The idea behind keto for cancer
Some tumours depend heavily on glucose, which led researchers to study very-low-carbohydrate diets. Human evidence is still limited, and results differ by cancer type.
What plant-based research shows
Diets high in vegetables, fruit, legumes and whole grains are linked to lower inflammation and better long-term outcomes for several cancers.
Risks to consider
Strict diets can speed up weight and muscle loss during treatment. Any restrictive approach needs close medical supervision.
A personalised middle path
Many patients do best on a whole-food plan that controls refined sugar while keeping protein and energy high enough.
Why researchers are interested in keto
Many cancer cells use glucose heavily, so researchers are studying whether very low-carb diets affect tumour growth. Evidence is still early and mixed.
What a plant-based diet offers
Plant-based patterns are rich in fibre and protective compounds, but must be planned to provide enough protein, B12, iron and calories during treatment.
Risks to consider
Both approaches need supervision.
- Keto can cause weight loss, fatigue and nutrient gaps
- Strict plant diets may lack protein and B12
- Either can be unsuitable during some treatments
Questions to ask your oncology team
Ask whether your treatment affects appetite, digestion or blood sugar, and whether any diet change could interact with your medicines.
Frequently asked questions
Does keto cure cancer?
No. There is no evidence that any diet cures cancer. Diet can support treatment and wellbeing.
Is a plant-based diet safe during chemotherapy?
It can be, as long as protein and calorie needs are met. Plan it with a clinician.
What is the best diet for cancer patients?
One that maintains weight and muscle, manages side effects and suits your treatment — planned individually with your care team.
Written by Dr. Jai Vora. This article is for education only. Speak with your doctor before changing medication, diet or treatment.