Why does my eye twitch?

Question

My left eye occasionally twitches, ie; the thickish part of the lower lid suddenly moves toward my nose

Sometimes it's just one little flick, sometimes it flicks backwards and forwards for as long as 2 minutes

It's very annoying! Has been happening for about a week

As far as I can tell it doens't happen in correspondance with anything else i'm doing (looking into the distance, smoking ect)

Recently I started eating a lot of healthy food (nuts and seeds, greens, fruit, cutting down on chips and noodles ect) - Could that be related?

Any help appreciated :3

And no I am not taking any drugs (other than caffiene and Nicotine, which are hardly new to my body)

Answer 1

1. You're tired

or

2. You're watching too much TV, or on the computer too much.

Answer 2

you have a lazy eye ?

Answer 3

stress

Answer 4

Muscle spasm.  

I find applying slight pressure to the twitch with my index finger (and keeping it there for about 10 seconds) usually gets rid.