# Nutrition in acute lymphoblastic leukemia
Research on nutrition in acute lymphoblastic leukemia (ALL) shows that dietary choices play an important role in managing treatment side effects and supporting body weight and energy supply. The disease itself and intensive chemotherapy, stem cell transplantation, and other treatments can have serious consequences for the stomach and intestines, making eating difficult. This information describes which nutritional approaches are being investigated or used, and what is known about them.
Complete nutrition tips and support for side effects
ProveniIncluded in official guidelines, or approved by EMA or FDA
The hospital and treatment team typically tailor nutritional guidance to the phase and side effects of treatment. This means that nutrition is flexibly adjusted as the intestines and stomach respond to chemotherapy. Many children with ALL experience problems such as nausea, taste changes, dry mouth, esophagitis, or diarrhea, especially during intensive chemotherapy phases.
Research from hospitals shows that children who receive systematic nutritional guidance — tailored to what they can eat without too much discomfort — better maintain their weight and experience less malnutrition. A 2026 study in Pakistan on nutritional changes in children with ALL showed that many children lose weight or gain weight, depending on their treatment phase and how well they can eat. Nutritional quality (not just quantity) proved important for maintaining muscle mass and immune function.
Preventing or addressing both malnutrition and overweight are goals. After treatment, some patients may have long-term changes in appetite or eating behavior.
Gluten-free diet
UnproveniNo scientific evidence that it works
A gluten-free diet — avoiding gluten from grains such as wheat — is sometimes investigated for people with intestinal problems. With ALL, gluten-free eating can help some patients if they have intestinal inflammation or diarrhea, especially if gluten sensitivity is present.
However, there is no specific evidence that a gluten-free diet benefits all patients with ALL. The diet only makes sense if gluten sensitivity has actually been established, and can actually become more complicated if unnecessary restriction is imposed.
Bacterial balance in the intestines: role of nutrition and probiotics
ResearchediPositive results in clinical studies, not yet standard treatment
The bacterial composition in the intestines — the microbiome — changes severely during and after ALL treatment. Research from 2026 on the microbiome in children who had survived ALL showed that their intestinal bacteria were clearly different from those of healthy children, even years after treatment.
Nutrition plays a role in which bacteria thrive. Diet high in fiber (vegetables, fruit, whole grains) supports beneficial intestinal bacteria. Probiotics (viable bacteria as a supplement) are sometimes investigated, but there is still no strong consensus on which types help and when. It is important to align nutritional choices in this area with the treatment team, because certain probiotics can also pose risks for patients with weakened immunity.
Carbohydrate-rich food and rapid energy supply
ProveniIncluded in official guidelines, or approved by EMA or FDA
Patients with ALL need extra energy during intensive treatment. When eating is difficult due to side effects, calorie-enriched drinks, soups, and accessible carbohydrate sources (such as rice, pasta, flour) are often part of daily nutrition. This helps prevent weight loss and provides energy for healing.
Research shows that patients who receive easily digestible, energy-rich food that matches what they can eat maintain their weight better than patients who do not receive targeted support.
Protein-rich food and muscle maintenance
ProveniIncluded in official guidelines, or approved by EMA or FDA
Protein is needed for tissue repair and maintenance of muscle mass, especially because chemotherapy breaks down cells and the body has much to repair. Nutrition with adequate protein (from meat, fish, eggs, dairy products, legumes, nuts) is part of standard guidance.
Research into dietary changes in children with ALL shows that patients who receive adequate protein lose less muscle mass and recover better. This is especially important because some children experience weight loss and need to regain strength by the end of treatment.
Limitation of certain nutrients due to side effects (lactose, fat, fiber)
ProveniIncluded in official guidelines, or approved by EMA or FDA
Depending on intestinal inflammation, diarrhea or absorption problems, dietary adjustments may be needed. This can mean that lactose (from dairy), fat or high fiber is temporarily less well tolerated.
Nutritional advice is usually determined individually by the dietitian based on what the patient can tolerate. This restriction is typically not permanent, but adjusts to the phase of treatment and healing.
Antioxidants and nutrition: caution with certain supplements
ExperimentaliOngoing in study setting, outcome still unknown
Research from 2026 into metabolic patterns in children with ALL showed that certain metabolites and oxidative processes change. This has drawn attention to the question of whether antioxidant-rich foods (vegetables, fruit with vitamins and polyphenols) can be protective.
However: caution is needed with strong antioxidant supplements. Some of these can interfere with chemotherapy effectiveness or stem cell transplantation. Food with natural antioxidants (fresh fruit, vegetables) is generally considered safe, but additional supplements should always be discussed with the treatment team.
Monitoring of weight and nutritional status after stem cell transplantation
ProveniIncluded in official guidelines, or approved by EMA or FDA
Patients undergoing stem cell transplantation for ALL have additional nutritional risks due to graft-versus-host disease (GVHD) of the intestine, which can make eating painful or impossible. Research into late complications after transplantation has shown that some patients can have long-term changes in fat mobilization (lipodystrophy), which affects eating habits and metabolism.
Regular monitoring of weight and nutritional status by nutrition professionals is part of long-term care.
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**Dietary choices in ALL are strongly dependent on the treatment phase, side effects and individual tolerance.** This makes nutrition truly individualized. It is important to discuss any nutrition questions and wishes with your treatment team or a specialized dietitian, especially since certain dietary choices can affect the effectiveness of medications or immune recovery.
_This information never replaces a doctor's judgment. Always discuss your situation with your own healthcare provider._