Jeffrey Salazar
While there is no definitive evidence that diet directly causes childhood cancer, nutritional status plays a crucial role in the health outcomes of children with cancer. Undernutrition and malnutrition are common in pediatric cancer patients and can be caused by various factors, including the underlying disease, side effects of cancer treatments, increased metabolic demands, and reduced physical activity. Proper nutrition is essential for children's growth, development, and adequate bone and muscle mass formation. Additionally, certain dietary components may be associated with an increased or decreased risk of cancer, but further research is needed to establish causal relationships.
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What You'll Learn
Nutritional requirements during cancer treatment
Nutritional requirements are an important aspect of cancer treatment, helping patients stay strong and healthy. Good nutrition can aid in recovery, improve quality of life, and reduce the cost of care. However, the nutritional needs of children with cancer are often underestimated, and malnutrition is common.
Children undergoing cancer treatment may experience a decrease in appetite and subsequent weight loss. This can be due to various factors, such as nausea, vomiting, dry mouth, mouth sores, constipation, diarrhoea, and changes in taste caused by the treatment. It is important to address these side effects to ensure the child receives adequate nutrition. Offering smaller, more frequent meals and blander foods can help with decreased appetite. For example, plain meals like bread, pasta, rice, and broth-type soups may be better tolerated. Additionally, serving foods at room temperature may be preferable to hot or cold meals.
To meet their nutritional requirements, children with cancer typically need more protein, carbohydrates, vitamins, minerals, and healthy fats. Protein helps repair tissues, build blood cells, and strengthen the immune system. Good sources of protein include cheese, eggs, milk, yogurt, lean meats, poultry, fish, beans, peanut butter, nuts, lentils, and soy. Carbohydrates provide energy and help maintain organ function. Whole-grain breads and pastas are recommended as they add fiber, which promotes fullness and prevents constipation.
It is generally recommended to avoid dietary supplements, as they can interfere with cancer treatments. Instead, children should obtain their nutrients from food. However, in some cases, supplements may be recommended by a healthcare provider. Maintaining a healthy weight is crucial, and parents should encourage their children to stick to a mealtime schedule with moderate-sized meals and snacks. Exercise can also aid in maintaining weight and improving appetite and digestion.
Overall, the nutritional needs of children with cancer are unique and specialized. Seeking advice from a dietitian or nutritionist is essential to ensure the child receives the necessary nutrients to support their health and recovery during cancer treatment.
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The impact of diet quality on nutritional disorders
Nutritional disorders are common in children undergoing cancer treatment, and their consequences can be severe. Undernutrition in pediatric cancer patients is caused by a combination of factors, including the underlying disease, the host's inflammatory response, the side effects of cancer therapy, and increased metabolic demands. These factors lead to changes in dietary intake, physical activity levels, and the ratio of lean to fat mass, resulting in an altered energy balance.
Children with cancer have an increased need for protein, carbohydrates, vitamins and minerals, and healthy fats. Protein helps the body grow, repair tissues, build blood cells, and replenish the immune system. Carbohydrates provide energy for cells and help maintain organ function. However, maintaining adequate nutrition during cancer treatment can be challenging due to side effects such as vomiting, nausea, diarrhea, changes in taste and smell, and stress.
Cancer treatments such as surgery, radiation therapy, and chemotherapy can also contribute to nutritional disorders. For example, chemotherapy drugs used to treat leukemia have been found to cause oxidative stress, which can enhance the effectiveness of certain chemotherapy regimens but also impact dietary intake. Radiation therapy can cause thyroid function issues, and multimodal treatments can result in metabolic and hormonal alterations, impacting the body's energy balance.
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Cancer treatment and changes in body composition
While studies of human populations have not yet shown definitively that any dietary component causes or protects against cancer, adequate nutrition during cancer treatment plays a decisive role in several clinical outcome measures, such as treatment response, quality of life, and cost of care. Malnutrition in children with cancer should not be accepted at any stage of the disease or tolerated as an inevitable process. Children with cancer have an increased need for protein, carbohydrates, vitamins and minerals, and healthy fats.
Body composition changes in cancer patients have historically been underappreciated because of the limited availability of measurement tools. As a result, the effect of nutritional interventions has primarily focused on changes in body weight, without a clear understanding of changes in specific compartments, such as muscle and adipose tissue. However, as more evidence highlighting the importance of body composition has emerged, it is imperative to apply a more precise evaluation of nutritional status and a more targeted approach to providing nutritional support for cancer patients.
Anthropometric measurements, such as body mass index (BMI), skinfold thickness, and circumference, can be used as proxies for body composition. They are easily available and low cost and are the most commonly used methods in clinical practice. Studies have linked them to various health risks. However, anthropometric measurements do not always correlate with prognosis in cancer patients.
Recent studies have applied radiological assessments to measure specific aspects of body composition, yet reconciling these modern assessment tools with historical anthropometric data remains challenging. These techniques allow for accurate and reliable quantification of the amounts of subcutaneous, visceral, and intramuscular adipose tissue, as well as skeletal muscle tissue. While these studies possess attractive features, their utility in understanding the relationship between cancer outcomes and body composition may be limited to malignancies where imaging is standard in diagnosis and treatment.
Additionally, the interpretation of findings related to weight loss in epidemiological studies is challenging, as intentionality is not typically assessed. Intentional weight loss is usually due to the purposeful adoption of dietary and physical activity practices, while unintentional weight loss is thought to reflect disease progression. Furthermore, weight stability may not be a reliable measure of ideal body composition, as incident sarcopenia and myosteatosis after diagnosis have been reported among weight-stable cancer patients.
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Alcohol consumption and cancer risk
Alcohol consumption is a known cause of cancer. The International Agency for Research on Cancer (IARC) classified alcohol as a Group 1 carcinogen (cancer-causing substance) in 1987, due to sufficient evidence that it causes cancers of the oral cavity, pharynx, larynx, oesophagus, and liver in people. The National Toxicology Program has also listed the consumption of alcoholic beverages as a known human carcinogen in its Report on Carcinogens since 2000.
The link between alcohol consumption and cancer risk is well-established. Studies have shown that alcohol drinking can increase cancer risk in several ways. Firstly, alcohol can disrupt cell cycles, increase chronic inflammation, and damage DNA. DNA damage can lead to uncontrolled cell growth and the development of cancer. Alcohol can also increase levels of hormones, such as estrogen, which is a known risk factor for breast cancer. Additionally, alcohol makes it easier for the cells in the mouth to absorb carcinogens, increasing the risk of oral cancer, especially when used in combination with tobacco.
The risk of developing cancer increases with the amount of alcohol consumed. Heavy or regular alcohol consumption significantly increases the risk of developing cancers of the oral cavity (excluding the lips), pharynx (throat), larynx (voice box), oesophagus, liver, breast, colon, and rectum. Binge drinking, defined as consuming four or more drinks by women and five or more drinks by men in about two hours, is considered harmful and further increases cancer risk. Even light drinkers are at an increased risk of certain cancers. For example, women who consume one drink per day have a higher risk of breast cancer than those who drink less than one drink per week.
The federal government's Dietary Guidelines for Americans recommend that individuals who do not drink alcohol should not start drinking for any reason. For those who choose to drink alcohol, it is advised to do so in moderation by limiting consumption to two drinks or less per day for men and one drink or less per day for women. Doctors can play a role in cancer prevention by asking patients about their alcohol consumption and offering behavioural counselling to those who drink excessively. Communities can also create social and physical environments that support reduced alcohol consumption to lower cancer risk.
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Artificial sweeteners and cancer
Artificial sweeteners are chemically synthesized substances used as alternatives to sucrose (table sugar) to sweeten foods and beverages. They are many times sweeter than table sugar, so much smaller amounts are needed to create the same level of sweetness. The six artificial sweeteners approved by the US Food and Drug Administration (FDA) as food additives are saccharin, aspartame, acesulfame potassium (acesulfame-K or Ace-K), sucralose, neotame, and advantame.
The safety of these food additives is debated, with conflicting findings regarding their role in the aetiology of various diseases. The World Health Organization's (WHO) International Agency for Research on Cancer (IARC) recently reclassified aspartame as a possible carcinogen, or substance that causes cancer. However, it is important to note that this change in status is based on limited evidence, and more research is needed to confirm this link.
Some studies have suggested a potential association between artificial sweetener intake and an increased risk of certain cancers. For example, one study found a link between the intake of artificially sweetened beverages and an increased risk of kidney cancer in a US cohort of postmenopausal women, while another French cohort study called the NutriNet-Santé Study found that individuals who consumed the greatest amounts of artificial sweeteners had a slightly higher likelihood of developing cancer. However, it is important to interpret these findings with caution, as other studies have yielded inconsistent results. For instance, a European cohort of healthy adults did not find an association between artificially sweetened beverage consumption and kidney cancer.
In laboratory animal studies, the FDA-approved artificial sweeteners have generally not been found to cause cancer or other adverse health effects. While early studies linked the combination of cyclamate and saccharin to the development of bladder cancer in rats, subsequent reviews and evaluations of the data led scientists to conclude that cyclamate does not cause cancer, although it remains banned in the United States.
Overall, while some studies suggest a potential link between artificial sweetener intake and cancer risk, the evidence is not conclusive, and more high-quality research is needed to make strong dietary recommendations. At present, there is no compelling safety data to suggest that any marketed non-sugar sweetener should be avoided in typical consumption amounts.
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Frequently asked questions
There is no evidence that diet causes childhood cancer. However, proper nutrition is essential for children's growth and development, and it plays a decisive role in the clinical outcomes of children with cancer. Children with cancer have specific nutritional needs, and maintaining a healthy weight is important.
Children with cancer have an increased need for protein, carbohydrates, vitamins and minerals, and healthy fats. Protein helps the body repair tissues, build blood cells, and replenish the immune system. Carbohydrates provide energy for cells and help maintain organ function.
Diet can influence the clinical outcomes of children with cancer. Nutritional disorders are common during cancer treatment, and children with cancer are at high risk for developing short-term and long-term nutritional problems. Undernutrition is caused by a combination of factors, including the underlying disease, side-effects of cancer therapy, and increased metabolic demands.
Nutritional problems can be prevented by ensuring adequate nutrition during cancer treatment. It is important to work with a dietitian to determine the best diet for a child with cancer. In general, it is recommended to offer smaller, more frequent meals and to limit salt intake.
