The Green Green Grass

Though no one can deny that cats eat grass, there are only theories as to why they do. Some claim it is to get extra niacin, a B vitamin abundantly available in most fresh young grain grasses. Perhaps cats eat it to make themselves vomit. Some people believe cats eat it to help pass fur balls along while others say they just need the fiber for other nutritional purposes. And some say cats eat grass because the like it or like to ‘try' things. Which theory is correct, or are any of them right?