Seriously, why is it so hard for people to believe that mind of matter really exists?

I mean, there have been many reported cases of people doing amazing things thought to be impossible.

One would think it would be impossible for a 140lb man to stick his arm staight out and have several people sit/pull on it without ever moving their arm....yet people indeed can DO this.

One would think it would be impossible for a human to bend solid steel....yet people can indeed DO this.

I could go on but fact is, our minds play a heavy roll in our bodies function.

So why is it really hard to believe that if someone REALLY believed they are losing weight, then they will?

I feel sorry for anyone who believes we are incapable of doing amazing and unthinkable things with our minds. Specially considering the thought that we only use a approx. 10% of our brain.