Taste Changes, Nausea & Appetite Loss During Chemotherapy: A Dietitian's Guide

If food suddenly tastes metallic, everything smells overwhelming, or the thought of eating has become exhausting rather than enjoyable, you are not imagining it — and you are far from alone. These are some of the most common, and most under-discussed, side effects of cancer treatment, and they can have a real impact on how well someone is able to eat during a period when their body needs nutrition the most.

How common are taste changes, nausea and appetite loss during chemotherapy really?

Very. Taste and smell changes can develop at any point before, during, or for up to a year after treatment finishes, and they're thought to affect a large proportion of people going through chemotherapy and radiotherapy. When taste changes take hold, they can reduce overall food intake by up to a quarter — which, over weeks of treatment, adds up to a meaningful nutritional shortfall if it isn't actively managed.

This matters clinically as well as for quality of life. Reduced intake during treatment contributes to the muscle and weight loss patterns dietitians call cancer-related malnutrition, which is linked to poorer treatment tolerance, slower recovery and worse outcomes. The good news is that most taste, smell and appetite-related side effects can be worked around with the right strategies — it's rarely a case of "just eat more," and much more about eating differently.

Taste changes: practical strategies

Taste changes during chemotherapy commonly show up as a persistent metallic taste, a dulled sense of flavour, or specific foods (often meat, tea or coffee) suddenly tasting unpleasant or "off."

What tends to help:

• Switch metal for plastic or bamboo cutlery and non-metal cooking pans if you notice a metallic taste — this genuinely reduces the sensation for many people

• Try tart or acidic flavours — lemon, lime, vinegar-based dressings, or pickled foods can cut through a dulled or metallic palate

• Marinate meat and swap protein sources if red meat tastes unpleasant — try chicken, fish, eggs, dairy or plant proteins like tofu and lentils instead

• Serve food cold or at room temperature rather than hot, as this can reduce the intensity of both taste and smell

• Rinse your mouth with a bicarbonate-of-soda and salt water rinse before eating, which some people find resets taste perception temporarily

• Use herbs, spices and stronger seasoning than usual — bland food is often less palatable when taste is already dulled, not more

  
  

Nausea: eating around it, not through it

Nausea doesn't respond well to being ignored, and it doesn't respond well to forcing large meals either. The aim during a nauseous patch is to keep something going in, little and often, rather than maintaining "normal" meal patterns.

What tends to help:

• Small, frequent portions — five or six small amounts through the day is usually more manageable than three full meals

• Dry, plain, starchy foods first thing in the morning (dry toast, crackers, plain rice cakes) before nausea has fully set in

• Cold or room-temperature foods again tend to be better tolerated than hot food, partly because they release less aroma

• Ginger — in tea, crystallised ginger, or ginger biscuits — has reasonable evidence behind it for mild nausea relief

• Sip fluids between meals rather than with them, as a full stomach alongside fluids can worsen nausea for some people

• Take anti-sickness medication as prescribed and on schedule, rather than waiting until nausea is severe — it works far better as prevention than as rescue

If nausea is severe, persistent, or you're unable to keep fluids down, this needs medical attention rather than dietary management alone — contact your oncology team or the 24-hour treatment helpline you'll have been given.

Nausea Relief Protocol

Buy Now

Appetite loss: lowering the bar, not raising it

When appetite disappears, the instinct is often to push harder — bigger meals, more willpower. In practice, the opposite approach usually works better.

What tends to help:

• Fortify what you can manage, rather than trying to eat more volume. Adding butter, oil, cheese, milk powder or cream to foods you already tolerate boosts calories and protein without needing a bigger plate

• Nutrient-dense drinks — smoothies, milky drinks, or oral nutritional supplement drinks (available on prescription via your GP or oncology team) can deliver a lot of nutrition in a small volume when solid food feels like too much

• Eat when appetite is at its best, even if that's not a "normal" mealtime — for many people this is earlier in the day, before treatment-related fatigue builds

• Keep easy food visible and accessible — appetite can appear briefly and unpredictably, and having something ready to eat immediately makes a real difference

• Involve people around you — appetite loss can be isolating, and eating alongside someone else, even a small amount, can help

Why this deserves proper attention, not just "get through it"

It's understandable that side-effect management can feel like a lower priority than the treatment itself, but nutritional status during active treatment genuinely affects how well someone tolerates it. Cancer treatment can roughly double protein requirements compared with a healthy adult, at exactly the point when eating has become hardest — which is part of why proactive, structured support from a dietitian during treatment (not just at diagnosis) makes such a difference.

If you're a carer reading this on behalf of someone in treatment, know that your role in gently offering food, without pressure, and flagging changes to the clinical team early, is genuinely valuable — this is one of the areas where family support has a measurable impact on how well someone eats.

Getting personalised support during treatment

Side effects vary enormously between people, treatment types and even week to week within the same treatment cycle. A generic list of tips can only take you so far — what actually works is often specific to you, your treatment regimen and the foods you already enjoy.

I offer 1:1 oncology nutrition consultations to help you manage side effects as they arise, and practical, ready-made meal plans built around exactly these challenges — easy to prepare, protein-rich, and designed for the days when cooking from scratch isn't realistic. Book a consultation if you'd like tailored support through treatment.

This article is intended for general information and does not replace individual medical or dietetic advice. Always tell your oncology team about new or worsening symptoms, and seek urgent medical advice if you're unable to keep fluids down.

Sources: Nutricia/Prevalence of Malnutrition in Oncology clinical resource, citing Arends et al., Clinical Nutrition (2017) and Spotten et al., Annals of Oncology (2017) on taste and smell alteration prevalence and impact; British Dietetic Association Oncology Group, patient guidance on taste changes (via Greater Manchester Cancer Alliance); Malnutrition Pathway, cancer resource compiled with consultant oncology dietitians; PMC, UK national survey of healthcare professionals on nutritional advice and care for cancer patients.