The Bible has a lot to say about the effect your words have on you. And one effect your words have on you is they have an effect on your body. In James 3:2-4 the Bible says some amazing things about the effect your words have on your body. In verse 3 it talks about how we put bits in a horse's mouth to control his body, he's making a comparison of the bit to your tongue. So, he's saying your tongue can be used to control the body like a bit in a horse's mouth controls his body, it controls the direction he goes. And in verse 4 it talks about how a ship is controlled by a very small helm wherever the governor listeth inspite of fierce winds. In that verse you are the governor, your tongue in the helm, the ship is your body, and the fierce winds are anything that comes against your body. Notice, you are in control of your ship by your tongue.
Understand your body is a vehical for your spirit, it's how you make contact with this physical world, but the body is not the real you. The real you is a spirit that God has given authority over your body. If you look in Genesis chapter 1:26-28 you see that God gave man dominion over all the earth which includes your body. Because in Genesis 2:7 it says that God formed man's body out of the dust of the earth. God has given you(spirit you) authority over your body, but you have to take authority and stay in authority. That's why in 1Corinthians 9:27 Paul says, "But I keep under my body, and bring it into subjection." He could only do that because God had already given him dominion over his flesh. So, by faith take authority over your flesh and stay in authority over your flesh with your words