More than that can increase anxiety and blood pressure.
"If all the documentary diet was of that nature, it would increase anxiety," Professor Aber said.
Some like to hear the numbers, while for others numbers only increase anxiety without increasing understanding.
The Swiss finding of uranium 236 is certain to increase anxiety in the debate over why 15 European troops recently died of leukemia and others have unexplained illnesses.
More research is needed, he said, and "a very high level of caffeine can increase anxiety" and insomnia, potentially reversing any mood-lifting effects.
Enjoyable activities elicit dopamine release to enhance learning, while reducing the secretion of stress hormones, which can impede learning and increase anxiety, sometimes for years.
But AOL Time Warner is expected to leave open the possibility of turning up more problems or restating past revenue, and deferring its internal reckoning will probably increase anxiety about potential liability in lawsuits by shareholders and securities regulators.
We also know far more than Freud or Kierkegaard did about how different neurotransmitters – such as serotonin, dopamine, gamma-aminobutyric acid, norepinephrine and neuropeptide Y – reduce or increase anxiety.
Caffeine can increase heart rate, interfere with sleep, cause heartburn and increase anxiety, and heavy consumption isn't advised for women who are pregnant or breast-feeding and for those who take certain medications.
He also acknowledged the centrality of the issue to Arab leaders, saying it was necessary to "remove the level of humiliation that exists in the region," reflected in Palestinian grievances, which increase anxiety and aggravate violence.
Checkpoints on highways, closed parking structures at airports, flyovers by military aircraft and other security measures, they added, while reassuring many people, may for others increase anxiety by providing a constant reminder of danger.
