Edited by Eleonora Maria Vladimirou, Well.cy
In recent years, cortisol has become a hot topic in conversations about health, stress and weight gain. On social media, it is often labeled the “fat-storing hormone,” with many people blaming it for food cravings, stubborn belly fat and difficulty losing weight. But how much truth is there to these claims?
Cortisol is a hormone produced by the adrenal glands that plays a key role in the body's response to stress. While it is closely associated with stressful situations, its functions go far beyond that. It helps regulate metabolism, blood pressure, blood sugar levels, immune function and the circadian rhythm, which acts as the body's internal clock.
When we face a threat or a demanding situation, the body increases cortisol production. In the short term, this is completely normal and even beneficial. Cortisol helps us stay alert, focused and ready to respond to whatever challenges we face.
Problems can arise when stress becomes a constant part of daily life. Work demands, time pressure, financial insecurity, lack of rest and constant stimulation can keep cortisol levels elevated for extended periods. Over time, this can affect both physical and mental health.
How cortisol affects appetite and cravings
One of the most common effects of chronic stress is a change in eating habits. Cortisol affects areas of the brain involved in reward and pleasure, which can increase cravings for foods high in sugar, salt and fat.
That helps explain why so many people reach for sweets or fast food after a difficult day. Prolonged stress may also affect other hormones responsible for regulating hunger and fullness, making it harder to control appetite and increasing the likelihood of overeating.
Does cortisol actually cause weight gain?
The answer is no, at least not on its own. Cortisol does not automatically cause weight gain. However, when levels remain elevated for long periods, the hormone can contribute indirectly to fat accumulation, particularly around the abdomen.
Chronic stress is also often linked to less physical activity, poor sleep and increased calorie intake. Together, these factors can have a much greater effect on body weight than cortisol alone.
Why sleep matters
Cortisol follows a natural daily rhythm. Levels typically peak in the morning, helping the body wake up and become active, before gradually declining throughout the evening.
Insufficient sleep, irregular schedules and shift work can disrupt this rhythm. When that happens, the body may remain in a heightened state of alertness, contributing to fatigue, increased appetite and difficulty managing hunger.
Who is most at risk?
People who experience chronic work-related or psychological stress may be more vulnerable to disruptions in cortisol regulation. The same applies to those with sleep problems, shift workers, and people living with obesity or metabolic syndrome.
Can you lower cortisol levels?
Despite the claims circulating online, no single food or supplement can magically lower cortisol. Experts agree that adopting a more balanced lifestyle is the most effective approach.
Getting enough quality sleep, exercising regularly, managing stress, eating a balanced diet, walking daily, spending time in natural light and maintaining consistent meal times can all help support healthy cortisol regulation and improve overall well-being.
The bottom line
Cortisol is not the enemy it is often made out to be. It is an essential hormone that helps the body function properly. The real issue is not cortisol itself, but the chronic stress that can come with modern life.
Prioritizing sleep, mental health and healthy daily habits can help support normal cortisol levels and maintain a healthy body weight.
Sources: Mayo Clinic, Cleveland Clinic, Endocrine Society and National Institutes of Health.
