Why Does Poultry Have Both Light and Dark Meat?
While the distinction may just be a question of taste to you, to the bird, it may help them flee the coop.
You may wonder how one animal can taste so differently depending on the body section the next time you have a turkey meal. The turkey and other birds need two distinct kinds of muscle: strength muscle and endurance muscle, which explains this oddity.
The endurance or "slow twitch" muscle is found in dark meat. Dark flesh is seen in the legs and thighs because turkeys spend most of their time on their feet and seldom fly.
Myoglobin, a pigmented protein that carries oxygen in your blood and is comparable to hemoglobin, is what gives it its dark hue. Myoglobin attracts oxygen more strongly than hemoglobin, allowing slow-twitch cells to "steal" oxygen from the circulation and utilize it to burn energy. Because fatty acids are slow-burning energy sources, they are principally responsible for the moistness and tenderness of dark meat.
Strength or "rapid twitch" muscle, on the other hand, is light flesh. Considering that turkeys can only fly a short distance, you may discover it in the bird's breast and wings.
Due to the fact that a brief sprint uses no more oxygen than is already present in the tissue, fast twitch muscle does not need myoglobin to get oxygen. Because of this, sprinters like Usain Bolt are not out of breath after the 100-meter dash. Since the aerobic (oxygen-burning) technique of producing energy is an effective but slow procedure, they power their muscles with almost little oxygen. Light meat is dry and flaky because these muscle cells need energy FAST and acquire it from blood sugar rather than fat.
So why don't the muscles of the other animals we consume have different colors? In fact, they do. Because they are either combined or because the animal predominantly uses one kind of muscle, the two muscle types could not be as strongly contrasted as in a turkey. Consider meat; have you ever seen a cow sprinting?
Cows spend their whole day standing still and don't need muscles for running, therefore they are virtually completely composed of dark, "slow-twitch" muscle. Similar to the slow-twitch muscles of turkeys, beef is high in fat, allowing for continuous energy expenditure throughout the day.
