Peptide-Based Tube Feeding Healed Surgical Wounds 30% Stronger Than Amino Acid Diets

Prospective randomized study in 38 male Sprague-Dawley rats. After standardized abdominal wounds, 20 rats were randomized to isonitrogenous (equal protein) peptide-based vs. amino acid-based diets for 10 days. An additional 18 rats were randomized to amino acid diets supplemented with either carnosine or its constituent amino acids. Diets were delivered via small bowel feeding tubes. Wound strength was measured as bursting pressure.

Hospital patients recovering from surgery are often fed through tubes with nutritional formulas. Most formulas use free amino acids rather than peptides because they're easier to manufacture. This study shows that's a mistake — peptides, especially carnosine, actively promote wound healing in a way that amino acids alone cannot. Since carnosine is absent from most enteral formulas, adding it could be a simple, low-cost way to improve surgical recovery.

This 1998 study was ahead of its time in demonstrating that dietary peptides have bioactive effects beyond simple nutrition. The finding that carnosine — a naturally occurring dipeptide found in meat — promotes wound healing when administered enterally helped establish the concept that peptides in food are not just protein fragments but biologically active molecules with specific therapeutic functions.

This is a rat study and results may not directly translate to human surgical recovery. The sample sizes are small (20 in the first experiment, 18 in the second). Only one wound type (abdominal) and one time point (10 days) were tested. The abstract doesn't report on wound infection rates, collagen content, or other wound healing parameters beyond bursting pressure.