bad cravings

So I'm taking a break from studying now, and my mind is thinking about cooking some good hot ramen once I'm done with my to-do list for today. I don't know why but every single time I'm studying, I crave for some instant noodles so badly. Sometimes I will give in and whip up some maggi, sometimes I ignore and try to sleep the craving away.

I know snacking while studying is normal. Good, if you snack the healthy stuff. But we all know how much I'm not into the whole health food. Once in a while, I do try to cook something healthy like ginseng soup, or add some vegetables on my plate. (Maybe like one slice of lettuce?)

But one thing I can never understand, why do I always crave for unhealthy food? Why don't I crave for carrots? Or salad without any dressing? Or healthy juice drink? I definitely need to change my diet as soon as possible. NEED, if I wanna age well.

What do you crave for when you're studying or doing some work?