The headline is broadly defensible, but the qualifications matter. Effect sizes vary by population, the strongest claims rest on shorter trials, and credible voices push back on how it's typically framed.
Chronic stress however stress that lasts more than four to seven days causes changes in the feedback loop between the adrenals and the brain and the pituitary such that now the brain and the tary respond to high levels of glucocorticoids cortisol by releasing more of them it becomes a positive feedback loop
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normally high levels of glucocorticoid shut off the releasing hormones in the brain and in the pituitary they shut down in a so-called negative feedback loop
When you encounter a stressor, you deploy just as much cortisol as your body thinks you might need in order to resolve that stressor and probably not a whole lot more. And because cortisol lasts a while, as we just discussed, it gives you an opportunity to have more brain energy, bodily energy to resolve that stressor. But your brain and body sort of know at a biological level that you don't want cortisol too high for too long. That's why you have the negative feedback loop.