It is a known fact that body language is a crucial factor in all phases of life as it helps carve our perceptions of other people around us as well as their's towards us. It certainly is one thing that helps a lot in getting ahead in business for any man.
Most humans take in information either orally or visually. It has been found that 80% of what people remember is a combination of what they have seen and what they have heard. And for a rational human being, it takes about 7 seconds to form the first opinion about a person in the very first meeting.
Which is why it becomes more than necessary to keep a tab on one's body language when one is in a meeting or even doing any kind of a presentation.