Part of it is not our own fault, being purely genetic. More disturbing is the other part which is purely of our own doing.
"Anthropogenic impacts on the environment - including climate change - could have a deleterious effect on these limits," say the researchers.
This means that, in an ironic twist of fate, human activity and its effect on nature and the environment will play a part in limiting human performance as we stop growing stronger and taller and living longer.
"This will be one of the biggest challenges of this century as the added pressure from anthropogenic activities will be responsible for damaging effects on human health and the environment," Toussaint said in a statement.
"The current declines in human capacities we can see today are a sign that environmental changes, including climate, are already contributing to the increasing constraints we now have to consider."
This study contradicts a 2014 one which concluded that human height would continue to increase as long as diet and disease prevention improved.