Edema appears when there is a severe lack of dietary protein because

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Edema occurs when there is a lower concentration of proteins in the blood, which causes fluid to shift into the tissues. This happens because without enough protein in the blood, there is less osmotic pressure to draw fluid back into the blood vessels. As a result, the fluid remains in the tissues and causes swelling. Sodium retention may also play a role in edema, but it is not the primary cause. Increased protein synthesis in tissues would not cause fluid to flow from the blood into the tissues.

Edema Appears When There Is a Severe Lack of Dietary