Depending on how you've eaten steak before you went Paleo. Was it chopped and wrapped in something? SAD not only has nutritional ramifications, psychological as well (i.e., only feeling full afyter eating out of a box, bag or sack).

Sometimes if I eat a meal of just meat, I will feel a bit noshy afterwards, even if I eat a lot. Though I can probably say the same thing about any meal consisting of just one food item.

My guess is that I am getting incomplete nutrition in the meal and my body is looking for something else, some vitamins or minerals or perhaps enzymes that are missing from the meal, but which you get when eating a side dish or a combination of foods. It is probably not a coincidence that virtually every meal prepared anywhere in the world is made up of a combination of foods.

You did not say how you like your steak done, but if it is on the well done side, you are missing out on a bunch of nutrients, and some people find well-done meat hard to digest, which may leave you feeling unsatisfied afterwards.

As others have said, if you eat too big portions you get an insulin response. This has been called the chinese restaurant effect, and theres an article on it here.

!)Your steak is too big. 2)It causes an influx of insulin..3)insulin will not allow your body to burn it's own fat for fuel, 4)so when your muscles want food..the excess insulin is hanging around from the too big piece of steak you ate 5) your muscles can't get fed because insulin is a FAT storage hormone and will not let your fat out so you can use it...6) But your muscles are still needing energy, so they send a message that you need to eat.&) you get hungry.

Eat smaller pieces of meat every few hours..just cut it down to 4 to 6 oz... and eat the rest a few hours later.

I know..I am insulin resistant. This is my life. Gary Taubes has it down cold. I am no longer hungry. I have lost 25 pounds. As soon as I feel hunger, especially after eating, I know I have eaten too many carbs or too much meat. I wish they made insulin meters that would measure insulin in the blood stream like there are glucometers..that measure the blood sugar.

What kind of steak are you eating? If it is an overly lean cut (such as a filet or lean sirloin) you could be putting down a lot of protein and not a whole lot of fat.

Protein, especially in excess (14-18oz would qualify) can stimulate insulin release via gluconeogenesis (the synthesis of glucose from glucogenic amino acids) and may explain why you get hungry so quickly after feeding.

Because of this, the seemingly paradoxical phenomenon of eating less and feeling more satisfied is possible.