Relationship between methylmalonic acid,homocysteine, vitamin B12 intake and status and socio-economic indices,in a subset of participants in the British National Diet and Nutrition Survey of people aged 65 y and over

OBJECTIVE: Assessment of functional vitamin B(12) status in a subset of the respondents in the British National Diet and Nutrition Survey of people aged 65 y and over. SETTING: National Diet and Nutrition Survey: a British nationwide cross-sectional sample of people aged 65 y and over, living either in the community or in institutions such as nursing homes, during one calendar year spanning 1994-1995. METHODS: Methylmalonic acid (MMA) concentrations were measured in plasma samples from 313 subjects (ca 14% of those originally enrolled in the survey). The results were compared with those for serum vitamin B(12), vitamin B(12) intakes and other status and intake estimates and with socio-demographic indices. RESULTS: Of the NDNS participants overall, 20% had serum vitamin B(12) concentrations<150 pmol/l. In the subset studied here, 24% of free-living and 46% of institution-living participants had MMA>0.5 micromol/l. Geometric mean MMA increased with age, from 0.25 micro mol/l in people aged 65-74 y to 0.38 micro mol/l in people aged 85+y. There was little evidence for any gender difference in MMA. It was inversely correlated with serum vitamin B(12) and with red blood cell folate; it was positively correlated directly with total homocysteine, but not significantly with serum folate or with vitamin B(12) intake. Among respondents with high MMA, a subgroup had normal serum vitamin B(12) but higher-than-average plasma urea and creatinine. Socio-demographic co-variates of MMA included receipt of State income benefits, social class of head of household, and educational attainment. These indices were not correlated with serum vitamin B(12). CONCLUSIONS: The progressive increase in MMA with age is metabolic evidence for increasing risk of functional vitamin B(12) deficiency with increasing age in older people. There is evidence that renal function is linked to high MMA in some older people. Age and renal function are thus both important when establishing upper reference limits for MMA. The socio-demographic observations suggest a link between poverty and poor functional vitamin B(12) status in older British people.     

Clostridium difficile colitis in older adults in long-term facilities and the community: do their outcomes differ?

OBJECTIVE: To determine if older adults from long-term care facilities (LTCF) have a greater risk of death than older people in the community after the development of Clostridium difficile (CD) colitis during hospitalization. DESIGN: A retrospective review of medical records from all older hospitalized patients with a confirmed diagnosis of CD colitis from February 1995 to February 1997 at Our Lady of Mercy Medical Center, Bronx, NY, a University hospital of the New York Medical College. METHODS: A total of 108 patients (aged 60-97 yrs.) with a positive diagnosis of CD colitis (EIA of CD cytotoxin A and B) were identified. Residence (nursing home vs. community), sex and age, length of hospital stay, laboratory values, the number, dose, and duration of all antibiotics used, and co-morbid medical conditions were examined as potential risk factors for adverse outcome (mortality). RESULTS: Fifty-two nursing home and 56 older patients living in the community were compared. Outcome (survival vs. death) was equivalent between nursing home (13 of 52 died, 25% death rate) and community elderly (13 of 56 died, 23% death rate). The patients in the nursing home were, on average, 3 years older than community those in the community, but age was not related to outcome in either group. Death occurred significantly more often in LTCF and community patients who received prolonged antibiotic therapy (P = 0.0056) or were prescribed four or more antibiotics (P = 0.036) during hospitalization. Low serum albumin level was found to be a strong predictor of death (P = 0.002). However, nursing home and community elderly had similar mean serum albumin levels (P = 0.2797). Death was also predicted by the use of clindamycin alone (P = 0.046) or penicillin-like antibiotics (excluding cephalosporins) and clindamycin (P = 0.021), or a history of cardiac disease (coronary artery disease or congestive heart failure) (P = 0.022). CONCLUSIONS: Patients from LTCF do not have an increased risk of mortality compared with older people in the community after developing CD colitis during hospitalization. Factors such as low serum albumin, prolonged antibiotic therapy, the number of antibiotics used, use of specific antibiotics, and cardiac disease were significantly related to an increased risk of death in both LTCF and community older adults. Age did not influence outcome in either group of older adults.     

Mild anemia and the risk of falls in older adults from nursing homes and the community

OBJECTIVES: The objectives of this study were to determine if a relationship exists between a history of falls and anemia in older adults and to compare the findings by place of residence. DESIGN: The authors conducted a retrospective and observational study. PARTICIPANTS: One hundred forty-five adults (60-97 years of age) from nursing homes and the community hospitalized for hip fracture over a 2-year period were included in this study. MEASUREMENTS: Laboratory values (hemoglobin [Hb], hematocrit [Hct]), medical history, and demographics were measured. RESULTS: Falls occurred similarly in both nursing home patients and community patients (19% vs. 17%, P=0.785). Nursing home and community patients also had similar Hb (P=0.0899), Hct (P=0.1929), and rates of anemia (P=0.187). Nursing home residents were older (P=0.0188) and had lower serum albumin levels (P=0.0007) than community patients. When the two groups were combined, falls were more common in anemic individuals (30% vs. 13%; P=0.028). Furthermore, those with a history of falls were older (P=0.0447), had lower Hb (P=0.0257) and Hct levels (P=0.0310). After controlling for age, gender, place of residence, and arthritis in a logistic regression model, anemia predicted a threefold increased risk of falls (P=0.041), and a 45% decreased risk of falls was predicted for every 1.0-g/dL increase in Hb (P=0.005). Falls risk increased 7% per year of age (P=0.040), whereas musculoskeletal disease increased the falls risk 3.2-fold, both increases being independent of Hb levels or anemia. Finally, falls were not associated with gender or other comorbidity, nor did these variables alter the falls risk attributed to low Hb or anemia. CONCLUSIONS: These findings suggest a new and potentially important link between anemia and the risk of falls in patients sustaining hip fractures from both nursing homes and the community. Further studies will help determine if this risk is modified or eliminated with treatment of anemia and if the relationship applies to larger samples of older adults in different settings.     

Serum vitamin B12 concentrations and atrophic gastritis in older New Zealanders

OBJECTIVE: To determine the serum vitamin B(12) status of older New Zealanders and to assess the impact of atrophic gastritis on vitamin B(12) status. DESIGN: A cross-sectional nationally representative population-based survey. METHOD: Serum vitamin B(12) concentrations were used to assess vitamin B(12) status. The presence and severity of atrophic gastritis was classified using serum pepsinogen I and II. SUBJECTS: A total of 466 noninstitutionalized urban and rural dwelling New Zealanders aged 65 y or older who participated in the 1997 National Nutrition Survey. RESULTS: The prevalence of deficient (<148 pmol/l) and marginal (148-221 pmol/l) serum vitamin B(12) concentrations was 12 and 28%, respectively. The prevalence of atrophic gastritis was 6.7% (severe 3.1%, mild-moderate 3.6%). While atrophic gastritis increased the relative risk (RR, 95% CI) of having a deficient or marginal serum vitamin B(12) concentration by 21-fold (6-67) and five-fold (1-17), respectively, those who had atrophic gastritis made up only 33 and 6% of the participants with deficient or marginal serum vitamin B(12) concentrations. An intake of vitamin B(12) from food that exceeded the recommended dietary allowance (2.4 mug/day) did not protect against deficient (RR 0.5; 95% CI: 0.2, 1.2) or marginal (RR 0.9; 95% CI: 0.5, 1.7) serum vitamin B(12) status. Vitamin B(12) supplement users had a reduced risk of having deficient and marginal vitamin B(12) status (RR 0.3; 95% CI: 0.1, 0.8). CONCLUSIONS: There is a relatively high prevalence of deficient and marginal serum vitamin B(12) concentrations among older New Zealanders. However, the prevalence of atrophic gastritis was low in the New Zealand elderly compared with other surveys. Although atrophic gastritis was a risk factor for low vitamin B(12) status, it did not fully explain the prevalence of low serum vitamin B(12).     

Serum albumin in older persons: relationship with age and health status.

We analyzed data from 4115 persons aged 71 years and older who had blood drawn at a home visit in three communities to examine the cross-sectional distribution of serum albumin and correlates of hypoalbuminemia. Mean albumin was lower among older persons, from 41.6 g/l in men aged 71-74 years to 38.5 g/l in men 90 years or older, and from 41.1 g/l to 38.9 g/l in women of the same ages, respectively. Hypoalbuminemia (albumin less than 35 g/l) was observed in 3.1% of subjects. Hypoalbuminemia and lower serum albumin were independently associated with anemia, recent diagnosis of cancer, two or more limitations in activities of daily living, residence in a nursing home, heavy cigarette smoking (greater than 1 pack/day), and older age. A 10-year age increment was associated with 0.8 g/l lower serum albumin and odds ratio of 1.56 (95% CI 1.14, 2.13) for hypoalbuminemia after adjusting for demographic factors and health status. Characteristics associated with serum albumin may confound the reported relationship between serum albumin and mortality.     

Is serum albumin a good marker for malnutrition in the physically impaired elderly?

BACKGROUND AND AIMS: Although serum albumin is well known as a marker of nutritional status, it has remained unclear whether impaired physical function affects serum albumin concentrations in older people. We examined whether hypoalbuminemia can be used as a marker of malnutrition in elderly subjects with various levels of physical impairment. METHODS: A total of 262 elderly subjects without acute illness were enrolled from various geriatric settings. For the nutritional assessment, serum albumin, total cholesterol, anthropometric measurements, and subjective global assessment (SGA) were determined. Physical function was evaluated by rating score of activity of daily living (ADL). RESULTS: As a whole, participants' serum albumin levels correlated with various nutritional parameters including anthropometric measurements and levels of serum total cholesterol as well as the SGA evaluation. However, after adjusting for age and gender, serum albumin levels in participants with a low ADL function did not correlate with nutritional parameters. Approximately 80% participants with low ADL function who were evaluated as being well nourished according to SGA evaluation had serum albumin levels lower than 35 g/l. CONCLUSIONS: The utility of serum albumin and the traditional cutoff (35 g/l) in older people with low ADL function is questionable even among those without inflammation.     

Study of the effect of a liquid nutrition supplement on the nutritional status of psycho-geriatric nursing home patients

OBJECTIVES: To evaluate the acceptance of a multinutrient liquid nutrition supplement in psycho-geriatric nursing home patients and the effect on weight, plasma nutrients and activities of daily life. DESIGN: Double-blind, placebo-controlled 12-week intervention study. SETTING: Two nursing homes in Boxtel, The Netherlands. SUBJECTS: Forty-two (body mass index (BMI) <23 kg/m2 for men or <25 kg/m2 for women) psycho-geriatric nursing home patients aged 60 y or over. INTERVENTIONS: Provision with a complete micronutrient-enriched liquid nutrition supplement of 125 ml and 0.6 MJ (135 kcal) or placebo twice daily during daytime between main meals. Study parameters were assessed at 0, 6 and 12 weeks. MAIN OUTCOME FOR MEASURES: Weight, Barthel index of daily activities, several plasma values (albumin, C-reactive protein (CRP), homocysteine, thiamine, thiamine diphosphate (TDF), vitamin B6, vitamin B12, folic acid, vitamin D), bowel function. RESULTS: The supplement was well accepted. Thirty-five patients completed the intervention period (16 control group; 19 supplement group). Baseline daily nutrient intake was low. A statistically significant improvement was observed for body weight (difference between groups 2.2 kg, P=0.03), and homocysteine, vitamin B1, TDF, vitamin B6, vitamin B12, folate and vitamin D in the supplement group compared to the placebo group. No significant difference was observed in the Barthel index (mean difference -0.3+/-1.1 for both groups). No difference in occurrence of diarrhoea was observed. CONCLUSIONS: The study shows that nutritional supplementation is well accepted and can improve the nutritional status of psycho-geriatric nursing home patients. SPONSORSHIP: Numico Research BV.     

Prevalence of low serum folate and vitamin B12 in an older Australian population

OBJECTIVE: To examine the prevalence of low serum folate and vitamin B12, in association with elevated serum homocysteine, in a representative sample of older Australians. METHODS: During 1997-2000, 3,508 persons aged 50+ years were examined in a population-based cohort study conducted in two postcodes, west of Sydney, Australia. Of these, 2,901 participants (82.7%) provided fasting blood for estimates of serum folate, vitamin B12 and total homocysteine. RESULTS: Low serum B12 (< 185 pmol/L) was found in 22.9% of participants and low serum folate (< 6.8 nmol/L) in 2.3% of participants. Among those people with very low serum vitamin B12 (< 125 pmol/L) and low serum folate, 51% had elevated homocysteine. CONCLUSIONS: Low serum levels of vitamin B12 and elevated serum homocysteine are relatively frequent in older Australians. IMPLICATIONS: Appropriate public health action should be considered to reduce the prevalence of low serum vitamin B12 and elevated homocysteine in older Australians.     

Vitamin B12 (cobalamin)-deficiency in the elderly

In order to determine the relevance of low vitamin B12 concentration in elderly persons (greater than 65 years), serum vitamin B12 levels were measured in 292 consecutive patients upon their admission to a geriatric ward. Eighty (27%) of them were anaemic (haemoglobin less than or equal to 7.14 mmol/l). The vitamin B12 concentration was not statistically different between males and females, nor between the anaemic and non-anaemic groups. Twenty-two patients (7.5%) had a low vitamin B12 level; of these, 10 had a haemoglobin concentration higher than 7.14 mmol/l and a mean corpuscular volume lower than 98 fl. In addition, serum vitamin B12 levels were also measured in 178 consecutive anaemic patients hospitalized in the same ward. Seventeen (9.5%) of them had a vitamin B12 deficiency although in 11 the MCV was lower than 98 fl. Hypersegmented polymorphonuclear leukocytes were rarely observed in the peripheral blood smear. Pernicious anaemia could only be diagnosed in 1 patient. Serum vitamin B12 estimation may be necessary to detect vitamin B12 deficiency but a low level requires additional diagnostic investigation.     

The role of albumin in human physiology and pathophysiology, Part III: Albumin and disease states

The serum albumin level is one of several clinical parameters of the status of general health. There is a marked correlation between low albumin levels and the incidence of morbidity and mortality in hospitalized patients. Therefore, it is not surprising to find that hypoalbuminemia is a common finding among hospitalized patients. This results from alterations in the catabolic or anabolic rates, losses of albumin, or redistribution between the various fluid compartments of the body. Somewhat less well defined than the role of albumin as a prognostic indicator is its role in compounding pathophysiology. Hypoalbuminemia is known to be associated with delayed wound healing. The hypoalbuminemic state interferes with the normal functioning of the gastrointestinal tract. Qualitative changes in the albumin molecule which occur in renal disease may damage the nephron. Low serum albumin levels may adversely affect the coagulation system. Further investigation into the role of albumin in pathophysiology is warranted.     

Hospital malnutrition. A prospective evaluation of general medical patients during the course of hospitalization.

Nutrition status was evaluated in 134 consecutive admissions to a general medical service and throughout hospitalization among patients hospitalized 2 weeks or longer. Likelihood of malnutrition was determined using eight nutrition-related parameters: serum folate and vitamin C, triceps skinfold, weight/height, arm muscle circumference, lymphocyte count, serum albumin, and hematocrit. On admission 48% of patients had a high likelihood of malnutrition, which correlated with a longer hospital stay (20 versus 12 days for patients with a low likelihood of malnutrition) and an increased mortality rate (13 versus 4%). Likelihood of malnutrition increased with hospitalization in 69% of patients with paired determinations. Compared to admission, at final follow-up a greater proportion of patients fell into the depleted range of values for folate, triceps skinfold, weight/height, arm muscle circumference, lymphocyte count, and hematocrit. These parameters worsened in over 75% of patients admitted with normal values. Hematocrit fell in all patients with normal admission levels. These findings demonstrate and association between nutrition status and hospital course and a worsening trend during hospitalization.     

Nutritional status of patients hospitalised in Poland

AIM: Screening and extended assessment of the nutritional status of patients on admission and on discharge from hospital were carried out. DESCRIPTION: The studies were carried out in four teaching hospitals, four provincial hospitals and four county hospitals in Poland. SUBJECTS: Screening examinations were carried out for 3310 randomly selected patients (every 10th patient admitted to hospital, including 1916 female cases aged from 16 to 92 y and 1394 male patients aged from 16 to 100 y). Extended examinations were carried out on 210 patients aged from 16 to 87 y (including 122 female and 88 male). MAIN ASSESSMENT PARAMETERS: Anthropometric (height, weight, body mass index (BMI), waist-to-hip ratio (WHR), arm circumference) and biochemical indices (erythrocyte count, haemoglobin concentration, white blood cell count, blood lymphocyte count and serum albumin serum concentration). The extended examinations included determination of antioxidant vitamins (A, C, E), vitamin B(12) and folic acid. RESULTS: On admission to hospital, 10.43% of the patients surveyed had a BMI below 20 kg/m(2), in 20.74% of patients serum albumin concentration was below 3.5 g/dl, indicating possible protein energy malnutrition. In addition, 21.02% had lymphocyte count below 1.5 x 10(3)/mm(3). During hospitalisation, deterioration in the nutritional status of the patient population occurred. On discharge from hospital, the percentage of patients with BMI < 20 kg/m(2) increased to 11.21% and the percentage with low blood albumin (<3.5 g/dl) increased to 28.57%. On admission, vitamin C deficiency was present in 51.8% of patients, folic acid deficiency in 32%, vitamin E deficiency in 10%, vitamin B(12) deficiency in 6.8% and vitamin A deficiency in 1.4%. Vitamin deficiencies were present equally in malnourished, overweight and obese patients. CONCLUSIONS: In patients admitted to hospitals in Poland, malnutrition risk demonstrated by BMI was observed in 10.43% of patients. On the basis of biochemical indices, increased nutritional risk was demonstrated in 21% of patients. Vitamin malnutrition was seen in the majority of patients. A significant correlation between weight, BMI, arm circumference, blood lymphocyte count and the number of days spent in hospital was observed. SPONSORSHIP: The Committee of Scientific Research and the Ministry of Health-PBZ 012-14.     

Association of Vitamin B Status with Risk of Dementia in Cohort Studies: A Systematic Review and Meta-Analysis

ObjectiveTo examine the association between B vitamins status and the risk of dementia in older adults through a systematic review and meta-analysis of cohort studies.DesignSystematic review and meta-analysis.Setting and participantsOlder adults aged ≥60 years from community, nursing home, institution, or hospital.MethodsPubMed, Cochrane Library, EMBASE, Web of Science, CINAHL, ClinicalTrials, WHO-ICTRP, NHS Trusts, and ACTR were searched from the date of their inception up to November 28, 2021. We included cohort studies that assessed the association between serum B vitamins or B vitamins intake and the risk of dementia among older adults aged ≥60 years. The quality of all studies was assessed by the modified Newcastle-Ottawa Scale (NOS). The hazard ratios (HRs) and 95% CIs were calculated by the random effects model. The Grading of Recommendations, Assessment, Development, and Evaluation (GRADE) approach was used to rate the certainty of evidence.ResultsEleven cohort studies with sample sizes ranging from 233 to 3634 were included in the meta-analysis. Levels of serum folate showed statistically significant association with the risk of dementia (≥10 nmol/L: HR 1.57, 95% CI 1.01-2.46, low certainty; <10 nmol/L: HR 0.93, 95% CI 0.88-0.99, very low certainty). However, levels of vitamin B₆ intake showed no statistically significant effects on risk of dementia; levels of serum vitamin B₁₂ and vitamin B₁₂ intake also showed no statistically significant effects on risk of dementia in older adults.Conclusions and ImplicationsThe results from our meta-analysis suggest that vitamin B₆, B₁₂, and folate may not be modifiable risk factors for dementia among older adults. Current evidence on the relationship between vitamin B status and dementia is not sufficient for development of vitamin B recommendations. More high-quality cohort studies are needed to confirm the relationship between the two in the future.     

Homocysteine blood level in long-term care residents with oropharyngeal dysphagia: comparison of hand-oral and tube-enteral-fed patients

BACKGROUND: Levels of homocysteine, methylmalonic acid, and relevant vitamins were measured and evaluated in patients with oral dysphagia (OD) receiving long-term care (LTC). METHODS: Group A was composed of 26 orally fed patients, and group B was composed of 25 patients who were fed by nasogastric tube. All patients were hospitalized in the LTC departments of the Geriatric Medical Center, Shmuel Harofe. General and nutritional status were assessed, and levels of vitamins including B12, folate, and B6 were measured along with serum homocysteine and urine methylmalonic acid levels. RESULTS: Homocysteine levels were significantly higher in the orally fed patients (p < .001); 92% had higher-than-normal homocysteine levels. The levels of vitamins B12, folate, and B6 were significantly lower in the orally fed patients (p < .001), although in most patients levels were in the normal range. Notably, the levels of homocysteine were significantly correlated with the levels of all vitamins but not with the albumin or hemoglobin values. Levels of methylmalonic acid were also higher in the orally fed patients, but the difference was not statistically significant, and there was no correlation between vitamin level and methylmalonic acid level. CONCLUSIONS: Orally fed patients with OD have substantially higher homocysteine levels and appreciably lower levels of the relevant vitamins than patients with OD who receive tube feeding. Therefore, homocysteine measurement may be the preferred indicator of vitamin intake in orally fed patients with OD.     

Nutritional status of an institutionalized aged population

The nutritional status of 146 elderly residents in a long-term care facility was evaluated using biochemical and anthropometric measures. The level of nursing care required and meal locale had no significant effect on the overall nutritional status of the residents. The biochemical data indicated three nutritional problems requiring treatment and follow-up: anemia, low vitamin B6 status, and reduced albumin levels. The incidence of these problems in other groups of elderly deserves further study. Six percent of the study population were anemic, with 13% having low serum folate, 6% with low transferrin saturation, and 31% with low TIBC values suggesting more than one factor involved in the anemia. Low vitamin B6 status was observed in 28% of the population. Whether this is due to poor intake, poor absorption, or both is not known. The percentage of residents with decreased albumin levels was slightly higher than that observed in other studies of the elderly, and may be related to the more advanced age of this population.     

Nutritional status of an institutionalized aged population.

The nutritional status of 146 elderly residents in a long-term care facility was evaluated using biochemical and anthropometric measures. The level of nursing care required and meal locale had no significant effect on the overall nutritional status of the residents. The biochemical data indicated three nutritional problems requiring treatment and follow-up: anemia, low vitamin B6 status, and reduced albumin levels. The incidence of these problems in other groups of elderly deserves further study. Six percent of the study population were anemic, with 13% having low serum folate, 6% with low transferrin saturation, and 31% with low TIBC values suggesting more than one factor involved in the anemia. Low vitamin B6 status was observed in 28% of the population. Whether this is due to poor intake, poor absorption, or both is not known. The percentage of residents with decreased albumin levels was slightly higher than that observed in other studies of the elderly, and may be related to the more advanced age of this population.     

Preoperative albumin and surgical site identify surgical risk for major postoperative complications

BACKGROUND: Although malnutrition contributes to morbidity, studies of pre- and postoperative nutrition often include well-nourished patients unlikely to benefit from therapy and usually do not stratify by the site of surgical pathology. This study evaluates whether perceived preoperative markers of nutritional status recorded in charts correlates with postoperative complications and resource use in patients who receive no preoperative nutrition support and reinterprets the results of several conflicting randomized, prospective studies in this context. METHODS: This is a retrospective cohort study of 526 surgical patients who had preoperative serum albumin levels measured and were undergoing elective esophageal, gastric, pancreaticoduodenal, or colon surgery between 1992 and 1996 who could have received preoperative nutrition but did not. RESULTS: Most medical records contained inadequate analysis of preoperative nutritional status, but preoperative albumin correlated inversely with complications, length of stay, postoperative stay, intensive care unit (ICU) stay, mortality, and resumption of oral intake. Patients undergoing esophageal or pancreatic procedures sustained a significantly higher complication rate at most albumin levels, whereas colonic surgery resulted in lower complication rates at the same albumin levels. Resource use (eg, length of stay and ICU stay) related to these complication rates; esophageal and pancreatic procedures used the most resources and colon procedures used the fewest at most albumin levels. This lack of appreciation for nutritional risk and operative site can explain discrepancies in outcome noted in several randomized, prospective nutritional studies and must be applied to the design and implementation of new studies. CONCLUSIONS: Elective, non-emergent esophageal and pancreatic procedures performed in patients who could have had surgery delayed for preoperative nutrition, but did not, result in higher risk than colon surgery at any given level of serum albumin below 3.25 g/dL. Patient populations in trials should be stratified by operative site and by markers of nutritional status. Degree of hypoalbuminemia and other potential markers of nutritional status may explain many of the discrepancies between trials of nutrition support. Preexisting hypoalbuminemia in patients undergoing elective surgery remains underappreciated, unrecognized, and untreated in many hospitalized patients.     

Iron, zinc, folate and vitamin B12 nutritional status and milk composition of low-income Brazilian mothers

The purpose of this study was to assess the nutritional status of low-income Brazilian mothers, who were supplemented with iron and vitamin B12 during pregnancy, in terms of iron, zinc, folate and vitamin B12, in different stages of lactation and to determine the influence of the maternal nutritional status on milk composition. The effect of folate supplementation during pregnancy on folate status of the nursing mothers and milk composition was investigated. The effect of partial weaning on maternal status and milk composition was also studied. In general, the nutritional status of iron, zinc, folate and vitamin B12 of the mothers appears adequate. However, some of the mothers had indices of status lower than normal limits for non-pregnant women. These values, particularly after 30 d post-partum, indicate that these mothers might be at nutritional risk and that the nutrient supplementation received during pregnancy was insufficient to meet demands. There was an increase with the stage of lactation for haematocrit, serum vitamin B12, serum zinc, serum albumin, milk folate and saturation of its binding protein, but there was a decrease for milk protein, total and whey-bound iron and zinc, and lactoferrin. Mothers who took folate supplements during pregnancy had higher serum folate levels immediately after birth than those not taking the supplements but no differences were found at later stages of lactation. Milk composition was not affected. Partial weaning did not affect the maternal nutritional status or the milk composition except for iron which was higher in milk from mothers who were partially breastfeeding.(ABSTRACT TRUNCATED AT 250 WORDS)     

2013年中国2岁以下儿童母亲维生素B12营养状况及其影响因素

目的 了解中国2岁以下儿童母亲维生素Bl2营养状况的现状,并分析其影响因素.方法 利用2013年中国居民营养与健康状况监测中2岁以下儿童母亲的调查数据,采用多阶段分层抽样方法抽取中国30个省(自治区、直辖市)的55个县(市/区)2岁以下儿童母亲.最终采集2岁以下儿童母亲血液样本10331份,问卷调查收集其基本情况,通过...     

Determination of serum albumin in older adults. A need for specification of the assay method

OBJECTIVES: To assess the difference between two colorimetric methods for serum albumin determination, bromocresol purple (BCP) and bromcresol green (BCG), in patients hospitalized in a geriatric hospital. DESIGN: Prospective study of consecutive blood samples. SETTING: A 200-bed Geriatric Division of a university-affiliated geriatric-psychiatric hospital. PARTICIPANTS AND MEASUREMENTS: All serum albumin determinations were obtained from patients hospitalized in the geriatric division during a 3-month period, November 1999 through January 2000. All albumin determinations were performed by two methods: BCP and BCG. RESULTS: A total of 326 serum albumin determinations were performed during the study period. The average serum albumin levels observed were 28.2+/-7.5 g/L and 37.6+/-7.2 g/L for the BCP and BCG methods, respectively. Using the BCP method, 80.1% of serum albumin levels were below 35.0 g/L (cutoff point for hypoalbuminemia) versus 41.1% using the BCG method. CONCLUSIONS: The widespread use of both BCG and BCP and the marked clinical implications of their alternative use underscores the importance of specifying the method employed in determination of serum albumin in routine laboratory analyses. Moreover, physicians need to be aware of which procedure is being used in their hospital.