I have to say, when someone mis-states the second law of thermodynamics they tend to lose credibility.
That being said there is tall and tall, if you know what I mean. There is clear evidence that better nutrition, for example, is correlated with height. The agricultural revolution and loss of gatherer/hunter correlated with lower nutrition and loss of height. Modern humans are much taller than their counterparts 500 years ago. We see this in immigrant populations who come from impoverished countries or war zones; they tend to be smaller but in a generation or two the children are closer to the American norm. Poor prenatal care and nutrition correlates with low birth weight babies and smaller adults. The Dutch are the tallest people on average, partly due to genetics of body size but also due to universal health care, prenatal care, and nutrition programs.
That being said, all this is variation within the overall norm. There is a difference between 6'3" mean and 7' men.
And I see no evidence that unusually small people are healthier.
Obviously there are accomplished short people. And tall people.
