贵阳城区成人维生素D营养状况调查

目的 调查贵阳城区成人维生素D营养状况.方法 用整群抽样的方法抽取贵阳市云岩区 宅吉社区中20～79岁(年龄中位数为45.2岁)健康成人1 500名,于2009年11月至2010年2月进行问卷调查,并采集清晨空腹静脉血分离血清,用美国DiaSorin公司的放射免疫试剂盒测定血清25-羟维生素D[25(OH)D]水平.结果 贵阳城区成人血清25(OH)D平均水平为(20.4±9.0)ng/ml;成人25(OH)D缺乏[25(OH)D＜20ng/ml]、不足[20ng/ml≤25(OH)D＜30 ng/ml]、正常[25(OH)D≥30 ng/m1]分别为52.3%、32.3%及15.4%.贵阳城区青年、中年、老年人群血清25(OH)D平均水平依次为(18.2±9.2)、(22.8±8.7)及(19.9±7.8)ng/ml.青年、中年与老年人群维生素D缺乏依次为62.8%、40.2%与55.4%.高学历人群(≥13年)维生素D缺乏为61.6%,低体重人群(体重指数＜18.5 kg/m2)维生素D缺乏为64.4%.结论 贵阳城区成人维生素D缺乏普遍,尤其见于老年人及青年人群,并受文化程度、年龄、吸烟等因素影响.

Abstract：

Objective To evaluate vitamin D status in healthy adults living in Guiyang. Method 1 500 healthy volunteers aged 20-79 years ( mean 45.2 years ) were recruited from a community in Guiyang by cluster sampling method. Questionnaires for living habits and fasting blood samples were collected from November, 2009 to February, 2010. Serum 25 ( OH ) D concentrations were measured by radioimmunoassay, using the DiaSorin kit,USA. Results The average serum 25 ( OH ) D level was ( 20. 4±9.0 ) ng/ml. The percentages of vitamin D deficiency [25 ( OH ) D ＜ 20 ng/ml], insufficiency [20 ng/ml ≤ 25 ( OH ) D ＜ 30 ng/ml], and sufficiency [25 ( OH ) D ≥ 30ng/ml] were 52. 3% , 32. 3% , and 15.4% , respectively. The 25 (OH) D concentrations in the young, middle-aged,and elderly were ( 18. 2±9. 2), (22. 8±8. 7), and ( 19. 9±7.8) ng/ml, respectively. The percentages of vitamin D deficiency in these groups were 62. 8%, 40. 2%, and 55.4%, being 61.6% in higher educational group ( ≥ 13 years) and 64. 4% in the group with lower body mass index ( ＜ 18.5 kg/m2 ). Conclusion Vitamin D deficiency is common in Guiyang including all age groups, especially among the youth and the elderly. Serum 25-hydroxyvitamin D level is also influenced by education, age, smoking, and other factors.     

中国北方健康人群血清25羟维生素D_3和25羟维生素D_2水平

目的分析中国北方人群血清25羟维生素D3(25OHD3)和25羟维生素D2(25OHD2)水平。方法采用同位素稀释超高压液相色谱-串联质谱法(ID-UPLC/MS/MS)对2013年在北京、大连、乌鲁木齐3个城市征集的1 540名表观健康志愿者[男性744人,女性796人,平均年龄(42.0±14.0岁)]进行血清25OHD3和25OHD2测定。同时分别应用偶氮Ⅲ砷法、磷钼酸紫外比色法、酶化学发光法检测志愿者血清钙(Ca)、磷(P)及全段甲状旁腺素(iPTH)水平。使用SPSS17.0进行统计学分析,P0.05表示差异有统计学意义。结果受试人群血清总25OHD平均值为(18.80±6.65)ng/mL。3个城市受试人群血清总25OHD含量差异有统计学意义(F=97.57,P0.01),大连市受试者血清总25OHD水平[(21.72±6.47)ng/mL]显著高于乌鲁木齐市和北京市受试者[(18.44±6.64)ng/mL、(16.34±6.12)ng/mL](均P0.01);男性血清25OHD水平[(20.57±6.63)ng/mL]显著高于女性[(17.14±6.24)ng/mL],(P0.01);30~39岁年龄组25OHD含量显著低于其他年龄组(均P0.05)。3省受试人群血清总25OHD缺乏率为60.06%,大连市受试者血清总25OHD缺乏率(41.51%)显著低于乌鲁木齐市(64.87%)和北京市(73.76%),(均P0.01)。3个城市57例受试者(3.70%)血清25OHD2检测均值为(6.25±3.76)ng/mL。在57例检测25OHD2受试者中,25OHD2显著提高了血清总25OHD水平,使该人群血清25OHD缺乏率降低43.85%。血清25OHD水平与iPTH相关系数为-0.283(P0.01)。结论 3个城市受试人群血清25OHD含量存在明显的地域、性别和年龄差异。健康人群中血清25OHD主要为25OHD3。北方地区人群血清25OHD水平普遍较低。     

新疆克拉玛依居民维生素D水平现状调查

目的了解克拉玛依居民维生素D水平现状,为该地区居民防治维生素D缺乏提供依据。方法使用电化学发光法检测25-羟维生素D (25-hydroxy vitamin D,25-OHD),收集2017年克拉玛依市人民医院全部健康检查人群25-OHD数据,比较不同年龄、性别、季节人群25-OHD水平的差异。结果共纳入4 601例研究对象,年龄0. 5～93岁,男女比例1∶2. 38。血清25-OHD的平均水平为(37. 32±21. 78) nmol/L,其中维生素D缺乏、不足、充足人数分别占受检总人数的81. 22%、14. 10%、4. 67%。小于12岁儿童维生素D几乎不缺乏,男女间25-OHD水平比较差异无统计学意义(P>0. 05); 12～19岁青少年25-OHD水平男性高于女性,分别为(41. 65±20. 48)和(28. 02±18. 40) nmol/L,P<0. 05;生育年龄段女性均高于男性,20～34岁组男性和女性25-OHD水平分别为(31. 95±18. 68)和(37. 30±19. 02) nmol/L,35～44岁男性和女性25-OHD水平分别为(30. 20±14. 62)和(36. 75±19. 50) nmol/L,均P <0. 05;更年期及老年组男性25-OHD水平男性均高于女性,但差异无统计学意义(均P>0. 05)。夏、秋、冬三季25-OHD水平男性明显高于女性,P<0. 05;春季比秋季维生素D缺乏明显。结论克拉玛依居民维生素D水平普遍较低,且维生素D水平与年龄、季节及性别都有相关性。     

肥胖与血清维生素D水平的关系研究

测定不同肥胖类型者血清25-羟维生素D3[25-(OH)D3]水平.发现超重或肥胖者及腹型肥胖者血清25-(OH)D3水平降低(P＜0.01);血清25-(OH)D3与体重指数及腰围呈独立负相关.提示肥胖与维生素D水平下降密切相关.

Abstract：

Serum 25-(OH)D3concentration was determined in subjects with different types of obesity. The serum 25-(OH)D3levels in overweight or obese and central obese subjects were lower than that in non-obese subjects.(P＜0.01). In a multiple linear regression analysis serum 25-(OH)D3was independently and negatively correlated with body mass index and waist circumference.     

贵阳市社区中老年人血压和血清25-羟维生素D水平的相关性研究

目的探讨贵阳市社区中老年人血清25-羟维生素D水平对血压的影响。方法采用整群抽样方法调查贵阳市社区年龄≥46岁的常住居民706人。根据年龄分为:中年组499例(46～64岁),老年组207例(年龄≥65岁),进行问卷调查及体格检查,并采集清晨空腹静脉血分离血清,美国DiaSorin公司的放射免疫试剂盒测定25-羟维生素D浓度。结果老年组收缩压水平明显高于中年组,老年组女性25-羟维生素D水平明显低于男性及中年组,差异有统计学意义(P<0.05)。logistic回归分析,年龄、体重指数与收缩压呈正相关(OR=1.072,95%CI:1.048～1.096;OR=1.147,95%CI:1.084～1.213,P<0.01),体重指数与舒张压呈正相关(OR=1.172,95%CI:1.108～1.240,P<0.01),25-羟维生素D水平与舒张压及收缩压不相关。结论贵阳市中老年人血压与25-羟维生素D水平无显著关联。     

中国北方健康人群血清25羟维生素D_3和25羟维生素D_2水平

目的分析中国北方人群血清25羟维生素D3(25OHD3)和25羟维生素D2(25OHD2)水平。方法采用同位素稀释超高压液相色谱-串联质谱法(ID-UPLC/MS/MS)对2013年在北京、大连、乌鲁木齐3个城市征集的1 540名表观健康志愿者[男性744人,女性796人,平均年龄(42.0±14.0岁)]进行血清25OHD3和25OHD2测定。同时分别应用偶氮Ⅲ砷法、磷钼酸紫外比色法、酶化学发光法检测志愿者血清钙(Ca)、磷(P)及全段甲状旁腺素(iPTH)水平。使用SPSS17.0进行统计学分析,P<0.05表示差异有统计学意义。结果受试人群血清总25OHD平均值为(18.80±6.65)ng/mL。3个城市受试人群血清总25OHD含量差异有统计学意义(F=97.57,P<0.01),大连市受试者血清总25OHD水平[(21.72±6.47)ng/mL]显著高于乌鲁木齐市和北京市受试者[(18.44±6.64)ng/mL、(16.34±6.12)ng/mL](均P<0.01);男性血清25OHD水平[(20.57±6.63)ng/mL]显著高于女性[(17.14±6.24)ng/mL],(P<0.01);30~39岁年龄组25OHD含量显著低于其他年龄组(均P<0.05)。3省受试人群血清总25OHD缺乏率为60.06%,大连市受试者血清总25OHD缺乏率(41.51%)显著低于乌鲁木齐市(64.87%)和北京市(73.76%),(均P<0.01)。3个城市57例受试者(3.70%)血清25OHD2检测均值为(6.25±3.76)ng/mL。在57例检测25OHD2受试者中,25OHD2显著提高了血清总25OHD水平,使该人群血清25OHD缺乏率降低43.85%。血清25OHD水平与iPTH相关系数为-0.283(P<0.01)。结论 3个城市受试人群血清25OHD含量存在明显的地域、性别和年龄差异。健康人群中血清25OHD主要为25OHD3。北方地区人群血清25OHD水平普遍较低。     

成都地区291名绝经后女性骨密度与维生素D水平

目的了解成都地区部分绝经后妇女维生素D水平,观察血清25(OH)D3与骨密度、年龄、绝经年龄、体重指数的关系。方法用整群随机抽样方法抽取成都地区291名绝经后女性,平均年龄(63.9±9.7)岁,按每10岁为1个年龄组分组。记录身高、体重、绝经年龄等基本信息,使用双能X线吸收骨密度仪(DXA)测量腰椎2-4椎体(L2-4)、左髋关节股骨颈和全髋骨密度(BMD),用酶联免疫法测定血清25(OH)D3水平。分析绝经后女性骨量及血清25(OH)D3分布情况。结果超过半数的受试者(52.2%)患骨质疏松症,发病率随年龄增加而增高,80岁老年女性发病率达76.47%。血清25(OH)D3水平平均为18.37 ng/mL,维生素D缺乏发生率为68.38%。血清25(OH)D3水平与骨密度、年龄、绝经年龄无关,与BMI呈负相关(P=0.000)。结论成都地区部分绝经后妇女普遍存在维生素D缺乏,绝经后妇女应及时补充维生素D。     

中老年人维生素D的营养状况

目的分析中老年体检者血清25-羟维生素D[25(OH)D]水平,了解维生素D营养状况。方法宁夏银川地区的中老年体检者931例采用电化学发光法测定血清25(OH)D水平,统计分析各年龄组和1年的25(OH)D分布状况。结果 25(OH)D平均水平为(14.57±8.20)ng/ml,维生素D缺乏和不足者占81.03%,其中男性占78.42%,女性占82.95%,性别差异无统计学意义(t=0.71,P>0.05)。根据血清25(OH)D的水平分为营养缺乏症,不足组,正常组和良好组,各组所占比例分别为42.32%,38.67%,14.50%和4.51%。各年龄段维生素D营养状况分布不同,进一步直线相关分析提示25(OH)D水平与年龄呈负相关(r=-0.15,P<0.01)。25(OH)D水平呈现季节性变化(F=7.21,P<0.01),夏秋季25(OH)D水平较高,而冬春季相对较低。结论宁夏银川地区中老年人群普遍缺乏血清维生素D,冬节较为严重,且随着年龄的增大有下降的趋势。提示应关注中老年人维生素D营养状况,及时补充维生素D。     

男性维生素D水平与血浆致动脉硬化指数关系的研究

目的探讨男性维生素D水平与血浆致动脉硬化指数之间的关系。方法选取2013年1月至2013年12月期间在解放军第306医院体检中心体检的男性934例,留取空腹静脉血,测定血清25-羟维生素D的水平;检测血清甘油三酯及高密度脂蛋白胆固醇,计算血浆致动脉硬化指数。分析25-羟维生素D水平与血浆致动脉硬化指数之间的关系。结果受试者25-羟维生素D水平为53.23±21.59 nmol/L,血浆致动脉硬化指数水平为0.10±0.30,两者呈明显的负相关(r=-0.10,P0.01)。维生素D缺乏组的血浆致动脉硬化指数明显高于维生素D正常组(0.13±0.30比0.08±0.29,P0.05)。血浆致动脉硬化指数异常组25-羟维生素D水平较血浆致动脉硬化指数正常组明显降低(51.35±21.06 nmol/L比54.66±21.90 nmol/L,P0.05)。结论男性维生素D水平与血浆致动脉硬化指数关系密切。因此,维持人体正常维生素D水平可能对预防动脉粥样硬化及相关疾病具有一定意义。     

老年男性血清25羟维生素D水平与左心室肥厚的相关性研究

目的探讨老年男性血清25羟维生素D水平对于心脏左心室肥厚(LVH)的预测意义。方法选取333例老年男性患者,根据是否合并LVH分为非LVH组208例,LVH组125例,2组行超声心动检查,采用ELISA法检测血清25羟维生素D,采用多因素多元逐步回归分析。结果与非LVH组比较,LVH组血清肌酐水平明显升高,差异有统计学意义(P<0.05);血清25羟维生素D明显降低[(35.5±14.8)nmol/L vs(30.7±10.8)nmol/L,P<0.05],左心室重量指数(LVMI)明显增高(P<0.01)。体重指数和25羟维生素D与LVMI独立相关(β=0.216,-0.155,P<0.01)。结论在老年男性患者中,较低的25羟维生素D水平可能是LVH的独立危险因素。     

山东地区中老年人群维生素D缺乏情况及其与高血压的关系

目的：观察山东地区城乡中老年人群维生素D缺乏情况,并探讨其与高血压的关系。方法共有1792例年龄40～50岁的中老年人纳入本研究。对所有受试者进行详细的体格检查和血压测定,酶联免疫法测定血清25-羟维生素D水平[25（OH）D]。应用独立样本t检验分析中老年人群25（OH）D水平的城乡差异,应用偏相关、二元Logistic回归方法分析血清25（ OH） D水平与血压的关系。结果本组中老年人血清维生素D平均水平为48．83 nmol/L,维生素D缺乏患病率为60．05％,城市中老年人血清25（OH）D水平显著低于农村（P＜0．05）。校正年龄、性别、地区及饮酒状况后,本组受检者血清25（OH）D水平与收缩压（SBP）和舒张压（DBP）无相关性（P均＞0．05）。 Logistic回归分析显示,血清25（OH）D 水平与高血压无关（OR＝-0．003,95％CI：0．991～1．004,P＝0．425）。结论中老年人群普遍存在维生素D缺乏,城市中老年人群血清25（OH）D水平明显低于农村。中老年人群血压与25（ OH） D水平间无显著相关性。     

上海地区人群维生素D状态研究

目的调查居住在上海地区人群的维生素D状态,探索和建立维生素D"正常"与"适宜"状态测定参考值,为骨质疏松症的防治提供依据。方法 2008年10月至2009年4月、2009年10月至2010年4月用自动电子发光免疫法对在上海地区居住超过5年的2607名健康成人进行血清25羟化维生素D(250HD)和甲状旁腺素(17TH)检测。选择250HD≤12、≤15、≤20和≤30 ng/mL等不同测定值计算低维生素D状态。结果 2607名受试者年龄20～102岁,平均年龄(60.4±20.9)岁,其中男性1150名(44.42%),女性1449名(55.58%),血清250HD平均值为(17.96±6.43)ng/mL,PTH为(2.14±17.10)pg/mL,呈近似正态分布。应用血清250HD4个测定值评估低维生素D状态结果显示:维生素D缺乏或不足的发生率分别为20.85%、32.45%、66.12%和97.36%,15 ng/mL测定值组有明显的增龄性低维生素D状态。2008年10月至2009年4月和2009年10月至2010年4月测定的血清250HD平均值差异有统计学意义。结论结合上海地区人群总体健康水平,维生素D"适宜"状态测定值宜采用20～30 ng/mL,低维生素D状态测定值宜采用15 ng/mL,低维生素D状态的流行率为32.45%。     

Association between vitamin D and respiratory outcomes in Canadian adolescents and adults

Background: Asthma is one of the most prevalent chronic diseases worldwide, affecting more than 200 million people. Vitamin D deficiency has been reported among individuals with asthma and might play a role in asthma exacerbations. In this cross-sectional study, we investigated the association of serum 25-hydroxy vitamin D [25(OH)D] levels and current asthma, ever asthma, and lung function. Methods: Data from 3937 subjects aged 13–69 years who participated in the Canadian Health Measures Survey – Cycle 1 were considered in this study. Serum 25(OH)D levels were categorized into ≤49?nmol/L (low), 50–74?nmol/L (moderate) and ≥75?nmol/L (high). Results: The proportion of subjects with current and ever asthma was greater in the lower 25(OH)D category than in moderate and high categories. After adjusting for potential confounders, subjects in the low 25(OH)D levels were more likely to have current asthma than those in the moderate levels (OR: 1.54, 95% CI: 1.01–2.36). Low 25(OH)D levels were also associated with ever asthma (OR: 2.12, 95% CI: 1.40–3.21) among those with a family history of asthma and this association was stronger in those with asthma onset before 20 years of age. High 25(OH)D levels were associated with lower mean value of FEV₁/FVC ratio. No significant association was observed between 25(OH)D levels and other lung function measurements. Conclusion: In this study, 25(OH)D levels below 50?nmol/L were associated with an increased risk of current and ever asthma. Further exploration of this relationship is needed to determine the optimal level of vitamin D in the management of asthma in adolescents and adults.     

Vitamin D and respiratory health in the Busselton Healthy Ageing Study

Background and objective

The relationship between vitamin D and respiratory disease was examined by cross‐sectional analysis of a large community‐based sample.

Methods

Serum 25‐hydroxyvitamin D (25OHD) and history of respiratory disease, symptoms (recorded by questionnaire) and spirometry were measured in 5011 adults aged 45–69 years. Adjustments were made for age, sex, season and smoking (Model A), plus body mass index (BMI) and physical activity level (Model B), plus history of chronic diseases (Model C).

Results

Mean (SD) age was 58 (SD 6) years with 45% males, 10% current smokers and 12% taking vitamin D supplements. The prevalence of 25OHD level <50 nmol/L was 8.0%. In all the three models, 25OHD <50 nmol/L was significantly associated with asthma (Model C: odds ratio (OR): 1.32; 95% CI: 1.00, 1.73), bronchitis (1.54; 1.17, 2.01), wheeze (1.37; 1.10, 1.71) and chest tightness (1.42; 1.10, 1.83). Participants with vitamin D level > 100 nmol/L had higher forced vital capacity (FVC) in all the three models (1.17% higher, compared with the 50–100 nmol/L group in Model C).

Conclusion

Low levels of serum 25OHD were independently associated with asthma, bronchitis, wheeze and chest tightness after three levels of adjustment for potential confounders. Higher vitamin D levels were associated with higher levels of lung function.

     

血清25-羟基维生素D3浓度水平与成人支气管哮喘及COPD的相互关系

目的通过检测支气管哮喘、COPD患者血清25（OH）D3水平,分析其与两种疾病的关系。方法随机选择哮喘患者59例、COPD患者35例,与之年龄、性别等相仿的健康对照组49例。通过电化学发光法检测25（OH）D3水平,并分析成人哮喘及COPD患者与对照组血清25（OH）D3水平的差异性。检测哮喘患者肺功能指标,分析与25（OH）D3水平相关性,以P〈0．05为有统计学意义。结果病例组血清25（OH）D3水平低于对照组,差异有统计学意义（P〈0．05）,哮喘患者血清25（OH）D,水平与FEV1、FEV1／FVC、FVC实测值之间无相关性（P〉0．05）。结论支气管哮喘及COPD患者均普遍存在维生素D缺乏现象。在成人支气管哮喘患者低的25（OH）D3水平与其肺功能之间无相关性。     

肥胖儿童血清 CT、25-OHD 水平变化及其与胰岛素抵抗的关系

目的观察不同程度、类型肥胖儿童血清卡尼汀（CT）、25-羟基维生素D（25-OHD）水平,并分析其与胰岛素抵抗的关系。方法单纯性肥胖儿童60例（观察组,其中轻度肥胖23例,中度肥胖30例,重度肥胖7例;腹型37例,周围型33例）,健康体检儿童30例（对照组）。采用高效液相色谱法测定两组血清CT水平,免疫化学发光法检测25-OHD水平,葡萄糖氧化酶法检测空腹血糖（FBG）,放射免疫分析法检测空腹胰岛素（FINS）水平,ELISA法检测瘦素（LP）、脂联素（ADPN）水平,计算体质量指数（BMI）、腰臀比（WHR）,按HOMA模型计算胰岛素抵抗指数（InRI）,并分析观察组血清CT、25-OHD与其余观察指标的相关性。结果与对照组比较,观察组CT、25-OHD、ADPN水平降低,BMI、WHR、FBG、FINS、InRI、LP水平升高（P〈0．05或0．01）;与重度比较,观察组轻度、中度肥胖患儿血清CT、25-OHD水平升高（P均〈0．05）;与周围型比较,观察组腹型肥胖患儿血清CT、25-OHD水平降低（P均〈0．05）;观察组儿童血清CT与ADPN（r：0．364,P〈0．01）、25-OHD（r=0．251,P〈0．05）呈正相关,与WHR（r=0．351,P〈0．01）、FINS（r=0．270,P〈0．05）、InRI（r=0．395,P〈0．01）、IJP（r=0．273,P〈0．01）呈负相关。血清25-OHD与ADPN呈正相关（r=0．417,P〈0．01）,与WHR（r=-0．435,P〈0．01）、InRI（r=-0．317,P〈0．01）、LP（r=-0．291,P〈0．01）呈负相关。结论不同类型及程度肥胖患儿血清CT、25-OHD水平不同,CT、25-OHD与肥胖儿童胰岛素抵抗有关。     

Vitamin D status in primary hyperparathyroidism

Background

Hypovitaminosis D worsens the manifestations of primary hyperparathyroidism (PHPT). Only a few studies have assessed the status of vitamin D in PHPT. The objective of this study was to determine the prevalence of 25(OH)D levels < 50 nmol/L in PHPT in comparison to a population without PHPT.

Methods

Subjects with PHPT were identified from the computerized database of the Clalit Health Services in Israel and were included only if they had an available serum 25(OH)D test result in 2009 and were not taking vitamin D supplements in 2008-2009 prior to the 25(OH)D test result. Subjects with renal failure were excluded (included n = 1180). All other subjects with an available 25(OH)D value in 2009 constituted the control group (n = 184,479).

Results

Subjects with PHPT and 25(OH)D < 50 nmol/L had higher levels of serum PTH, alkaline phosphatase, and calcium levels compared to those with 25(OH)D levels ≥ 50 nmol/L (P < 0.02). The mean serum 25(OH)D level was 47.7 ± 22.5 nmol/L compared to 52.1 ± 24.5 nmol/L in the control group (P < 0.001). 59.6% of subjects with PHPT had 25(OH)D levels < 50 nmol/L as compared to 49.5% in the control group (P < 0.001). Logistic regression, controlling for gender, ethnicity, age, and seasonality, showed that PHPT independently predicted 25(OH)D levels < 50 nmol/L; OR = 1.61(95% CI, 1.43-1.82).

Conclusions

Serum 25(OH)D levels < 50 nmol/L are frequent in PHPT, are more common than in controls, and are associated with more severe bone disease based on higher serum PTH and bone turnover biomarkers.     

Chemotherapy is linked to severe vitamin D deficiency in patients with colorectal cancer

Background  Preclinical and clinical evidence support an association between vitamin D deficiency and an increased risk of colorectal cancer. Normal vitamin D status has been linked to favorable health outcomes ranging from decreased risk of osteoporosis to improved cancer mortality. We performed a retrospective study to assess the impact of metastatic disease and chemotherapy treatment on vitamin D status in patients with colorectal cancer residing in Western New York. Materials and methods  Patients, 315, with colorectal cancer treated in a single institute were assayed for 25-OH vitamin D. The association of age, gender, primary disease site and stage, body mass index, and chemotherapy with vitamin D status was investigated. Results  Vitamin D deficiency was common among participants with a median 25-OH vitamin D level of 21.3 ng/ml (optimal range 32–100 ng/ml). Primary site of disease and chemotherapy status were associated with very low 25-OH vitamin D levels (≤15 ng/ml) on multivariate analysis. Patients receiving chemotherapy and patients with a rectal primary were 3.7 and 2.6-fold more likely to have severe vitamin D deficiency on multivariate analysis than nonchemotherapy patients and colon cancer primary patients, respectively. Conclusions  Chemotherapy is associated with a significant increase in the risk of severe vitamin D deficiency. Patients with colorectal cancer, especially those receiving chemotherapy, should be considered for aggressive vitamin D replacement strategies.