[Cross-posted to Paleofood and Lowcarb-tech] I received a pleasant handwritten letter from Dr. Melvin Anchell today, which I quote in part below: Dear Dr. Moody, How Dr. Pennington determined which specific carbohydrates were correct for the meat diet, I do not know. From clinical experience, I do know that if *any* other carbohydrate is substituted--such as strawberries for raspberries, for example--weight loss stops and weight (fat) is gained even though the remainder of the diet is adhered to. I cannot explain the reasons for the latter phenomenon, but it has been repeatedly substantiated by clinical observations with everyday people in a real clinical setting. Nor have I found Pennington's explanation for the phenomenon. Though specific weight problems were a minuscule part of my medical practice, 50+ years of an intense, conscientious, close physician-patient practice involved 1,000s of such patients. There was never an exception to the fact that the diet must be followed 100%. ... Clinically, I find the original diet, if used permanently, is perfect for physical health. However, the need to relieve everyday mental stresses and strains with the pleasure derived from eating other foods may be overwhelming for many. To satisfy these needs and to excuse themselves, these people frequently find ways to rationalize and intellectualize their digressions. Not infrequently the physician is criticized for his lack of understanding regarding the physical deficiencies of the diet... Todd Moody [log in to unmask]