190,000 surgeries; 3,200 died within 30 days
Chance of dying – which ranged from 14% to 0.1% depending on surgery type
2.8 % for BMI < 23
<1 % for BMI > 35

Fact: Surgery reduces vitamin D levels
Fact: Higher level of Vitamin D after surgery reduces chance of death
Suspect: Vitamin D stored in the fat becomes available to post-surgery
Recommend: Take lots of vitamin D before and after surgery

Summary: Surgery reduces vitamin D needed to survive. Vitamin D may become available after surgery from fat-stores of overweight patients.

References at Vitamin D Life

• Vitamin D deficiency was the best predictor of older patient death in hospital – May 2010
• Hospital stay 6 days longer for nursing home residents with low vitamin D – Oct 2011
• Critical Care patients with low vitamin D were 85 percent more likely to die – Sept 2011
• All items in category After Surgery or Trauma
• Rehab patients vitamin D deficient - with chart Nov 2010.pdf file
• Adding Vitamin decreased kidney deaths by 4x – Dec 2010
• Gut surgery appears to benefit from vitamin D
• Fat soluble vitamins decrease quickly after trauma
• Knee surgery reduced vitamin D by 40 percent in 2 days – May 2011
• Inflammation or surgery or heart attack decreases measured vitamin D levels – Mar 2011
• All items in category Obesity and vitamin D 102 items Nov 2011
• BMI was excellent predictor of vitamin D levels – Feb 2010

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Study was reported on by many web sites – such as

USA Today   LA Times   MedicalExpress   MedPageToday which had more details
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The Relationship Between Body Mass Index and 30-Day Mortality Risk, by Principal Surgical Procedure

Florence E. Turrentine, PhD, RN; John B. Hanks, MD; Bruce D. Schirmer, MD; George J. Stukenborg, PhD, MA
Arch Surg. Published online November 21, 2011. doi:10.1001/archsurg.2011.310

Objective To examine the relationship between body mass index (BMI; calculated as weight in kilograms divided by height in meters squared) and 30-day mortality risk among patients in the participant use data file database of the American College of Surgeons National Surgical Quality Improvement Program. Obesity is a prevalent chronic disease in the United States, and general and vascular surgeons are caring for an increasing population of obese patients.

Design Multivariable logistic regression analysis was used to assess the statistical significance of the relationship between BMI and mortality, with adjustments for patient-level differences in overall mortality risk and principal operating procedures. Odds ratios with 95% CIs were calculated to measure the relative difference in mortality by BMI quintile, with reference to the middle quintile of the BMI. The overall significance of the BMI and of the other covariates was measured using the Wald {chi}2 test statistic. A separate multivariable logistic regression model was developed to assess the significance of the interaction between BMI and primary procedure.

Setting A total of 183 sites.

Patients Patients with major surgical procedures reported in the participant use data file database of the American College of Surgeons National Surgical Quality Improvement Program.

Results The data included 189 533 cases of general and vascular surgical procedures reported in 2005 and 2006 for patients with known overall probabilities of death. Among these, 3245 patients died within 30 days of their surgery (1.7%). Patients with a BMI of less than 23.1 demonstrated a significant increased risk of death, with 40% higher odds compared with patients in the middle range for BMI (26.3 to <29.7). Important differences in the association between BMI and mortality risk occur by type of primary procedure.

Conclusions Body mass index is a significant predictor of mortality within 30 days of surgery, even after adjusting for the contribution to mortality risk made by type of surgery and for a specific patient's overall expected risk of death.