Generalized edema in arms, legs, and periorbital regions can be influenced by diet. Which dietary pattern could contribute to edema?

• A. A diet high in sodium.
• B. A diet low in protein.
• C. A diet high in sugar.
• D. A diet high in fat.

Answer: (B)

Low protein intake can lead to hypoalbuminemia, which lowers the plasma oncotic pressure that normally keeps fluid inside the blood vessels. When oncotic pressure drops, fluid leaks into the interstitial spaces, producing generalized edema in areas like the arms, legs, and around the eyes. This pattern is classic for edema driven by insufficient protein, such as in malnutrition or liver disease, where albumin production is impaired.

Diets very high in sodium can cause fluid retention and edema too, but that usually reflects volume overload rather than a drop in oncotic pressure from low protein. Diets high in sugar or fat don’t typically produce generalized edema through oncotic mechanisms.