A Cross-Sectional Study: Association Between Nutritional Quality and Cancer Cachexia, Anthropometric Measurements, and Psychological Symptoms

<b>Background/Objectives</b>: Cancer is a complex disease that affects patients' nutritional and psychological status. This study aimed to assess the nutritional status of patients diagnosed with lung and gastrointestinal system cancers and evaluate its association with anthropometric measurements, nutrient intake, and psychological symptoms. <b>Methods</b>: This cross-sectional study was conducted with 180 patients with lung and gastrointestinal system cancers. Data were collected face-to-face by a questionnaire that included the Subjective Global Assessment-(SGA), Cachexia Assessment Criteria, 24 h Food Consumption Record, and Symptom Checklist-90-Revised-(SCL-90-R). Some anthropometric measurements were collected. <b>Results</b>: Body Mass Index (BMI) was found to be significantly lower (<i>p</i> < 0.001) in SGA-B (moderately malnourished) and SGA-C (severely malnourished) compared to those in SGA-A (well-nourished). The calf circumference was significantly lower (<i>p</i> = 0.002) in SGA-C compared to those in SGA-A and SGA-B. The mean SGA scores were found to be higher in cachexia-diagnosed participants (<i>p</i> < 0.001). The energy intake of SGA-C was significantly lower than SGA-A and SGA-B (<i>p</i> < 0.001). In addition, the energy intake of SGA-B was lower than SGA-A (<i>p</i> < 0.001). The protein intake of SGA-C was lower than SGA-A and SGA-B (<i>p</i> < 0.001). The protein intake of SGA-B was lower than SGA-A (<i>p</i> < 0.001). Regarding the intake of vitamins A, C, E, B1, and B6 and carotene, folate, potassium, magnesium, phosphorus, iron, and zinc, SGA-B and SGA-C were significantly lower than SGA-A (<i>p</i> < 0.001). Additionally, only phobic anxiety was found to be significantly higher in SGA-B than in SGA-A (<i>p</i>: 0.024). <b>Conclusions</b>: As the level of malnutrition increased, a reduction in some nutrient intake and anthropometric measurements was observed. No significant difference was found in any psychological symptoms except phobic anxiety. With this in mind, it is important that every cancer patient, regardless of the stage of the disease, is referred to a dietitian from the time of diagnosis.