Step 1: Understand the role of proteins in the body.
Proteins are essential for maintaining osmotic balance in the body. Deficiency in proteins can lead to the accumulation of water in tissues, causing edema.
Step 2: Identify the effects of protein deficiency.
When there is a lack of proteins in the body, the osmotic pressure in blood decreases, causing fluid retention in the tissues, leading to water accumulation.
Step 3: Confirm the correct answer.
The correct answer is (1) Proteins, which are responsible for maintaining proper fluid balance.