There's been research correlating stress & overall health. By measuring, cortisol and adrenaline levels, researchers have found that stress affects the autonomic nervous system and neuroendocrine function. Placebo effect & conditioning has been studied countless times, taking a pill, can trigger biological response, even if it’s a placebo. This influences physiological functions such as hormone levels and immune responses, and works regardless of our conscious beliefs. There's no real division between mind and body , just networks of communication between the brain and neurological, endocrine and immune systems. So- Yes it's possible, but not to the extent that you'll get noticeable results without any physical traction (hard work) added to it.
