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Did You Know That Most Cancers Can Be Linked To Nutrition Deficiency?
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Overview of Nutrition in Cancer Care
Cancer and cancer treatments may cause nutrition-related
side effects.
The diet is an important part of cancer treatment. Eating
the right kinds of foods before, during, and after treatment
can help the patient feel better and stay stronger. To ensure
proper nutrition, a person has to eat and drink enough of
the foods that contain key nutrients (vitamins, minerals,
protein, carbohydrates, fat, and water). For many patients,
however, some side effects of cancer and cancer treatments
make it difficult to eat well. Symptoms that interfere with
eating include anorexia, nausea, vomiting, diarrhea, constipation,
mouth sores, trouble with swallowing, and pain. Appetite,
taste, smell, and the ability to eat enough food or absorb
the nutrients from food may be affected.
Malnutrition (lack of key nutrients) can result, causing
the patient to be weak, tired, and unable to resist infections
or withstand cancer therapies. Eating too little protein
and calories is the most common nutrition problem facing
many cancer patients. Protein and calories are important
for healing, fighting infection, and providing energy.
Anorexia and cachexia are common causes of malnutrition
in cancer patients.
Anorexia (the loss of appetite or desire to eat) is a common
symptom in people with cancer. Anorexia may occur early
in the disease or later, when the tumor grows and spreads.
Some patients may have anorexia when they are diagnosed
with cancer. Almost all patients who have widespread cancer
will develop anorexia. Anorexia is the most common cause
of malnutrition in cancer patients.
Cachexia is a wasting syndrome that causes weakness and
a loss of weight, fat, and muscle. It commonly occurs in
patients with tumors of the lung, pancreas, and upper gastrointestinal
tract and less often in patients with breast cancer or lower
gastrointestinal cancer. Anorexia and cachexia often occur
together. Weight loss can be caused by eating fewer calories,
using more calories, or a combination of the two. Cachexia
can occur in people who are eating enough, but who cannot
absorb the nutrients. Cachexia is not related to the tumor
size, type, or extent. Cancer cachexia is not the same as
starvation. A healthy person's body can adjust to starvation
by slowing down its use of nutrients, but in cancer patients,
the body does not make this adjustment.
Good eating habits during cancer care help the patient
cope with the effects of the cancer and its treatment.
Nutrition therapy can help cancer patients get the nutrients
needed to maintain body weight and strength, prevent body
tissue from breaking down, rebuild tissue, and fight infection.
Eating guidelines for cancer patients can be very different
from the usual suggestions for healthful eating. Nutrition
recommendations for cancer patients are designed to help
the patient cope with the effects of the cancer and its
treatment. Some cancer treatments are more effective if
the patient is well nourished and getting enough calories
and protein in the diet. People who eat well during cancer
treatment may even be able to handle higher doses of certain
treatments. Being well-nourished has been linked to a better
prognosis (chance of recovery).
Reference citations in some PDQ Supportive Care information
summaries may include links to external Web sites that are
operated by individuals or organizations for the purpose
of marketing or advocating the use of specific treatments
or products. These reference citations are included for
informational purposes only. Their inclusion should not
be viewed as an endorsement of the content of the Web sites
or of any treatment or product by the PDQ Supportive Care
Editorial Board or the National Cancer Institute (NCI).
http://www.cancer.gov/
cancerinfo/pdq/supportivecare/nutrition
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