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Contemporary Oncology/Współczesna Onkologia
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Original paper

Assessment of dietary intake and sociodemographic status of patients with lung cancer

Katarzyna Zabłocka
,
Marcin Gołecki
,
Rafał Ilow
,
Irena Porębska
,
Monika Kosacka
,
Magdalena Bzdok
,
Adam Rzechonek
,
Aleksandra Kamińska
,
Renata Jankowska
,
Jadwiga Biernat

Contemporary Oncology (2011) vol. 15; 2 (118–123)
Online publish date: 2011/04/29
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Background

Poland is one of the countries with the highest rates of mortality and morbidity from lung cancer [1]. There were revealed many risk factors playing a key role in the development of this disease. Cigarette smoking and exposure to harmful environmental factors such as carcinogens in the workplace, radon radiation and toxic chemical substances are very important risk factors, but apart from them, imbalanced nutrition can also play a crucial role in lung cancer aetiology. Previously performed studies indicate that high-fat and high-energy diets can accelerate the risk of lung cancer development [3]. It was also claimed that supply of all food ingredients in accordance to demands of the body can reduce the likelihood of lung cancer development [4]. Everyday consumption of a variety of vegetables and fruit rich in vitamin C, carotenoids and other oxidants is very important because these biologically active substances can protect cells against the radical species from tobacco smoke [5]. Imbalanced diet can contribute to occurrence of the disease in about 10-30% of cases [2].

The relationship between the occurrence of lung cancer and the level of education or kind of work is known [6, 7]. People of worse sociodemographic status are in the group with high risk of this disease because of their lifestyle [8].

Material and methods

Fourty-four patients (15 women and 29 men) from the Department and Clinic of Pulmonology and Lung Cancers were recruited for this study between May 2007 and June 2008. Nutritional assessment and sociodemographic status characterisation were performed by experienced staff. The dietary intake of patients was assessed using dietary recall from 72 hours before the study. For clarification of the size of portion consumed in meals, “Album fotografii produktów i potraw” was used [9]. Energy value and content of protein, carbohydrates, dietary fibre, total fats, cholesterol, fatty acids, minerals and vitamins were calculated by Nutritionist IV (First Data Bank, USA), a computer program with the Polish database performed by Kunachowicz et al. [10]. The results obtained for the individuals engaged in this study were compared to recommended dietary allowances (RDA) in Poland [11]. The following recommendations for energy supply from fatty acids were adopted in this study: saturated fatty acids – 8% of energy intake, monounsaturated fatty acids (MUFA) – 15% and polyunsaturated fatty acids (PUFA) – 7%. The intake of 30 γ of dietary fibre per day was found to be recommended in this study.

We decided to use RDA and recommendations for healthy people because the dietary recall concerned the period of time before the diagnosis of lung cancer.

We also performed sociodemographic and smoking status assessment using a questionnaire

made in the Chair and Department of Food Science and Dietetics. Educational level, place of living, type of family and number of cigarettes were included in this questionnaire.

Statistical analysis was performed with Statistica 8.0. To compare female and male attitudes to cigarette smoking, 2 was used. Statistical significance was accepted at p < 0.05.

Results

Sociodemographic status of recruited lung cancer patients

The characteristics of lung cancer patients’ sociodemographic status are presented in Table 1. The mean age of all patients was 61.2 years but women were younger than men: 54.6 years vs 64.6 years. Most recruited patients (70.5%) were married, 18.2% were widows or widowers, and a few of them were divorced or in an open relationship. There was no difference in marital status between men and women. 38.6% of all patients lived with their wife/husband, children and grandchildren. A similar percentage of the group lived only with their wife/husband. No person was living in a care institution. More than 60% of patients lived in a small town, 11.4% lived in big cities, and 25% were rural residents. Every third person had a vocational education, a similar percentage had basic education and only 6.8% were well educated. A metaanalysis of 64 studies from the last two years performed by Sidorchuk et al. [6] indicated an inverse correlation between the level of education and the risk of lung cancer. It shows that the type of work, especially of people with lower education, can influence the likelihood of lung cancer development.

The information about smoking cigarettes is presented in Table 2 and 3. There was no difference between women and men in smoking status. All recruited people were addicted to smoking. 75% of them smoked in the past and every fourth patient still smoked. Up to 45% of men smoked more than 20 cigarettes per day, while only about 7% of women did so. The highest percentage of women smoked 5-20 cigarettes per day. Cigarette smoking is the main cause of lung cancer development but it changes nutritional habits also. A metaanalysis of studies performed in 15 countries indicated significant differences in nutritional habits between smokers and non-smokers. People addicted to smoking consume more energy, total fat, saturated fatty acids, cholesterol and alcohol than non-smokers. They also supply less dietary fibre, vitamin C, vitamin E and -carotene in their diet [12].

Nutritional assessment of recruited patients in period before lung cancer diagnosis

Energy value and mean content of nutrients in daily food ration of men and women are presented in Table 4. The energy supply was almost equal to the recommended dietary allowance (RDA) for men and women. Females and males consumed on average 92% of proper amounts of energy, but individually only 8% of women and a similar percentage of men covered the energy needs properly. Almost every fourth man provided about 75-90% of energy RDA. A similar percentage of men supplied about 50-75% of energy RDA but every sixth male daily food ration provided only about 25-50% of energy RDA. In the female group two thirds of them provided less than 75% RDA of energy. The high percentage of patients who did not cover energy needs could result from loss of appetite caused by cigarette smoking and bad nutritional habits or could be a symptom of developing cancer [13].

The assessment of the structure of energy supply by macronutrients indicated that the average daily food ration contained 14% of energy from protein and it was correct. Carbohydrates provided 48% of energy and total fat covered 38% of daily energy consumption. Imbalanced contribution of macronutrients to energy coverage resulting from high intake of fat is a well-known factor of lung cancer [14].

In this study it was found that average content of protein in the daily food ration did not meet RDA. Only about every six recruited patients consumed proper amounts of this nutrient. The results indicate that patients supplied carbohydrates in their daily food ration below the recommendation (female – 78%, male – 73% RDA).

There was also low consumption of dietary fibre. In the average daily food ration the content of dietary fibre did not meet RDA. Females consumed 65% of RDA of this food ingredient and males consumed only about 50%. Only 7% of all male patients consumed dietary fibre in proper amounts. It was found that insufficient intake of dietary fibre can accelerate the problems with defecation, especially during opioids intake. Those drugs are very often used during palliative care of terminally ill patients [15].

In all-day meals dietary fat intake was also exceeded. Females and males consumed respectively 25% and 36% more of this nutrient than RDA. About 40% of females and only 7% of males ate total dietary fat in proper amounts. In this study it was found that cancer patients consumed high amounts of saturated fatty acids (SFA). Average daily intake of that nutrient by recruited women and men was about 170% RDA. Only about 14% of males ate saturated fatty acids in proper amounts. Meat, its preparations and high-fat dairy products are rich sources of SFA. The excessive consumption of animal products causes a high percentage of energy from SFA and it can influence cancer development, including lung cancer. Studies performed by Lam et al. [16] indicated a positive correlation between meat consumption and risk of lung cancer.

In contrast to high intake of SFA, the consumption of polyunsaturated fatty acids (PUFA) was below the requirements. In the daily food ration every third person provided PUFA 50-75% RDA and 15% of female and male patients met 25-50% RDA of these fatty acids. Insufficient intake of n-3-PUFA is unsatisfying and can increase the risk of lung cancer development. n-3-PUFA have an anti-inflammatory effect and decrease the synthesis of prostaglandin E2. These fatty acids can also inhibit the expression of oncogenes coding transcription factors: AP1 transcription factor or Ras protein [17].

In this study we recorded the adequate intake of monounsaturated fatty acids (MUFA). The mean RDA coverage for MUFA in females was 97% of RDA and in males 96% of RDA. Simultaneously we found that only 14% of male and 8% of female patients consumed MUFA in adequate amounts and every fourth patient consumed excessive amounts of MUFA. The rest of the respondents ate these nutrients below the recommendation. The proper supply of MUFA appears to be relevant in protecting against lung cancer development. Fortes et al. [18] assessed the impact of a Mediterranean diet on the risk of lung cancer and indicated that high supply of dietary MUFA from olive oil is a positive dietary factor protecting against lung cancer.

The mean cholesterol intake was similar in the female and male group. It was found that 53% of females consumed less than 255 mg of cholesterol. The proper cholesterol consumption, less than 300 mg per day, is desirable because it reduces the probability of lung cancer development. It is expected that high amounts of dietary cholesterol in the daily food ration may increase the risk of lung cancer, but Smith-Warner et al. [19] found in a prospective study that there was no significant correlation between high consumption of cholesterol and lung cancer risk.

The assessment of mineral contents in the daily food ration of recruited patients indicated differences in RDA coverage for these nutrients. There were also differences between female and male patients.

The average contents of Cu in male and female daily food rations met about 55% of the estimated RDA. The insufficient intake of this mineral results in weaker integrity of DNA and induction of early stages of cancerogenesis. Cu is a cofactor for enzymes including Cu-Zn-superoxide dismutase and DNA repair proteins, which can protect cells against reactive oxygen species and DNA damage, especially in current smokers [20].

Insufficient average intake of Fe was observed only in female patients. The average female daily food rations provided Fe below RDA (73%). Males consumed excessive amounts of this mineral. The average recorded amounts of Fe in male daily food rations reached 121% of RDA. Only every fifth male consumed appropriate quantities of this element. As was found in a prospective, cohort study, the excessive amounts of dietary haem iron with intensive intake of vitamin C (more than 500 mg/day) can be a predictive factor for lung cancer development in relation to increased prooxidative processes [21].

Mg and Zn deficiency were observed in male daily food rations. They provided these nutrients in 68% and 67% of the RDA, respectively. In female daily food rations no deficiencies of magnesium and zinc were observed. The average intake of these elements was in the range 90-110% of RDA but none of the surveyed women provided proper quantities of these elements. Almost 80% of females supplied less than 260 mg of magnesium per day and about 70% of females provided insufficient amounts of zinc. Inadequate intake of dietary magnesium is very unhealthy especially during platinum analogue therapy. These cytostatics may induce hypomagnesaemia in nearly 90% of the patients because of damage of the proximal and distal tubules, resulting in nephrotoxicity [22]. Too small amounts of this mineral in the diet may intensify drug-induced hypomagnesaemia and lead to neuromuscular hyperexcitability, tachycardia, loss of appetite, vomiting, diarrhoea and weakness [23].

The intake of potassium in the mean male daily food ration was 89% of RDA. Average intake of this mineral in female daily food rations was similar and met 90% of RDA. Surveyed women provided higher amounts of calcium than men (809.7 mg vs 639.6 mg per day). Almost every third women consumed proper amounts of Ca. Men provided Ca in about 80% of RDA. The male and female mean daily food ration covered more than 150% of RDA of phosphorus. Amounts of Na were also exceeded: 290% of RDA in women and 339% of RDA in men. The incorrect supply of minerals is very disadvantageous for cancer patients during treatment because absorption in the small intestine is impaired. Many cytostatics, including cisplatin (often used in the treatment of lung cancer), induce persistent nausea and vomiting. In some cases they may last for almost a week, causing dehydration and electrolyte disturbances [24].

The average content of vitamin A, C and E in all patient daily food rations exceeded RDA for these vitamins, but the mean supply of vitamin C and E in male daily food rations was only slightly excessive. The average supply of vitamin A in all patient diets was strongly excessive. Females consumed vitamin A in average amounts exceeding 200% of RDA but male daily food rations provided average amounts of this vitamin more than 400% of RDA. Recruited patients were current or former smokers exposed to high amounts of reactive oxygen species. These harmful compounds can be partly eliminated by dietary antioxidants such as antioxidant vitamins [25]. However, it is not allowed to complement the dietary deficiencies with supplements because excessive amounts of antioxidants can lead to greater risk of lung cancer development [26].

There was an insufficient content of thiamine in the average patient daily food ration. The mean vitamin B1 consumption in the studied cancer patient group met 87% (female) and 80% (male) of estimated RDA. There was also insufficient average intake of riboflavin and pyridoxine but only in the male daily food ration: 84% and 73% of RDA, respectively. The mean intake of thiamine and pyridoxine met RDA but niacin consumption was too low. Women consume this vitamin in amounts covering 80% of RDA. Men consumed an adequate quantity of niacin.

Conclusions

1. Incorrect contribution of macronutrients in energy coverage resulted from overconsumption of total fat and insufficient intake of carbohydrates.

2. The average daily food ration provided too high amounts of saturated fatty acids while intake of polyunsaturated fatty acids was below the dietary recommendation.

3. The average daily food ration provided too small amounts of B vitamins in comparison with RDA.

4. Wrong nutritional habits connected with smoking addiction and also with low educational level are strong risk factors predisposing to the development of lung cancer.

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Address for correspondence

Katarzyna Zabłocka

Chair and Department of Food Science and Dietetics

Wroclaw Medical University

pl. Nankiera 1

50-140 Wrocław
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