A friend of this blog writes:
What prompted me to try SLD: When I first went paleo I dropped 30 pounds with no exercise or food restriction, but my weight has been stable for about a year. In January and February  I went through a bad allergy spell, with my nose congested all the time. I dropped six pounds in that time. When the seasonal allergy went away, the weight came right back. Calories without smell suddenly look like a big factor.
Here is a paper about the theory behind the Shangri-La Diet.