Minced beef is more rapidly digested and absorbed than beef steak, resulting in greater postprandial protein retention in older men.
Level 2 - randomized trial
Randomized crossover trial in humans
PubMed 23636241 · doi:10.3945/ajcn.112.051201
What was done
Ten older men (mean ± SEM age: 74 ± 2 years) completed a randomized crossover trial comparing the consumption of 135 g of intrinsically L-[1-13C]phenylalanine-labeled beef prepared as beef steak or minced beef. The interventions were combined with continuous intravenous infusions of L-[ring-2H5]phenylalanine and L-[ring-2H2]tyrosine to measure protein digestion and absorption kinetics, whole-body protein balance, and skeletal muscle protein synthesis rates over a 6-hour postprandial period.
What was found
Meat protein-derived phenylalanine appeared faster in the circulation after minced beef than after beef steak consumption (P < 0.05). Postprandial availability in circulation over 6 hours was higher after minced beef than beef steak (61 ± 3% vs 49 ± 3%, P < 0.01). Whole-body protein balance was more positive after minced beef than beef steak (29 ± 2 vs 19 ± 3 μmol phenylalanine/kg, P < 0.01). Skeletal muscle protein synthesis rates showed no significant difference between treatments over the 6-hour period.
Why it matters
Mincing meat enhances protein digestion kinetics, amino acid availability, and whole-body protein retention in older adults, offering a practical dietary strategy for individuals with reduced chewing efficiency.
Limits
The study had a small sample size (n = 10) and included only older men, limiting generalizability to women and other age groups. It examined only a single-meal acute 6-hour postprandial response without assessing chronic adaptations in muscle mass or long-term nitrogen balance.
Cited by
- supports Minced meat is digested and absorbed significantly faster than intact steak.