Dennis Wilson Is a 57-Year-Old Chemical Engineer Who Has Had

Dennis Wilson is a 57-year-old chemical engineer who has had type 1 diabetes since he was 12 years old. He spent 34 years working in oil refineries, and he is a smoker. He is 5'11" tall and weighs 160 pounds. Over the past several years, he has experienced a gradual decline in kidney function. His GFR has declined to 27 mL/min per 1.73 m².
Protein intake for Mr. Wilson should:

A) be restricted due to slow disease progression.
B) be increased due to PEM.
C) be limited to plant protein foods.
D) be limited to animal protein foods.
E) remain the same until he begins to lose weight.