My DD is exactly the same - I fear for her weight as an adult (she is only just 2). She eats and eats until its all gone or you just stop feding her.
At the mo she is 91st for height and weight and is certainly not skinny.
Last night after she had eaten chicken, rice and vegetables followed by bananas and custard...I came downstairs eating a crumpet (was going to the gym so didn't eat with DD and DH) and she had a screaming fit until a gave her a bite.
I have always struggled with my weight (is under control at the mo and I am slim) and worry about this for my daughter.
The only way we have thought about dealing with it is for us to be an active family - ensuring lots of walks, sports activities etc so that even if she continues to eat for england the weight shouldn't be so much of a problem.
Any suggestion will be gratefully received here too!