Further research into this effect for which there is no evidence is warranted... meanwhile, adverse effect on growth is sort of a loaded term. Those various populations on earth that are more insulin sensitive, more leptin sensitive than us--outside of the Masai, they also seem to be somewhat shorter than us. Not drinking milk or eating twinkies might have made the Hadza or the !Kung or the Kitivans shorter than us, hard to call this adverse over all.