Leukemia and obesity
Extra weight can raise risks; harsh fasting in treatment is dangerous.

01Short answer
02Simple explanation
No harsh starvation.
Watch portions.
Fewer sugary drinks.
With a dietitian.
03Scientific explanation
WCRF/AICR: healthy weight links to long-term risk.
ESPEN: protect muscle — need protein.
Fasting does not replace treatment.
04What happens in the body?
Why it matters
Extra fat can raise other health risks.
Nutrition direction
Vegetables, protein, grains; less fast food.
With leukemia treatment
Sometimes weight loss is planned after a treatment phase.
Questions for your team
Can I lose weight now? Calories? What on steroids?
When two diets clash
One condition's diet can conflict with another's: for example, leukemia needs energy and protein while another illness may call for limits. In such cases the haematologist, the specialist and a dietitian should decide together — don't add restrictions on your own.
Medicines and food
Some foods interact with medicines (for example, grapefruit changes blood levels of several drugs). Steroids can raise blood sugar. Talk to a pharmacist before starting a new food or supplement.
05Four steps
Two teams, one plan, moderation, follow-up.



06Brief
| Topic | Note |
|---|---|
Direction | Vegetables, protein, grains; less fast food. |
Together | Sometimes weight loss is planned after a treatment phase. |
Questions | Can I lose weight now? Calories? What on steroids? |
07Key terms
- Obesity
- Excess fat.
- Portion
- One serving.
- Muscle loss
- If protein too low.
- Dietitian
- Specialist.
08Key points
- Two teams.
- One plan.
- No personal dosing.
- Do not stop treatment.
- Write questions down.
- Diets clash — the doctors decide together.
09Frequently asked questions
Does this diet treat leukemia?
No.
Who decides?
Haematologist and the other doctor together.
Change doses myself?
No.
Will food cure this condition and leukemia?
No. Food supports treatment but does not cure illness.
Who should plan my diet?
Your haematologist, the doctor for the other condition and a dietitian together.
10Questions for your doctor
Take these questions to your appointment. The ones you save are collected on the “My questions” page and stay on this device only.
Does this diet treat leukemia?
Who decides?
Change doses myself?
Will food cure this condition and leukemia?
Who should plan my diet?
12Sources
- Leukemia & Lymphoma Society. Diet Guidelines for Immunosuppressed Patients
- CDC. Safer Food Choices for People With Weakened Immune Systems
- National Cancer Institute. Eating Hints: Before, During, and After Cancer Treatment
- NHS. Food safety
- World Health Organization. Healthy diet fact sheet
- U.S. FDA. Food Safety: What You Need to Know
- Memorial Sloan Kettering Cancer Center. Food Safety During Cancer Treatment
- American Cancer Society. Nutrition for People with Cancer
- ESPEN. ESPEN practical guideline: Clinical Nutrition in cancer (2021)
- USDA. FoodData Central
- World Health Organization. Guideline: Sugars intake for adults and children
- World Health Organization. Salt reduction
- U.S. FDA. Grapefruit Juice and Some Drugs Don't Mix
Direction
Together
Questions