胺基酸除了可以形成身體主要器官之結構（如肌肉、臟器等）之外，它還是啟動與關閉人體內許多化學反應與代謝功能（例如酵素反應、荷爾蒙分泌、腺體分泌、免疫調控、神經傳導甚至於情緒控制等）的控制器，身體的許多機能運作與活動都和氨基酸有密不可分的關係，由此可知胺基酸對人體的重要性。
"燃燒系胺基酸"是近來非常熱門的與脂肪代謝相關的胺基酸，相關產品在市面上琳瑯滿目，令消費者眼花瞭亂！其實具有脂肪代謝效果的胺基酸有：離胺酸Lysine、脯胺酸Proline、精胺酸Arginine。攝取此類胺基酸後，會活化體內的解脂酶(Lipase)而釋放出多量的遊離脂肪酸，或者是構成促進脂肪燃焼的荷爾蒙，此時配合有氧運動便可達到燃燒大量脂肪的效果。
為了提高代謝脂肪之效能，補充此類胺基酸之建議事項如後：
・最有效果的時機為在運動前30分鐘攝取與攝取後進行有氧運動。
・若空腹攝取則會迅速在體内吸收產生作用。
・VitaminＢ群有輔助其効果的作用，故可一同攝取以提高脂肪代謝之効果。
2010年5月24日 星期一
2010年1月21日 星期四
Essential Amino Acids
Dietary protein is the main source of amino acids. Amino acids can be used as fuel, but usually more important roles for them are as building blocks for proteins, and as a source of carbon and nitrogen for biosynthesis of other biochemicals.
In the process of digestion, proteins are broken down to free amino acids in the gastrointestinal tract. They are then absorbed and pass into the circulation, and are transported to liver where -NH2 groups are removed by transamination. The resulting alpha-keto acid is then used as fuel, or as a biosynthetic intermediate.
Amino acids are not stored in the body like fats or carbohydrate; there are no specialized cells in the body to maintain a reservoir. Of course, amino acids are ubiquitous, being present in structural proteins, enzymes, transport proteins, etc. Some of these proteins (notably serum albumin) can be degraded under conditions of fasting or starvation, to release free amino acids.
Adult humans are unable to synthesize all twenty amino acids needed for protein synthesis; those which cannot be synthesized and which must then be acquired via the diet are referred to as essential. The ten which the body can synthesize on its own are nonessential.
Essential amino acids are so called not because they are more important to life than the others, but because the body does not synthesize them, making it essential to include them in one's diet in order to obtain them.Eight amino acids are generally regarded as essential for humans: phenylalanine, valine, threonine, tryptophan, isoleucine, methionine, leucine, and lysine.
In the process of digestion, proteins are broken down to free amino acids in the gastrointestinal tract. They are then absorbed and pass into the circulation, and are transported to liver where -NH2 groups are removed by transamination. The resulting alpha-keto acid is then used as fuel, or as a biosynthetic intermediate.
Amino acids are not stored in the body like fats or carbohydrate; there are no specialized cells in the body to maintain a reservoir. Of course, amino acids are ubiquitous, being present in structural proteins, enzymes, transport proteins, etc. Some of these proteins (notably serum albumin) can be degraded under conditions of fasting or starvation, to release free amino acids.
Adult humans are unable to synthesize all twenty amino acids needed for protein synthesis; those which cannot be synthesized and which must then be acquired via the diet are referred to as essential. The ten which the body can synthesize on its own are nonessential.
Essential amino acids are so called not because they are more important to life than the others, but because the body does not synthesize them, making it essential to include them in one's diet in order to obtain them.Eight amino acids are generally regarded as essential for humans: phenylalanine, valine, threonine, tryptophan, isoleucine, methionine, leucine, and lysine.
Nonessential Amino Acids
Non essential amino acids are amino acids that can be produced in our body. Their uses and functions in our body are equally as important as the limiting amino acids. The difference is that those kind of amino acids can be found in our food.
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