Here's why:

* Muscle cells (myocytes) are primarily composed of proteins, particularly actin and myosin, which are responsible for muscle contraction. Muscle growth (hypertrophy) involves an increase in the size and number of these protein fibers.

* Fat cells (adipocytes) primarily store lipids (fats). While they do contain some proteins, their primary function is energy storage, not protein synthesis.

Therefore, muscle cells synthesize significantly more proteins than fat cells to support their growth and function.