# Appetite Loss With Cancer: How to Eat Again

> Learn how to improve appetite during cancer, manage nausea, and maintain strength during treatment with nutrition tips, a doctor's advice, and warning signs.

- URL: https://celitel.online/en/blog/appetit-pri-onkologii/
- Author: Dr. Boris Wydoff — https://celitel.online/en/about/
- Published: 2026-10-20
- Language: en

Loss of appetite with cancer can be caused by the disease itself, treatment side effects, nausea, pain, or changes in taste. Right now, try offering yourself a small portion of your favorite food, drinking between meals, and choosing foods that are easier to tolerate. If you are losing weight or finding it increasingly difficult to eat, tell your oncologist. Nutrition helps you maintain strength, but the underlying cause of the problem needs to be identified.

## Why Does Cancer Cause Loss of Appetite?

Loss of appetite is a common problem for people with cancer. Sometimes, a person understands that their body needs food but feels no hunger when looking at a plate. In other cases, food becomes unpleasant, familiar dishes seem tasteless or smell bad, and just a few spoonfuls create a feeling of fullness.

There can be several reasons. Appetite may be affected by the tumor itself, chemotherapy and other treatments, nausea, vomiting, constipation, diarrhea, dry mouth, painful mouth sores, and difficulty swallowing. Fatigue, anxiety, pain, and low mood can also play a role.

Eating difficulties are particularly common with cancers affecting the digestive system and the organs of the head and neck. However, loss of appetite can occur with any type of cancer. This symptom alone cannot tell you where a tumor is located or what stage the disease has reached.

Sometimes, a person continues eating their usual amount but still loses weight and muscle mass. This can happen because of changes in metabolism and increased nutritional needs. Doctors call severe wasting associated with cancer cachexia. It differs from ordinary weight loss and requires a separate medical assessment.

## How Can You Tell If Your Appetite Has Really Decreased?

Poor appetite with cancer does not always mean refusing food altogether. You may eat less than usual, skip meals, feel full quickly, or choose only a few foods that do not make you feel uncomfortable. Sometimes, even deciding what to cook becomes difficult.

Pay attention to indirect signs, too: your clothes become looser, everyday activities feel more tiring, you feel weak, or prepared meals remain untouched. It can help to record what you manage to eat and drink each day and track changes in your weight. These observations can help your doctor and a clinical dietitian choose the right support.

Can you still have an appetite with cancer? Yes. Some people retain their appetite, while others notice significant changes at different stages of the disease and treatment. Even a good appetite with cancer does not always mean your body is getting enough nutrients. For example, you may eat regularly but still lose weight.

Increased appetite can also occur with cancer. It may accompany certain treatments, including steroid medications, or develop alongside hormonal changes. If your appetite increases sharply, your weight rises quickly, or you develop swelling, tell your doctor so they can investigate the possible cause.

## How to Improve Appetite With Cancer Through Nutrition

When you do not feel like eating, the main goal is not to force yourself to finish a large plate of food. It is to find a way to get enough energy and protein regularly. During treatment, your nutritional needs may differ from what you normally consider a healthy diet. Strict restrictions intended for weight loss may therefore be inappropriate during this period.

Try the following approaches, taking into account which foods you tolerate and the recommendations of your medical team.

- **Choose small portions with high nutritional value.** If a regular lunch feels too large, divide it into several smaller meals throughout the day. Add sources of protein and energy that you tolerate well, such as eggs, cottage cheese, yogurt, cheese, legumes, or nut butter, if suitable for you.
- **Try liquid foods when solid food feels unappealing.** Smoothies, milkshakes, puréed soups, and other nourishing drinks can sometimes be easier to consume than a full meal. If necessary, your doctor or dietitian can recommend specialized medical nutrition products.
- **Drink mainly between meals.** Drinking large amounts immediately before eating can increase the feeling of fullness. However, getting enough fluids is important, especially if you have vomiting or diarrhea. The right amount depends on your kidney and heart function and other health factors.
- **Make food available in advance.** When you have little energy for cooking, prepared portions, frozen meals, and simple foods that require little preparation can help. You can ask family members or friends to help with shopping and cooking.

If the smell of hot food bothers you, try dishes that can be served cold, provided they are safe to eat. When your sense of taste changes, trying a different recipe or substituting another food may sometimes help. If your mouth is sore, choose soft foods that do not irritate the lining of your mouth.

You do not need to aim for a perfect menu every day. During treatment, it is more important to find foods you can tolerate and get enough nutrition than to follow a universal list of restrictions. If you cannot maintain adequate nutrition on your own, ask your oncologist for a referral to a clinical dietitian.

## My Advice: My Approach to Supporting Appetite

**First, do not blame yourself for having a poor appetite, and return to eating calmly.** In my books, I specifically discuss a mistake many people make: someone slips up, eats something they had not planned to eat, or breaks their usual routine, and then starts criticizing themselves. I recommend a different approach: calmly return to your next meal without turning eating into a battle with yourself. When you have almost no appetite, it is especially important not to add guilt to your physical discomfort. I see a calm mind as one of the foundations of everyday well-being.

**Second, pay attention to how your stomach handles food.** In my books, I associate heaviness after meals, bloating, and sleepiness with the digestive system having to deal with unsuitable food combinations. I favor the idea of food combining and believe that simpler meals may feel easier to tolerate. If you feel heavy after a large portion, I advise against forcing yourself to eat more to stock up for later. Instead, discuss with your doctor how to make meals more comfortable. At the same time, I do not recommend eliminating entire food groups to follow my system if doing so makes it harder to get enough nutrition.

**Third, I see vegetable juices as an addition to food, not a replacement for it.** My approach includes combinations of carrot and spinach, as well as carrot, beetroot, and cucumber. I see these drinks as a way to add variety to the diet when familiar foods feel heavy. However, I do not claim that juice can restore appetite with cancer. If nausea, diarrhea, or other side effects make eating difficult, the first step is to identify the cause with your treating team. Juice may not be suitable for everyone.

**Fourth, maintain gentle movement and a calm outlook.** In my books, I associate inactivity and feeling cold all the time with poorer well-being, while I view warmth and movement as ways to support comfort. So, if your energy allows, I would choose a short walk without forcing yourself. However, I do not recommend pushing through severe weakness just to be physically active.

It is important to distinguish my naturopathic perspective from medical evidence. Doctors associate loss of appetite with cancer, among other things, with treatment, nausea, pain, and changes in taste. This is why persistent appetite loss calls for help from an oncologist and a clinical dietitian.

## What to Avoid During Chemotherapy Without Your Doctor's Approval

Even natural foods and supplements can interact with anticancer medicines. During chemotherapy and radiation therapy, you should not start taking concentrated herbal products or high doses of vitamins and other antioxidants on your own.

**It is especially important to avoid the following unless your oncologist has approved them:**

- **St. John's wort.** It can change the concentration of certain medicines in the body, including the way anticancer drugs work.
- **Grapefruit and grapefruit juice.** They can alter the concentration of certain medicines, so you should check whether they are suitable for your specific treatment regimen.
- **High doses of antioxidants.** Taking large doses of vitamins and similar supplements without medical guidance may be inadvisable during chemotherapy and radiation therapy.
- **Concentrated herbal products and extracts.** Their ingredients and interactions with medicines may differ from those of ordinary foods.

This does not mean that all fruits and vegetables are forbidden during treatment. Ordinary fruits and vegetables do not automatically need to be excluded, but you should choose them according to your tolerance, the condition of your mouth and digestive tract, and your risk of foodborne infections. If your immune system is weakened, following food storage and preparation safety guidelines is particularly important.

Do not start taking appetite stimulants on your own. If your nutritional intake remains inadequate, your doctor can assess whether medication, specialized nutritional drinks, or other forms of support may be appropriate.

## When to See a Doctor

Some symptoms in people with cancer require urgent medical attention, regardless of how much their appetite has decreased.

**Contact your oncology team immediately or call emergency services, depending on the severity of your condition, if you experience:**

- A temperature of 38 °C or higher, or chills during chemotherapy. This may indicate a dangerous infection when your white blood cell count is low. Contact your oncologist immediately and do not try to bring the fever down on your own before receiving medical instructions.
- Shortness of breath, chest pain, or sudden swelling in one leg.
- Vomiting that continues for more than a day, or an inability to drink and keep fluids down.
- Blood in your stool or vomit, or black stools.
- Fainting or a rapid heartbeat, especially together with severe weakness or dizziness.

**Make an appointment with your doctor soon if:**

- Your appetite has noticeably decreased or you have started losing weight.
- Nausea, constipation, diarrhea, or changes in taste make it difficult to eat normally.
- Swallowing has become painful, you have mouth sores, or you experience significant dryness.
- You regularly feel full after just a few spoonfuls.
- Anxiety, low mood, pain, or fatigue make it difficult to eat or prepare food.

Do not wait until your weight loss becomes severe. Your oncologist can assess the cause, adjust treatment to manage side effects, and involve a dietitian if needed. If ordinary food is not enough, additional forms of nutritional support are available and can be tailored to your needs.

## How to Restore Appetite With Bowel Cancer

Eating difficulties can be particularly noticeable with tumors of the bowel and other digestive organs. Certain foods may become harder to tolerate, and you may experience early fullness, nausea, changes in bowel movements, or pain after eating. The right diet depends not only on the location of the tumor but also on any surgery you have undergone, complications, and the stage of treatment.

If you suspect a bowel obstruction, for example, if you develop worsening abdominal pain, bloating, vomiting, and an inability to pass stool or gas, you need urgent medical assessment. Do not try to resolve the problem with juices, increased fiber intake, or home bowel cleansing.

After surgery or when specific dietary restrictions apply, your doctor may recommend temporarily changing the texture and composition of your food. In some cases, soft foods are better tolerated; in others, an individualized diet is needed to account for how your bowel functions. Do not introduce a strict diet or eliminate entire food groups on your own.

Read more about my approach to this topic on the [Cancer](/health/onkologiya/) page.

## From the Editorial Team

This article draws on the books of Dr. Boris Wydoff and general medical information about nutrition during cancer. It is for informational purposes only, does not replace a doctor's consultation, and should not be used as a reason to change prescribed treatment. Individual dietary recommendations should be discussed with your oncologist.

Medical information: [NCI (National Cancer Institute)](https://www.cancer.gov/about-cancer/treatment/side-effects/appetite-loss), [NCI (National Cancer Institute)](https://www.cancer.gov/about-cancer/treatment/side-effects/appetite-loss/nutrition-pdq).

## FAQ

**Q: Why can cancer cause a loss of appetite?**
A: The desire to eat can be affected by the disease, treatment side effects, pain, nausea, and changes in taste.

**Q: How should I eat if I have no appetite at all?**
A: Discuss small portions of nourishing food, liquid meals, and additional ways to meet your energy needs with your doctor.

**Q: What should I do if I am losing weight quickly because of cancer?**
A: Tell your oncologist as soon as possible. Weight loss may indicate inadequate nutrition or other changes in your body.

**Q: Can I drink vegetable juices if I have cancer?**
A: They can sometimes be included in your diet, but you should discuss their compatibility with your treatment and any dietary restrictions with your doctor.

**Q: Why do I feel full so quickly during treatment?**
A: This feeling may be a treatment side effect or a sign of digestive problems. The cause should be medically assessed.

**Q: Can I take products to increase my appetite?**
A: Some medicines are prescribed for this purpose. Your doctor will assess the cause of your appetite loss and any possible risks.

**Q: What should I do if food makes me feel nauseated?**
A: Tell your medical team about the symptom and discuss ways to relieve nausea and support your nutritional intake.

**Q: Should I force myself to finish every portion?**
A: You should not turn eating into a struggle, but it is important to work with your doctor to find a way to get enough nutrients.


_Educational content; it does not replace medical advice._