Here is a great review and publication about protein intake for athletes.

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5477153/

I would say that most kids that are constantly injured are either under-recovered or did not prepare properly for their sport. For male athletes between the ages of 12-14 they are more susceptible for injury due to puperty this is why it is highly recommend that they participate in a injury prevention/strenght training program to help with strengthening of the core, muscles, tendons/ligaments etc. it is very important for the physical development and the demand that they put on their bodies from so much practice and games.

I am a phd student in human and sports performance and work with a lot of soccer players at my gym..I would suggest taking the summer off from playing soccer and focus on building physical qualities of the game this will for sure reduce the likely hood of injuries as long as you work with a professional that understand how to properly program for an athlete age.

check out [/url]https://www.metabolismbasedeating.com/[url].. stephanie is great!