View all show notes and timestamps on the KoopCast website. Episode overview: Luc van Loon is a Professor of Physiology of Exercise and Nutrition and Head of the M3-research group at the Department of Human Biology at Maastricht University. Luc has an international research standing in the area of skeletal muscle metabolism and has published well over 475 peer-reviewed articles. Current research in his laboratory focuses on the skeletal muscle adaptive response to physical activity, and the impact of nutritional and pharmacological interventions to modulate metabolism in both health and disease. Episode highlights: (22:50) Results of collagen research: collagen stimulates neither connective nor contractile proteins in muscle, potential explanations, the benefits of collagen are not confirmed, areas for future research (42:35) Dietary protein intake: athletes who exercise more consume more food, thus their protein and amino acid intake per kg body mass is already high, recap (45:57) Sources of collagen: collagen from skin sources are superior, dangers of concentrating heavy metals in bone broth, example of athlete consuming arsenic from salt Additional resources: SUBSCRIBE to Research Essentials for Ultrarunning Buy Training Essentials for Ultrarunning on Amazon or Audible. Information on coaching-https://www.trainright.com Koop’s Social Media: Twitter/Instagram- @jasonkoop