what if I ate one icecream each day?!

I did that one time, I just got a little overweight. Don't eat it everyday maybe once or twice a week

I was 7 at one point.

Nothing bad. If you crave ice cream everyday, then have it. If your body doesn't want it anymore, you won't want to eat it anymore.

Just like telling a kid he can eat as much of his Halloween candy that he wants. As soon as he eats enough of it, his body will make it so he won't be able to stand to eat any more of it, thus no one can ever eat too much of anything, the body won't let it.

Just like when you are thirsty, as soon as you have enough water, you aren't thirsty anymore and wouldn't want to drink anymore.

Eat whatever you crave. That's how the body lets you know what nutrients it needs at any particular time, and why we don't crave the exact same food every day.

It depends on how much, but if you ate more than two scoops a day for the rest of your life, well you might be a little pudgy.

http://en.wikipedia.org/wiki/Ice_cream

You would gain weight, and be very unhealthy, once in a while is fine, but you could end up with diabetes or something so do not do that.

You will turn obese in a few years.