The information on this website is not intended for diagnosis or treatment. Please consult your physician for health concerns.

+90 850 321 50 00

Cancer and Nutrition

The role of nutrition during and after cancer treatment.

Written by: Saygı Hospital Health Guide Editorial Board
Published:

This content is for general information; please consult your physician for diagnosis and treatment.

References (5)

This content is for informational purposes only and does not constitute medical advice. You can book an appointment at our Onkoloji department. Book Appointment →

What is Cancer and Nutrition?

Nutrition plays a critical role at every stage of cancer care — from prevention to active treatment, recovery, and survivorship. Cancer and its treatments (chemotherapy, radiotherapy, surgery, immunotherapy) place significant metabolic demands on the body and often impair appetite, taste, digestion, and absorption.

Malnutrition affects up to 80% of cancer patients during their journey and is associated with poorer treatment tolerance, increased complications, longer hospital stays, and reduced survival. Cachexia (cancer-associated muscle wasting) is a particularly concerning syndrome that requires proactive nutritional intervention.

Personalized nutrition support, ideally led by an oncology-trained dietitian, focuses on maintaining weight and muscle mass, managing treatment side effects (nausea, mucositis, taste changes), supporting immune function, and improving quality of life. Dietary needs vary by cancer type, treatment phase, and individual factors.

Symptoms

Unintentional weight loss
Loss of appetite (anorexia)
Early satiety (feeling full quickly)
Taste changes (metallic, bitter, blunted)
Nausea and vomiting
Mucositis (mouth and throat sores) limiting intake
Diarrhea or constipation
Fatigue and muscle weakness from inadequate protein

Risk Factors

Advanced cancer stage (especially head/neck, GI, lung, pancreatic)
Aggressive multimodal treatment (chemo + radiation + surgery)
Pre-existing malnutrition or low body weight
Older age and frailty
Difficulty eating due to oral or esophageal involvement
Persistent nausea, vomiting, or diarrhea
Depression and reduced appetite
Limited access to nutrition counseling

When to See a Doctor?

If you experience any of the following symptoms, seek medical attention promptly:

  • Weight loss greater than 5% in one month or 10% in six months
  • Inability to meet basic calorie/protein needs for more than 7 days
  • Persistent nausea, vomiting, or diarrhea limiting intake
  • Severe mucositis or swallowing difficulty
  • New diagnosis of cancer (early dietitian referral improves outcomes)
  • Before major surgery (preoperative nutrition optimization)
  • Signs of dehydration or electrolyte imbalance
  • Survivors with concerns about long-term diet for recurrence prevention

Treatment Methods

01
Oral nutrition supplements (high-protein, high-calorie drinks): when intake is inadequate
02
Small frequent meals: 5-6 times daily, energy-dense foods
03
Protein-rich diet: 1.2-1.5 g/kg/day to preserve muscle
04
Antiemetic medications: ondansetron, granisetron for chemo-induced nausea
05
Mucositis management: cryotherapy, mouthwashes, soft/cold foods
06
Enteral nutrition (tube feeding): when oral intake fails for over 7-10 days
07
Parenteral nutrition: for severe gut failure or short-bowel syndrome
08
Specific anti-cachexia agents: olanzapine, megestrol acetate, omega-3 fatty acids

Which Department to Visit?

You can visit our Onkoloji department for these complaints. Our specialist physicians will create the most suitable treatment plan for you.

Learn About Onkoloji Department

Let us help you

You can make an appointment with our specialists or contact us for your concerns.

Book AppointmentContact Us

Related Health Topics

Other articles from the same department you may want to explore.

Anaemia

Dahiliye (İç Hastalıkları)

Anaemia is a low haemoglobin level that reduces oxygen delivery, causing fatigue, pallor, and shortness of breath. It is not a disease itself but a sign of many underlying conditions. Most cases are correctable with appropriate diagnosis and treatment.

Iron Deficiency Anaemia

Dahiliye (İç Hastalıkları)

Iron deficiency anaemia develops when dietary intake, absorption, or losses create an iron shortfall, most often affecting women and children. Identifying the underlying cause is the core of management, alongside iron replacement.

Vitamin B12 Deficiency

Dahiliye (İç Hastalıkları)

Vitamin B12 deficiency can cause megaloblastic anaemia, neurological symptoms, and cognitive impairment. Early treatment with intramuscular or oral B12 largely prevents irreversible complications.

Hypertension (High Blood Pressure) Management

Dahiliye (İç Hastalıkları)

Hypertension is often called the silent killer because it progresses symptom-free for years and can damage the heart, brain, kidneys, and eyes. Regular monitoring, lifestyle change, and evidence-based drug therapy dramatically reduce cardiovascular risk.

Chronic Kidney Disease

Dahiliye (İç Hastalıkları)

Chronic kidney disease is one of the most common complications of chronic conditions such as diabetes and hypertension, and can be silent in its early stages.

Hepatitis B (HBV)

Dahiliye (İç Hastalıkları)

Hepatitis B is a DNA virus infection causing acute and chronic hepatitis with risk of cirrhosis and hepatocellular carcinoma; diagnosis integrates HBsAg, HBeAg, anti-HBc, and HBV DNA with management based on disease phase using nucleos(t)ide analogues (entecavir, tenofovir) and universal infant vaccination.

Hepatitis C (HCV)

Dahiliye (İç Hastalıkları)

Hepatitis C is an RNA virus causing chronic hepatitis that may progress to cirrhosis and hepatocellular carcinoma; modern direct-acting antiviral (DAA) pangenotypic regimens (sofosbuvir/velpatasvir, glecaprevir/pibrentasvir) achieve sustained virologic response over 95% in 8–12 weeks with universal adult screening and cure for nearly all patients.

Fatty Liver Disease

Dahiliye (İç Hastalıkları)

Non-alcoholic fatty liver disease (NAFLD) is closely related to obesity and metabolic syndrome and is largely reversible with early treatment.

Health Disclaimer: The information on this page is prepared for general informational purposes only. It does not replace medical diagnosis and treatment. Please consult your physician for your complaints. Saygı Hospital does not accept responsibility for actions taken based on the information on this page.