Protein Energy
Sep/100
How much energy required to synthsise 1 gm protein?
To synthesize protein, energy is required for gene activation, translation, transcription, processing of intermediates and synthesis of raw materials and enzymes and catalysts also heat loss during the synthesis and waste processing, Hence 1gm protein shall not be equal to 4 calories in terms of synthesizing in the body.
That's a very tough question to answer, because you're absolutely right about all of the processes that go in to making a protein. Also, you have to consider that much of the protein we consume is structural, but that there are millions of different kinds of proteins that compose that tissue. In addition, different species probably make very similar proteins more/less efficiently than other species.
Although we may never be able to accurately estimate the energetic costs of producing a particular amount of protein, we *can* estimate the basic energy needs for our body to grow and maintain homeostasis.
Let's say that you consume 2000 Calories (kcals) per day. If consumed as heat (directly), this is enough energy to boil about 40 liters of water. Fortunately, the body carefully converts this energy into a chemical energy it can use (ATP) which fuels the processes that keeps our bodies functioning. One of those processes is transporting, building, and breaking down proteins.
The 4kcal/g of protein that you consume is based on an industry standard determined by combusting an "average" gram of protein. The same holds true with 4kcal/g avg. carbohydrate and 9kcal/g avg. fat.
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