How Managers Affect Employee Health and What Effective Leaders Do Differently
An employee sees their physician once or twice a year. They see their manager most days. That exposure, combined with the biology of the stress response and two decades of organizational research, is why a manager can have more influence over someone's physical health than their doctor does. We lay out the physiology in more detail in why your boss's trust matters more than your doctor.
In a low-trust environment, the body responds to interpersonal threat the way it responds to physical danger. Adrenaline, cortisol, and norepinephrine spike. Heart rate rises. Non-essential functions shut down. Human physiology isn't built to hold that state for a 40-hour week, 50 weeks a year.
What low trust does to the body
Chronic cortisol elevation, the kind that builds when employees can't predict how their manager will react, has specific health consequences. Long-term effects include headaches, gastrointestinal problems, muscle tension, elevated blood pressure, and disrupted sleep. Over longer periods, chronic stress raises the risk of depression, anxiety disorders, hypertension, cardiovascular events, weight gain, insulin resistance, and type 2 diabetes (Yaribeygi et al., 2017; Joseph and Golden, 2017; Mariotti, 2015; Hackett and Steptoe, 2017).
The cognitive cost is harder to see. Employees in low-trust environments spend a lot of mental capacity on threat monitoring: decoding the tone of emails, anticipating reactions, rehearsing self-protective answers before meetings. That capacity isn't available for the work. Creativity narrows, information sharing drops, and people start complying instead of contributing judgment.
Organizations see a productivity and quality problem. The root is physiological. The signs of a low-trust work environment show the behavioral side: communication narrows, blame replaces ownership, and knowledge turns into a competitive resource. Each of those keeps the stress response running, which is how low-trust leadership damages employee health over time.
Trust is a leadership responsibility
The research is clear about who holds the accountability.
Leader behavior is the main driver of psychological safety, the condition that decides whether employees can learn, speak up, and perform at full capacity (Edmondson, 1999; 2018). Trust also flows downward: leaders who are trusted by their own managers extend more trust to their direct reports, and that effect cascades into measurably higher performance (De Cremer et al., 2018). Lee and Rasdi's 2025 research adds that trust runs both ways in principle, but the power gap means leader behavior sets the conditions.
Research among public health leaders links emotional intelligence to the conditions of trust (Knight et al., 2015). Five capabilities do most of the work: self-awareness, self-regulation, empathy, the discipline to pause before reacting, and consistent follow-through. Our overview of the five domains of people skills for managers covers how each one is built.
Self-awareness as the foundation
Self-aware leaders understand how their mood and energy affect the people around them. They can name their triggers and recognize when they're reacting instead of responding. That matters operationally: reactions are unpredictable and erode safety, while deliberate responses build it.
Leaders without self-awareness create teams that spend energy managing around them. Hierarchy shields leaders from the feedback that would expose the gap, so it persists until someone works on it on purpose.
Self-regulation as a trust signal
A leader who visibly manages their own reaction in a tense moment teaches the team something no policy can: emotions are allowed here, and they don't throw things off course. The emotion regulation framework for leaders, drawn from dialectical behavior therapy (DBT), gives leaders a five-step process for exactly this, turning a reactive emotional state into an accurate read of the situation before they respond.
Predictability is the mechanism. Employees trust leaders they can anticipate. A manager who hears bad news without punishing the messenger, pauses before responding to charged situations, and stays steady across conditions tells the team the environment is safe. Over time, the team stops filtering information and starts bringing real problems forward. That's why these skills have operational consequences as well as interpersonal ones.
Controlled breathing is the fastest physical route to regulation. Resonant-frequency breathing, with inhalation and exhalation each lasting about six seconds, produces measurable reductions in the stress response (Lehrer et al., 2000). Any leader can use it once they understand what it does.
Empathy as an operational skill
Sympathy acknowledges an event. Empathy engages with a person's experience of it.
Empathetic leaders try to understand what someone is going through before offering solutions or judgment. They notice what isn't being said: hesitation, body language, the energy behind the words. They adjust to what the person needs in the moment instead of applying a standard response. People feel seen as whole people instead of roles, and that produces the loyalty and discretionary effort engagement surveys try to measure.
Follow-through as the proof
Emotional intelligence without action is just posture. Leaders who build real trust have the hard conversations when they're needed, give honest feedback that serves the person's development (the core of radical candor), and deal with problems instead of managing around them. They advocate for their people in rooms those people aren't in. Advocacy earns the most trust because the employee rarely sees it and it costs the leader something.
Employees find out eventually whether their manager has their back. The track record builds the relationship or wears it down.
Organizations where leaders practice these skills report lower turnover, higher engagement, lower healthcare use, and teams that surface problems before they become failures.
Kestryl Edge works with leaders to build the people skills behind high-trust teams. If your team is hoarding information, hesitating to raise problems, or losing people, see how we work or talk to us about what that work looks like.
Want more on the leadership behaviors that build healthier, higher-performing teams? Dan Korus, Kestryl Edge founder, publishes The Updraft, a weekly newsletter on leadership, trust, and how teams actually perform. Subscribe here.
References
De Cremer, David, Marius van Dijke, Marshall Schminke, Laetitia De Schutter, and Jeroen Stouten. "The Trickle-Down Effects of Perceived Trustworthiness on Subordinate Performance." Journal of Applied Psychology 103, no. 12 (2018): 1335-1357. https://doi.org/10.1037/apl0000339
Edmondson, Amy C. "Psychological Safety and Learning Behavior in Work Teams." Administrative Science Quarterly 44, no. 2 (1999): 350-383. https://doi.org/10.2307/2666999
Edmondson, Amy C. The Fearless Organization: Creating Psychological Safety in the Workplace for Learning, Innovation, and Growth. Hoboken, NJ: Wiley, 2018.
Hackett, Ruth A., and Andrew Steptoe. "Type 2 Diabetes Mellitus and Psychological Stress: A Modifiable Risk Factor." Nature Reviews Endocrinology 13 (2017): 547-560. https://doi.org/10.1038/nrendo.2017.64
Joseph, Joshua J., and Sherita H. Golden. "Cortisol Dysregulation: The Bidirectional Link Between Stress, Depression, and Type 2 Diabetes Mellitus." Annals of the New York Academy of Sciences 1391, no. 1 (2017): 20-34. https://doi.org/10.1111/nyas.13217
Knight, J. R., H. M. Bush, W. A. Mase, M. C. Riddell, M. Liu, and J. W. Holsinger. "The Impact of Emotional Intelligence on Conditions of Trust among Leaders at the Kentucky Department for Public Health." Frontiers in Public Health 3 (2015): 33. https://doi.org/10.3389/fpubh.2015.00033
Lee, Michelle Chin Chin, and Roziah Mohd Rasdi. "Trust in Leader as Antecedent to Trust in Team Members, Team Cooperation, and Team Performance: A Multilevel, Longitudinal, Mediational Perspective." Psychological Reports (2025). https://doi.org/10.1177/00332941251377383
Lehrer, Paul M., Evgeny Vaschillo, and Bronya Vaschillo. "Resonant Frequency Biofeedback Training to Increase Cardiac Variability: Rationale and Manual for Training." Applied Psychophysiology and Biofeedback 25, no. 3 (2000): 177-191. https://doi.org/10.1023/A:1009554825745
Mariotti, Agnese. "The Effects of Chronic Stress on Health: New Insights into the Molecular Mechanisms of Brain-Body Communication." Future Science OA 1, no. 3 (2015): FSO23. https://doi.org/10.4155/fso.15.21
Yaribeygi, Habib, Yunes Panahi, Hedayat Sahraei, Thomas P. Johnston, and Amirhossein Sahebkar. "The Impact of Stress on Body Function: A Review." EXCLI Journal 16 (2017): 1057-1072. https://doi.org/10.17179/excli2017-480