Relationship between fatigue and appetite
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Fatigue and Appetite: Symptom Associations in Chronic Illness and Depression
Research consistently shows a strong relationship between fatigue and changes in appetite, especially in people with chronic illnesses such as heart failure and advanced cancer, as well as in those experiencing depression. In heart failure patients, decreased appetite is commonly reported and is closely linked to higher levels of fatigue, depressive symptoms, and lower quality of life. These associations persist over time, indicating that fatigue and poor appetite often occur together and may reinforce each other in chronic disease contexts . Similarly, in advanced cancer, poor appetite and severe fatigue are both associated with higher mortality rates, suggesting that these symptoms are interconnected and may reflect underlying disease severity or systemic inflammation .
Inflammation, Fatigue, and Appetite Changes
Multiple studies highlight the role of inflammation in connecting fatigue and appetite changes. Elevated inflammatory markers, such as C-reactive protein (CRP) and interleukin-6 (IL-6), are associated with both increased fatigue and altered appetite in patients with depression and advanced cancer 56710. These findings suggest that inflammation may drive a cluster of symptoms—including fatigue and appetite loss—often seen in chronic illness and depressive disorders. Notably, higher CRP is linked to both increased fatigue and appetite changes, while IL-6 may be more specifically associated with decreased appetite . This symptom cluster is sometimes referred to as an "immunometabolic phenotype" of depression 5610.
Physical Activity, Fatigue, and Appetite Regulation
The relationship between fatigue and appetite is also influenced by physical activity. Acute, fatiguing exercise—such as resistance training to volitional fatigue or short-term maximal intensity exercise—can temporarily suppress appetite and reduce food intake, likely through changes in appetite-regulating hormones and myokines released during exercise 34. However, some studies suggest that the sensation of fatigue induced by physical activity may, in certain contexts, increase the desire for specific foods, such as fatty foods, possibly through neural mechanisms in the brain's supplementary motor area . These findings indicate that the relationship between fatigue and appetite is complex and may depend on the type and context of fatigue experienced.
Interventions and Symptom Management
Supportive interventions, such as integrative oncology care with nurse guidance, have been shown to improve both fatigue and appetite in cancer patients, suggesting that addressing one symptom may help alleviate the other . This further supports the idea that fatigue and appetite are closely linked and may respond to similar therapeutic strategies.
Conclusion
Overall, research demonstrates a strong and consistent relationship between fatigue and appetite changes across various health conditions. Inflammation appears to be a key biological link, while physical activity and supportive care interventions can modulate both symptoms. Understanding and addressing the interplay between fatigue and appetite is important for improving quality of life and outcomes in patients with chronic illness and depression 1567+3 MORE.
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Most relevant research papers on this topic
Changes in Appetite During the Heart Failure Trajectory and Association With Fatigue, Depressive Symptoms, and Quality of Life
Decreased appetite in heart failure patients persists over time, with factors such as fatigue, depressive symptoms, and low quality of life contributing to this issue.
Neural effects of hand-grip-activity induced fatigue sensation on appetite: a magnetoencephalography study
Hand-grip activity-induced fatigue sensation may increase the appetite for fatty foods, potentially due to neural activity in the supplementary motor area.
Low- and high-load resistance training exercise to volitional fatigue generate exercise-induced appetite suppression.
Both low-load and high-load resistance training to volitional fatigue cause appetite suppression, with limited effects on anorexigenic hormones or free-living energy intake.
Effect of Acute Sprint Exercise on Myokines and Food Intake Hormones in Young Healthy Men
Acute short-term fatiguing exercise can transiently suppress hunger sensations and food intake in humans, involving exercise-induced alterations in plasma hormones and the release of myokines like irisin and IL-6.
How handling extreme C-reactive protein (CRP) values and regularization influences CRP and depression criteria associations in network analyses
Including individuals with C-reactive protein (CRP) values > 10 mg/L and using nonregularized networks in network analyses improves estimates of associations between CRP and depression criteria.
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