Do daily affirmations work? What the research actually tests
Published by Motivational Team · Updated 2026-09-03
Daily affirmations can help in some settings, but research on reflecting on core values is not the same as repeating an unrealistic slogan.
Short answer: daily affirmations can be useful, but the evidence is more specific than many social posts suggest. Research does not show that repeating any positive sentence every morning will rewire your brain, guarantee confidence, or make the statement come true. The first distinction matters: self-affirmation in psychology usually means reflecting on a personally important value or source of self-worth. That is different from repeatedly telling yourself "I am successful" or "I am lovable." What does self-affirmation research show? A major review by Geoffrey Cohen and David Sherman describes self-affirmation exercises as brief interventions that can reduce defensive reactions when something threatens a person's sense of adequacy. The effects depend on the person, the situation, the timing, and what happens after the exercise; the review does not establish a universal daily formula. In one experiment with 80 undergraduates, David Creswell and colleagues asked participants to rank values and write about one of them before a stressful problem-solving task. Chronically stressed participants in the affirmation condition performed better than the comparison group. That result supports a narrow claim about a values exercise under stress, not the idea that slogans reliably improve every part of life. A brain-imaging study led by Christopher Cascio and Emily Falk found that reflecting on important values engaged regions involved in self-related processing and valuation, especially when participants considered the future. A brain scan can help researchers study a mechanism, but activation alone does not prove that an affirmation changes behavior, treats a condition, or permanently "rewires" the brain. Can positive statements backfire? They can. Joanne Wood and colleagues asked
Sources reviewed
- Cohen and Sherman (2014): The psychology of change — Review of self-affirmation theory, interventions, boundary conditions, and social context
- Creswell et al. (2013): Self-affirmation improves problem-solving under stress — Experiment with 80 undergraduates using a values-ranking and writing exercise
- Cascio et al. (2016): Neural systems associated with self-affirmation — Functional MRI study of self-related processing, valuation, and future-oriented reflection
- Wood, Perunovic, and Lee (2009): Positive self-statements — Experiments found that repeating a positive statement could make participants with low self-esteem feel worse