraban en el entorno de alimentos mínimamente procesados. Ganaron peso en una condición y lo perdieron en la otra, sin ningún cambio consciente en su intención.
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