Alveolar macrophages (AM), which are enhanced by GM-SCF, are an essential piece of the innate immune response and are known to contribute to host defense against flu infections in animal models.
The discovery adds another piece to the growing body of evidence that humans, much like the rest of the animal kingdom, know more from their noses than previously thought.
Since it takes about 700 calories' worth of animal feed to produce a 100-calorie piece of beef, this change in diet increases the overall demand for grains.