Part 3

Cortisol Causes Belly Fat, Shortens Telomeres

For the substudy, published in the journal Psychoneuroendocrinology, some of the same researchers took the same women and trial, but just measured their telomerase activity before and after the mindfulness training treatment. Women who received the training and who decreased their stress and belly fat also showed a greater increase in telomerase activity. A link between improved telomere function and reduced fasting blood glucose was also found.

“Improvements in stress, eating, and metabolic regulation may increase telomerase activity over time,” the study authors concluded.

The culprit in the deleterious effects that chronic stress has on the body looks to be the hormone cortisol, which increases as levels of stress increase. Though shorter bouts of cortisol secretion are normal and can have a stimulating effect on the body—as when the ability to run from danger is needed—the opposite is true of having continuously elevated levels of cortisol. This results in a chain reaction where fatty acids from outlying areas move into the abdominal regions and build up belly fat. Chronically elevated levels of cortisol also suppress telomerase, which can lead to shortened telomeres and accelerated cellular aging.