I often wonder about these interpretations of blood tests. There are some cultures that live solely on protein (well, protein and fats). I remember watching on National Geographic where this Arctic (or was it Antarctic) tribe just spends their lives following around the caribou. Everything they have comes from this animal. Their clothes, tents, candles, food... everything. There's just nothing else in that arctic wasteland. The meat I assume is pretty lean. But lets just say it's 30% fat. If they are eating 400 grams of meat a day 280 grams at 1,120 calories will come from protein and 120 grams at 1,080 calories will come from fats. This will give them about 2,200 calories a day. But chances are they need a lot more because of the extremely cold weather and that they are always moving.
Remember, your body, if necessary, does not need carbs to survive. Amino acids can be converted to glucose for energy but carbs can't be converted to amino acids which is second only to water as far as what your body is composed of.