I am a working man and my manager suggests me to eat popcorn at workstation. As this will help me to concentrate on my work and make me active also. But as I am a health conscious person so before consuming popcorn I want to know that how many calories in popcorn are there? And how much of it having daily will not harm my health? I am not going to add any kinds of extra add- on like butter. Just plain salted popcorn.