Much theory and research in social cognition has been devoted to understanding cognitive biases in human thought and message framing. These information is used to address health behaviors. Health messages can be framed in terms of gains and losses. Messages that emphasize benefits are more persuasive for behaviors that have certain outcomes. Recommendations regarding exactly how to take action increase effectiveness as well.
Here's a closer look at how these cognitive biases influence the day-to-day decisions you make that can affect your health, from small choices like what to eat for lunch to the bigger decisions that could have lifelong consequences for your health.
Confirmation Bias
How does this confirmation bias influence your health? We tend to focus on the news stories or research reports that reinforce our current health and lifestyle choices while dismissing possibly useful and relevant information that conflicts with our behavior, habits, preferences, and choices. For example, if you exercise a few times a week but otherwise spend most of your time sitting at a desk, you might be more inclined to ignore health reports warning that too much sitting might be hurting your health.
Optimism Bias
If you ask people to estimate how likely it is that they will ever experience an accident, serious illness, divorce, or job loss, they will likely underestimate the true probability of these events happening to them. People are more likely to believe that their lives will be filled with positive events such as earning high incomes, owning their own homes, and living long lives. This bias means we are also more likely to believe that engaging in unhealthy or risky behaviors will not have a negative effect on our health. This is particularly true if we believe that the negative outcomes are rare or unlikely.
For example, you would be more likely to continue tanning and neglecting to use sunscreen if you believed that skin cancer is a rare disease. In doing so, you not only underestimate the overall prevalence of skin cancer, but optimism bias leads you to underestimate the likelihood that you would get skin cancer—regardless of your health choices and behaviors.