Based on my background knowledge I think it's false because of the fact that being hydrated reduces heat exhaustion, thirst and more! I don't think that it reduces the risk of injury though. Instead, you can reduce the risk of injury by doing simple things like drinking milk so you have strength and when you do get injured, your body will heal faster because milk makes your bones strong! And you can do things like wearing a helmet!
CDC’s Division of Laboratory Sciences released new data to the Fourth National Report on Human Exposure to Environmental Chemicals, an ongoing biomonitoring assessment of the U.S. population’s exposure to environmental chemicals
"Calcium is a mineral that people need to build and maintain strong bones and teeth. It is also very important for other physical functions, such as muscle control and blood circulation."
Many states/districts have put a uniform, or some kind of dress code in place to "prevent bullying". They think this helps so that way no one can be bullied for what they wear, as everyone is wearing the same, or similar things.
