What are the mechanisms of malnutrition in cancer patients?

Anorexia is a common symptom in cancer patients, caused by the direct effect of the tumor or by the reaction of the organism to the tumor.
Cachexia is a syndrome that affects 60% of people who die from advanced cancer and is characterized by weight loss, anorexia, asthenia, anemia, chronic nausea, and immunosuppression.
The loss of body weight in cancer patients is mainly due to a decrease in muscle and adipose tissue, which can lead to dysfunction in organs such as the heart.
The Anorexia-Cachexia syndrome is a vicious cycle where malnutrition leads to a decrease in food intake, which in turn increases the risk of infections and worsens malnutrition.