Huberman LabDr. Alia Crum on Huberman Lab: How Beliefs Alter Hormones
In Crum's milkshake study, belief alone tripled the ghrelin drop. She explains how food, stress, and exercise mindsets alter hormones and blood pressure.
CHAPTERS
- 0:40 – 2:30
Defining Mindsets and Their Role in Shaping Reality
Crum introduces mindsets as core beliefs that simplify complex domains like stress, intelligence, and health. She connects this to Carol Dweck's work and explains how these assumptions guide expectations, motivation, and behavior well beyond simple 'positive thinking.'
- •Mindsets are core assumptions about a domain (e.g., stress, intelligence, food) that orient expectations, explanations, and goals.
- •They act as simplifying systems to navigate complex realities but are consequential for motivation and outcomes.
- •Growth vs fixed theories of intelligence illustrate how believing in malleability increases effort and resilience.
- •Crum’s lab broadens mindset research beyond intelligence to stress, food, exercise, illness, and treatment side effects.
- 2:30 – 5:20
Mindsets Across Domains: Stress, Food, Exercise, Illness, Side Effects
The discussion expands to specific examples of mindsets and the typical negative defaults in Western culture. Crum highlights how assumptions about stress, healthy food, exercise sufficiency, illness seriousness, and side-effect meaning can shape attention, motivation, and physiology.
- •Common Western mindsets: stress is debilitating; healthy food is disgusting and depriving.
- •People may view exercise as insufficient even when objectively adequate, undermining benefits.
- •Illness can be viewed as catastrophe versus manageable; side effects as harm versus sign of treatment efficacy.
- •These beliefs direct what we notice, how we explain events, and how our bodies prepare and respond.
- 5:20 – 9:35
The Milkshake Study: How Beliefs Change Hunger Hormones
Crum details her Yale milkshake experiment testing whether beliefs about a food alter physiological response while nutrients are held constant. Believing a shake was indulgent versus sensible produced dramatically different ghrelin patterns, revealing that mindset about food can modulate satiety and metabolism.
- •Participants drank the same 300-calorie shake twice, but were told it was either a 620-calorie 'indulgent' or a low-calorie 'sensible' shake.
- •Ghrelin, the 'hunger hormone,' should fall after calorie intake to signal satiety and increased metabolism.
- •When labeled indulgent, ghrelin dropped about three times more, as if participants had eaten more food.
- •The more adaptive physiological response came from believing one was eating richly and sufficiently, challenging the intuition that “healthy” is always the better mindset.
- 9:35 – 13:50
Diet Camps, Placebo, and Nocebo: Belief Effects in Nutrition and Health
Huberman and Crum connect diet subcultures and placebo/nocebo research, arguing that belief systems around plant-based, keto, or carnivore diets likely contribute to perceived benefits. They emphasize that outcomes are a joint product of objective behavior and subjective belief, including negative expectations that create real side effects.
- •Different diet groups often report strong benefits that may be partly driven by mindset and social reinforcement.
- •It’s not ‘all in the mind’ or ‘all in the body’—results reflect both the intervention and beliefs about it.
- •Psychogenic fever and nocebo effects show how negative expectations can raise body temperature and increase reported side effects.
- •Medical warnings about side effects can inadvertently increase their incidence through nocebo mechanisms.
- 13:50 – 18:00
Hotel Housekeepers Study: Reframing Work as Exercise
Crum describes research with hotel housekeepers who were physically active but did not perceive their work as exercise. Simply educating one group that their work met exercise guidelines improved weight and blood pressure without behavior change, illustrating how exercise mindsets influence health.
- •Housekeepers met or exceeded exercise guidelines through their jobs but rated their own exercise as very low.
- •They viewed their work as tiring and painful, not as beneficial physical activity.
- •Intervention group was informed that their work counted as exercise and matched Surgeon General guidelines.
- •After four weeks, the informed group showed weight loss and ~10-point systolic blood pressure reductions, despite no measurable change in activity.
- •Generic public health guidelines often fail to motivate and can create harmful ‘never enough’ mindsets about exercise.
- 18:00 – 22:00
Rethinking Stress: From Public Health Villain to Potential Asset
The conversation shifts to stress, contrasting simplistic ‘stress is toxic’ messaging with research showing stress can enhance focus, learning, and growth. Crum introduces the concept of stress mindsets and describes interventions that reframe stress as potentially enhancing, leading to better health and performance.
- •Public health messaging heavily emphasizes the harms of stress, but the scientific literature is more nuanced.
- •Stress can narrow focus, increase attention, speed information processing, and promote ‘physiological toughening’.
- •Post-traumatic growth research shows that severe stress can deepen values, relationships, and appreciation for life.
- •Crum focuses on the global mindset about stress—seeing it as inherently harmful vs potentially enhancing.
- •An ‘enhancing’ stress mindset is associated with better health, well‑being, and performance.
- 22:00 – 25:30
Stress Mindset Intervention: UBS Study and Mechanisms of Change
Crum outlines a field experiment during the 2008 financial crisis where stressed employees watched brief videos framing stress as either harmful or enhancing. Those exposed to enhancing messages shifted their mindsets and experienced fewer physical symptoms and higher performance, showing that stress beliefs are malleable and impactful.
- •UBS employees under significant financial and job-related stress were randomized to watch ‘stress-is-harmful’, ‘stress-is-enhancing’, or no videos.
- •Nine minutes of enhancing-framed content over a week shifted global stress mindsets.
- •Participants with enhancing mindsets reported fewer stress-related physical symptoms and better work performance.
- •The harmful framing videos did not make people worse, likely because that message was already dominant in their environment.
- •An enhancing stress mindset does not mean the stressor is good; it means the stress response can be used to produce beneficial outcomes.
- 25:30 – 27:20
How Stress Mindsets Shift Motivation, Emotion, and Physiology
Crum explains how viewing stress as harmful drives ‘freak out or check out’ responses, whereas an enhancing mindset prompts using stress to pursue growth and problem-solving. She discusses changes in affect and hormones like cortisol and DHEA, and Huberman links this to work on adrenaline, dopamine, and testosterone.
- •Debilitating stress mindsets lead to hyper-reactivity (freak out) or avoidance/denial (check out).
- •Enhancing stress mindsets shift motivation toward learning, strengthening relationships, and improving priorities.
- •People with enhancing mindsets show more positive affect, not necessarily less negative affect.
- •Some studies show more moderate cortisol and higher DHEA responses under stress when people adopt enhancing mindsets.
- •Related research shows acute stressors (e.g., first-time skydive) can transiently raise anabolic hormones like testosterone, aligning with the idea of stress as a growth signal.
- •Crum conceptualizes mindsets as a portal between conscious beliefs and subconscious physiological responses.
- 27:20 – 29:40
A Practical Framework: Acknowledge, Welcome, and Utilize Stress
The discussion turns explicitly practical as Crum offers a three-step method to leverage stress. She and Huberman highlight stress’s built-in advantages—like sharpened attention and faster processing—and contrast this with approaches that focus only on managing or suppressing stress.
- •Redefining stress: a neutral effect of experiencing or anticipating adversity in goal‑related domains.
- •We only stress about things we care about; stress is a signal of valued goals.
- •Three-step protocol: (1) Acknowledge that you are stressed. (2) Welcome it as evidence of caring. (3) Use the physiological activation to pursue the underlying goal.
- •This shifts the question from ‘How do I get rid of stress?’ to ‘How do I make stress work for me?’
- •Stress response is generic and built-in; we don’t need to train it, only to channel it effectively.
- 29:40 – 34:12
Personal Roots, Placebo’s Untapped Potential, and Invitation to Experiment
Crum reflects on her athletic and family background that primed her to value the mind–body connection and describes her mission to rigorously harness these effects in medicine and daily life. She urges listeners to examine and update their own mindsets and offers resources for applying these ideas.
- •As a gymnast, Crum saw firsthand how mental imagery and belief radically influence performance with the same physical body.
- •Her father’s work in martial arts and meditation exposed her early to mind–body practices.
- •She believes medicine underutilizes placebo-type mechanisms; we know they exist but rarely design care to leverage them intentionally.
- •Her guiding question: what more can we consciously do with the power of the mind?
- •She encourages people to ‘treat yourself like a scientist’ by testing and revising their own mindsets.
- •Resources and interventions (e.g., the ‘rethink stress’ toolkit) are available via her Stanford lab website and the Stanford SPARK platform.
