Hematopoietic Stem Cell Transplant Nutrition

Hematopoietic stem cell transplantation (HSCT) is an intensive treatment for hematologic and some other diseases in which high-dose conditioning chemotherapy or radiotherapy precedes infusion of stem cells. The conditioning regimen, the period of marrow aplasia, and complications such as mucositis and graft-versus-host disease combine to make nutritional support a central part of supportive care during transplantation.

Definition

HSCT nutrition is the clinical nutrition care of patients undergoing hematopoietic stem cell transplantation, addressing the heightened risk of malnutrition created by high-dose conditioning, mucosal toxicity, the period of cytopenia, and transplant-related complications, through nutritional screening, monitoring, and support.

Scope

The topic describes why HSCT poses an unusually high nutritional risk, the phases of the transplant course that affect intake and metabolism, and the role of nutritional assessment and support across that course. It is a reference overview and does not specify feeding routes, formulas, or individualized regimens, which are determined by the transplant team.

Core questions

• Why does hematopoietic stem cell transplantation create a high risk of malnutrition?
• How do the conditioning, aplastic, and recovery phases each affect nutritional needs?
• How is nutritional support integrated into the broader supportive care of transplant patients?

Key concepts

• Conditioning regimen toxicity
• Period of marrow aplasia and cytopenia
• Severe mucositis impairing oral intake
• Enteral and parenteral support in transplantation
• Nutritional monitoring through engraftment and recovery

Mechanisms

Several features of transplantation converge to threaten nutrition. High-dose conditioning damages the gastrointestinal mucosa, frequently producing severe mucositis that limits oral intake; the ensuing period of cytopenia brings infection risk, nausea, and reduced appetite; and complications such as graft-versus-host disease and gut injury can impair absorption. Energy and protein requirements may be elevated during this catabolic period, and intake is often insufficient, creating a window in which nutritional support is commonly required to bridge the gap until mucosal healing and engraftment allow recovery of normal eating.

Clinical relevance

Nutritional status before and during transplantation is associated with how patients tolerate the procedure, and nutritional support is an established component of transplant supportive care alongside infection prophylaxis and symptom control. This entry frames the nutritional dimension of HSCT for reference; the choice and timing of nutritional support are individualized and managed by the transplant multidisciplinary team.

Epidemiology

Tens of thousands of hematopoietic stem cell transplants are performed worldwide each year for leukaemias, lymphomas, myeloma, and other conditions. Significant weight loss and reliance on artificial nutrition are common during the inpatient transplant period, particularly with myeloablative conditioning and when severe mucositis or graft-versus-host disease occurs.

Evidence & guidelines

The EBMT Pediatric Diseases Working Party supportive care report (Nava et al., 2020) addresses nutritional support among the non-infectious supportive care needs of transplant patients, and ESPEN guidance on nutrition in cancer (Arends et al., 2017; Muscaritoli et al., 2021) covers nutritional screening and the use of enteral and parenteral support in this intensive setting.

Debates

Enteral versus parenteral nutrition during transplantation

Severe mucositis historically made parenteral nutrition common in HSCT, but interest has grown in enteral feeding where tolerated for its gut-trophic and infection-related advantages; the balance between routes in different phases and patient groups remains an active question.

Key figures

• Jann Arends
• Selim Corbacioglu
• Maurizio Muscaritoli

Seminal works

• nava-2020-ebmt
• arends-2017-espen

Frequently asked questions

Why is nutrition such a focus during stem cell transplantation specifically?

The high-dose conditioning, the period without normal blood counts, and complications like mucositis and graft-versus-host disease together impair eating, digestion, and absorption far more than most treatments, so deliberate nutritional support is often needed to get through the transplant period.

Is feeding by vein always required during a transplant?

No. Whether enteral (gut) feeding, parenteral (intravenous) feeding, or oral intake is used depends on the severity of mucositis and gut function in each patient and phase, and is decided individually by the transplant team rather than by a fixed rule.