Rookie Mormon

Will drinking energy drinks and caffeinated soda keep Mormons from being able to go to the temple?

Anything that defiles our bodies (hurts them, makes it harder for them to feel the spirit of God) pushes us farther away from God. The temple is a place where those who are close to God can go to feel closer to him. Mormons also think of their bodies as temples. If we are filling our bodies with chemicals that may harm us, our Bishop may wonder why we are doing so, and ask us what the temple means to us, or why we feel that we are ready to attend the temple. 

There is a great article on energy drinks called: Energy Drinks: The Lift that Lets You Down.