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Man was designed to consume much more fiber than we get in modern diets. Fiber slows our digestion and thereby helps prevent swings in our sugar and insulin levels. Both hot and cold breakfast cereals can be excellent sources of fiber; choose ones with a fiber content in the 6 gram or higher range. Hot oatmeal cereals are excellent but only those that are slow cooked; instant hot cereals have too high glycemic indices. And don't be fooled by cereals labeled "naturaL" Many types, including granola, have plenty of sugar and minimal fiber.

Even worse, they may have hydrogenated oils. Donuts are the worst breakfast choice. They have high levels of trans fats and highly processed flour with a very high glycemic index. Avoid store-bought muffins as well, because they are usually loaded with sugars.