In the context of the programme, I say that "deceptively small" means "doesn't look like much but it's a lot of calories".
Thanks for that, I agree that sounds a very likely explanation as it could be understood in many ways
This thread was just a simple question guys and it took a well documented non-liked member to answer it as oppose to flaming fat people or classing this thread as a forum junk
But I do agree this forum lacks in consistency regarding topics diversifying