it is possble to grow taller than a your genetic predicted height. This is becaue you all have a gentic height range we are to be not an exact height. So given poor diet we can fall below the predicted height or good diet pass it. The timeing of the growth spurt is a key player in all this however. The longer the time it takes to get it the more base inches you are growing which can make you end up quite a bit taller than exspected acually. You can also have you knees broken. The calcium biuld up from them healing might add up to an nch or two. WOW!! I could do it:=) Yes alcohol can prevent you from meeting your maximum height potential.