# Nutrition in acute lymphoblastic leukemia
Nutritional challenges during treatment
Acute lymphoblastic leukemia (ALL) and its treatment present significant nutritional challenges. Chemotherapy and targeted medications damage not only cancer cells but also healthy cells in the mouth, esophagus, and intestinal wall. This can lead to painful sores, taste changes, nausea, and diarrhea.
ResearchediPositive results in clinical studies, not yet standard treatment
Studies show that many children experience weight loss during ALL treatment and their food intake decreases. This can have consequences for the body and recovery potential.
The intestinal wall also plays an important role in resistance to infections. If it is damaged by treatment, bacteria and other harmful substances can more easily enter the bloodstream. This means that hygiene around food preparation (clean preparation, cool storage, avoiding certain raw foods) is especially important, particularly when white blood cell counts are low.
Calorie requirements and weight maintenance
During and shortly after intensive chemotherapy, patients sometimes have higher energy requirements due to infections, fever, and the body's response to treatment. At the same time, they often eat less due to nausea and taste changes. This combination makes weight loss and malnutrition a real risk.
ResearchediPositive results in clinical studies, not yet standard treatment
Studies show that nutritional status during treatment plays a role in how well patients tolerate therapy and recover.
Small, frequent meals and snacks may work better than three large meals. Some people tolerate cold or soft food better than warm food when the mouth is painful. Beverages can form an important part of calorie intake if eating is difficult.
Oral health and taste
Chemotherapy can cause mouth sores (mucositis), which make eating and drinking very painful. Taste changes can also occur: food may taste metallic or feel completely tasteless.
ResearchediPositive results in clinical studies, not yet standard treatment
Good oral care (regular rinsing, soft toothbrush, avoiding very hot or sharp foods) helps prevent or limit mouth sores.
There are no medications for taste changes, but some patients recognize certain foods better than others. This is very individual and can vary from day to day.
Intestines and digestion
Chemotherapy can directly damage the intestines. This can cause constipation or, more often, diarrhea. A damaged intestinal wall also makes it more difficult to absorb nutrients properly (malabsorption).
ResearchediPositive results in clinical studies, not yet standard treatment
Studies of the gut microbiota (beneficial bacteria in your intestines) in children who have undergone ALL show that it recovers differently than in others. This can affect digestion and immunity for months after treatment.
In case of diarrhea, fluid intake can be very important. With constipation, fiber, exercise, and adequate fluid intake usually help better than medication alone. This should be discussed with your treatment team or dietitian.
Avoiding certain foods
When white blood cells are very low (during intensive chemotherapy), the immune system cannot fight infections well. During this period, some foods are better avoided:
- **Uncooked foods** (certain vegetables and fruits, raw meat, raw eggs)
- **Fermented products** (certain cheeses, raw milk)
- **Foods where bacteria grow easily** (undercooked food, food left open for long periods)
ResearchediPositive results in clinical studies, not yet standard treatment
Food hygiene and safety guidelines for people with severely weakened immunity help prevent food-related infections.
This does not apply to the entire treatment; your treatment team will indicate in which phases this is especially important.
Nausea and vomiting
These are common side effects of chemotherapy. They can cause patients to eat less, leading to malnutrition.
ResearchediPositive results in clinical studies, not yet standard treatment
Anti-nausea medications work for many people, especially if given before chemotherapy. Dietary choices (small portions, cold drinks, ginger in some cultures, avoiding very sweet foods) can help as a supplement.
When vomiting is severe, fluids can be given intravenously. It is important to report this to your team.
Lipodystrophy and long-term nutritional consequences
Several years after treatment ends, certain long-term effects may occur, particularly in patients who have undergone stem cell transplantation. One of these is partial lipodystrophy: a change in how the body stores and uses fat.
ResearchediPositive results in clinical studies, not yet standard treatment
Lipodystrophy after stem cell transplantation can have consequences for metabolism and body composition, and sometimes requires guidance around nutrition and exercise.
This is a long-term effect that should be discussed with your doctor at follow-up appointments.
Personalized adjustments: the role of the dietitian
Nutrition during and after ALL is very individual. What one person tolerates well can be impossible for another.
ResearchediPositive results in clinical studies, not yet standard treatment
Research shows that guidance from a specialized dietitian improves patients' nutritional status and well-being.
A dietitian can help with:
- Choosing food that you can eat and what feels good
- Preventing or addressing malnutrition
- Dealing with taste changes
- Understanding nutritional interactions with medicines
- Safe nutrition when your immune system is low
This is not self-help; regular contact with your treatment team and dietitian is essential.
Interactions between nutrition and medication
Some targeted treatments for ALL may interact with certain foods. This can affect how well the medication works or how it is absorbed.
ResearchediPositive results in clinical studies, not yet standard treatment
Some medications (such as certain tyrosine kinase inhibitors) work better when taken on an empty stomach; others work better with food. Your doctor will provide clear instructions for this.
Also, certain drinks (such as grapefruit juice) can change how medications work. Ask your doctor about this if you have foods or drinks that you use regularly.
Preventing malnutrition
Malnutrition can slow recovery and worsen side effects. This is a common problem during intensive chemotherapy.
ResearchediPositive results in clinical studies, not yet standard treatment
Research shows that early attention to nutrition, including nutritional supplements where necessary, helps prevent severe malnutrition.
This may mean that nutritional supplements (meal replacements, powder formulas) are needed, or sometimes even feeding through a tube. These are not something to feel ashamed about; they are a medical tool just like medicines.
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_This information never replaces a doctor's judgment. Always discuss your situation with your own healthcare provider._