Nutrition

Frequently Asked Questions About Nutrition

Why should cancer patients pay more attention to nutrition?
Cancer and its treatments increase the body’s need for energy and protein. Inadequate nutrition can lead to muscle loss, weakness, treatment interruptions, and an increased risk of infections. Proper nutrition helps patients tolerate treatment better and maintain quality of life.

Is weight loss normal in cancer patients?
No. Although weight loss is common, it should not be considered normal. Especially rapid and unintentional weight loss is associated with muscle loss and poorer response to treatment. It should be recognized early and addressed promptly.

How many calories should a cancer patient consume per day?
In general, the daily energy requirement for cancer patients is approximately:
25–30 kcal/kg/day
This may vary depending on the stage of disease, treatment, and level of physical activity.

Why is protein intake so important?
Protein is essential for preventing muscle loss and supporting the immune system.
Recommended protein intake for cancer patients:

• At least 1 g/kg/day
• Preferably 1.2–1.5 g/kg/day
  Insufficient protein intake accelerates muscle wasting.

Are vitamin and mineral supplements necessary?
Routine use of high-dose vitamin or mineral supplements is not recommended.
Supplements should only be given under the supervision of a doctor or dietitian if a deficiency is confirmed by blood tests. High-dose antioxidants may reduce the effectiveness of some cancer treatments.
Vitamin supplements at recommended daily (physiological) doses may be used if needed.

Are herbal products and “natural” remedies safe?
Most products marketed as “natural” have not been proven effective in cancer treatment.
Some herbal products may:

• Interact with chemotherapy drugs
• Cause liver or kidney damage
  They should always be discussed with a doctor before use.

Are fasting, ketogenic, or completely sugar-free diets beneficial?
No.
Fasting regimens, ketogenic diets, or overly restrictive diets may:

• Increase weight and muscle loss
• Reduce tolerance to treatment
  There is no proven diet that cures cancer by “starving” it.

What should be done if there is loss of appetite?
Loss of appetite is very common and must be addressed:

• Small but frequent meals
• Energy- and protein-dense foods
• Oral nutritional supplements
• Treatment of contributing factors such as nausea, pain, or constipation
  Medical nutritional support is planned when necessary.

What if a patient cannot eat orally?
If adequate oral intake is not possible:

1. Enteral nutrition (via the stomach or intestines)
2. Parenteral nutrition (via the bloodstream), if necessary
   The goal is always to use the most natural and least invasive method possible.

Should nutrition be different during chemotherapy or radiotherapy?
Yes. Treatment-related side effects (such as mucositis, diarrhea, or nausea) can make eating difficult. During this period:

• Nutritional counseling
• Oral nutritional supplements
• Enteral nutrition, if needed
  should be initiated early to prevent weight loss and treatment interruptions.

Is exercise safe?
Yes. Appropriate levels of exercise:

• Reduce muscle loss
• Alleviate fatigue and depression
• Improve quality of life
  Light walking at least 3 days per week and individualized exercise programs are recommended.

Is nutrition necessary for patients with advanced (palliative) cancer?
Nutritional decisions should be made together with the patient, taking into account life expectancy and goals of care.
The main goals are:

• Providing comfort
• Avoiding burdensome interventions
• Respecting the patient’s wishes
  Aggressive nutritional support is not appropriate for every patient with advanced disease.

How should nutrition be after cancer treatment?
After cancer treatment:

• Maintaining a healthy weight
• A diet rich in vegetables, fruits, and whole grains
• Limiting red meat and alcohol
• Regular physical activity
  are recommended. This approach supports overall health, and maintaining an ideal weight may positively influence recurrence risk in some cancers.

When should nutritional support be managed by a specialist?
Dietitian and physician support should be sought if:

• There is unintentional weight loss
• Daily intake is insufficient
• There are swallowing or digestive problems
• Treatment side effects affect nutrition

For detailed information about examination processes, treatment options, and appointment requests, you can contact us via the Contact page.