Calorie shifting: Is there any validity to the claims made by its proponents?—What-Is-It-Exactly?&id=640971

Can you ‘trick’ your metabolism into not entering starvation mode? There is a lot of info out there, but the majority of it is coming from sites that I suspect have something to sell, or from sites that have copy/pasted from sites with something to sell. How valid is ‘starvation mode’ as a diet killer anyways?