There are quite a few things which happen to our bodies when we lie and we might not even be aware of them.
We have all lied at some point or the other in our lives and if you meet someone who claims that they haven't, they are probably lying. The fact is that, if you remove the moral aspect, lying becomes a response similar to any other response from our side.
There are, however, certain things which happen in our bodies when we lie. Everything from our brains to our memories and our bodily postures changes. Our minds are aware of the fact that we have lied and this creates a small stress as the mind takes time to reconcile it with the truth.
The frontal lobe or the front side of our brains are responsible for our cognitive abilities like thinking, rationalizing etc. This is the part of the brain which is most involved in reasoning and understanding and thereby plays an important role in our thought process.
When we lie, the frontal lobe gets activated immediately. This happens because, in order to lie, one has to suppress the truth and do it in a way which does not arouse suspicion. The frontal lobe, therefore, helps suppress the truth and create the lie, which we then utter.
According to Wikipedia, 'the limbic system supports a variety of functions including emotion, behavior, motivation, long-term memory, and olfaction.' What it means is that the limbic system manages the emotional fallout and the memory changes associated with the lie.
When we lie, then, our limbic system comes into play. The emotions which are generated by lying, and the memory of the real events, as well as that of the lies, needs to be tackled by the mind in order to keep functioning properly. Needless to say, the limbic system responds immediately.
The temporal lobe is the part of the brain which lies at the back of our heads. This part of the brain is responsible for the image association which happens in our brains and also the storing and retrieval of memories, as and when we need them.
On lying, therefore, we tend to go against the visual memories which have been stored in our brains. Our mind has the information of a particular event while our mouth is speaking of something else. This part of the brain, hence, comes into play to reconcile the lie with the imagery it already holds.
It is often said that our eyes are the windows to our souls and that our eyes can betray us when we least expect it. The fact is that when we lie, our eyes do tend to betray us. The way they move and the way they react, a lie would often reflect in the eyes.
It has been observed, for example, that when we are creating a lie visually like speaking about a unicorn, our eyes move up and left. When we are talking to ourselves, internally, while lying, our eyes move down and rightwards. These subtle movements, therefore, give us away if observed calmly.
A confident person who is speaking the truth has nothing to be concerned about and there is not a lot of internal debate going on in their minds. This means that they can stand tall and proud and need to hide their feelings from anyone.
On the other hand, when a person is lying, their body language would reveal the same. Their feet, for example, would be pointing towards the door (escape tendency), their face may twitch a bit, they may move their arms a lot. Such instances of changes in the body language point to someone who is trying to lie.
When you are speaking the truth and when you aren't under stress, you breathe easy and you feel relaxed. Your breathing is not exerted and the flow is easy. Lying, however, causes stress and the fact is that stress affects your breathing pattern tremendously.
The emergence of stress in your system due to the lying and the fact that your mind is not accepting the disparity between the truth and the lie means that your body reacts negatively. Your breathing becomes slightly difficult and somewhat labored.
Like any other habit which improves with practice, as you keep lying, you get better at it. This is not to say that you should lie but the fact is that you understand the loopholes better, your mind and your body becomes accustomed to dealing with the stress.
Soon and before you know it, it becomes a part of your personality and lying becomes an everyday thing for you. Needless to say, this practice is extremely undesirable and hampers your personality in a negative way.
NOTE: This article does not intend to give medical/psychological advice and readers need to exercise caution.