Anorexia and Weight Loss in Gastric Carcinoma
Approximately 85% of patients with gastric carcinoma present with weight loss at the time of diagnosis, and anorexia is a predominant accompanying symptom, making these the most common presenting features of the disease. 1
Prevalence of Weight Loss
The evidence from ESPEN guidelines consistently demonstrates that:
- 85% of patients with stomach cancer have lost weight at diagnosis 1, 2
- 30% of these patients experience severe weight loss (>10% of initial body weight over 6 months) 1
- Weight loss is frequently the first symptom occurring in gastric cancer patients 1
This places gastric cancer among the highest-risk malignancies for nutritional compromise, comparable only to pancreatic cancer in terms of frequency and severity of weight loss.
Anorexia as a Core Feature
While the guidelines don't provide an exact percentage for isolated anorexia, they clearly establish that:
- Anorexia is intrinsically linked to the anorexia-cachexia syndrome that characterizes gastric cancer 1
- Cancer therapies are consistently associated with anorexia and further weight loss 1, 2
- Recent research confirms that anorexia and weight loss are the most common symptoms in gastric cancer patients 3
A 2019 study using validated assessment tools found that 69% of patients with oesophagogastric cancer were anorexic when systematically screened 4, though many cases go unrecognized without formal assessment.
Clinical Significance for Morbidity and Mortality
This matters critically because:
- Weight loss is an independent predictor of decreased survival in gastric cancer patients 2
- Impaired nutritional status leads to:
- 4-23% of terminal cancer patients die from cachexia itself 2
Critical Pitfall to Avoid
The metabolic mechanisms causing anorexia and cachexia are already operating early during tumor development 1. This is not a late-stage phenomenon. Therefore, waiting until patients develop obvious malnutrition before intervening represents a missed opportunity. The guidelines emphasize that cachexia should be viewed as a partially preventable phenomenon when addressed early 1.
Recent evidence demonstrates that nutritional status deteriorates even during the preoperative waiting period 5, and most patients are already malnourished at initial diagnosis 6. This underscores the need for immediate nutritional assessment and intervention at the time of gastric cancer diagnosis, not as a delayed consideration.