My last son I do!
I have replaced one of his meals a day with steamed veg, and he loves them...and is looking just a tad better on his stomach.
As far as the chart, even when he was very young he was off the chart as far as height, so it was not really a help at all.The doctor said he is fine, as he was not over weight till later.....some kids are going to grow up big.
My son now is 22 yrs old....and takes a mens size 15 shoe !!!