If you haven’t figured out by now that English muffins are not Paleo, I hate to be the one to break it to you, but it’s true. They are a type of bread, consisting mainly of flour, shortening, milk, sugar, yeast, and cornmeal, none of which are Paleo (except maybe milk, if it’s whole and organic).
The Problems With Wheat
The wheat is not Paleo-friendly for obvious reasons. It is highly processed and very high in carbohydrates, without containing many nutrients. Flour is as effective as sugar in raising blood sugar. A rise in blood sugar leads to a rise in insulin, a hormone that shuttles nutrients into fat storage and prevents the body from accessing nutrients already stored in fat cells. Chronically high blood sugar leads to inflammation and insulin resistance, which is linked to all sorts of diseases, most notably diabetes and Alzheimer’s.
Paleo and Grains
Cornmeal may seem harmless enough, but it has a lot of the same problems that flour has. It comes from a grain (not a vegetable) and although that grain is gluten-free, it is still very starchy and does not contain a significant number of nutrients.
Mark Sisson has a whole list of non-Paleo foods to avoid and excellent reasons why they should be avoided.