There's A Mental-Health Side To Metabolic Health We Don't Talk About Enough
You might feel like your mental and physical health are separate, but we know they are not. The same factors that shape metabolic health, including sleep, activity, stress, and nutrition, can also affect your mood.
In a recent study of 906 college students1, researchers dug deeper into this connection by investigating how body fat was connected to depression. The findings contribute to the increasing evidence of the relationship between metabolic and mental health, while still recognizing that body size doesn't determine mental health.
About the study
Researchers examined the relationship between body fat and depression in young adults. Instead of using BMI, they measured body fat percentage (BFP), which distinguishes fat from muscle. (BMI only considers height and weight, so it doesn't show how much fat or muscle someone has.)
Researchers measured body fat using bioelectrical impedance analysis and classified participants as having obesity if they had a BFP above 25% for men or above 30% for women. Participants also completed the PHQ-9, a questionnaire used to screen for depression symptoms. Researchers then accounted for factors including sleep, physical activity, and other health and lifestyle variables.
Higher body fat was linked to greater odds of depression
Nearly 10% of participants had both obesity and depression.
After accounting for other factors, those with BFP-defined obesity had 62% higher odds of depression than those who didn't meet the study's obesity criteria.
Because the researchers only collected the data at one point in time, they could only identify an association, not a causal relationship.
However, the connection makes sense because depression can influence sleep, activity levels, nutrition, and body composition.
Mental and metabolic health share many of the same influences
There are lots of existing examples of the connection between mental and metabolic health.
- Sleep: Poor or irregular sleep can affect appetite and blood sugar regulation while also being associated with a higher risk of depression.
- Physical activity: Regular movement supports metabolic health and can benefit mood, too.
- Stress: Chronic stress can affect appetite and eating patterns while contributing to anxiety and depressive symptoms.
- Nutrition: Diet influences energy, gut health, and inflammation, all of which have connections to mental health.
In other words, mental and metabolic health don't operate in separate lanes. They're influenced by many of the same inputs.
Focus on habits that support your whole health
The study isn't a reason to fixate on body size. A more holistic approach to health is better, especially because the same habits can support both mental and metabolic health.
- Prioritize sleep: Aim for consistent sleep and wake times when possible.
- Keep moving: Walking, strength training, and other regular movement can support metabolic health and mood.
- Build balanced meals: Regular meals with protein, fiber-rich carbohydrates, healthy fats, and fresh produce can support steady energy and overall well-being.
- Make space for stress relief: Time outdoors, breathing exercises, social connection, and other activities you enjoy can help you decompress, which will benefit both mental and physical health.
The takeaway
Yes, this study found a link between higher body fat and depression, but changing your body composition shouldn't be treated as the solution to persistent low mood.
Depression has many potential contributing factors, so focusing on the basics like sleep, movement, nutrition, and stress management can help. Speaking with a mental health professional is also a great option, and the best way to get direct support.
