まだ with verb ending ～ません and ～ていません


In response to the question 「もう昼ご飯を食べましたか。」how do the following replies differ
in meaning?

> いいえ、まだ食べていません。  
>  いいえ、まだ食べません。

I tried to understand the differences through this website where it's written
entirely in Japanese. <http://www.alc.co.jp/jpn/article/soudan/028.html>
Unfortunately I don't understand much of what they're saying and so I've
turned to you guys for help :)




まだ食べていない means "I haven't eaten it yet".

まだ食べない means "I won't eat it for the time being".

