It's not that it will affect YOUR performance, but it can affect others. For example. Basketball. You gaurd using your hands, if you are wearing, lets say... earings, your defender, could get cut by the back of your earings. Or your earring could fall out in the middle of a game and someone slips on the back. Many possibilities. If my answer isn't in enough detail, ask a refferee or a coach. I play MANY sports, but I am no expert on jewelry. Haha.
if we eat carbohydrates most gives us energy and affect the sports performance
It can affect your sport's performance by the characteristics you have that affect play.
It is not good for you.
wearing proper sports clothes will highly affect your sporting ability... this will help you in lots of different ways aswell as stop you from swearing this will also help you not to conceed sweaty goals on FIFA!
Your preformance improves
if you concentrate and don't swap mosquitoes you can do sports faster
Harder to breathe.
it makes u drouzy