The primary aim of the study is to compare the effects of the two blood glucose targets on 90 day all-cause mortality in Intensive Care patients who are predicted on admission to stay in the ICU for at least one full calendar day. The hypothesis is that there is little difference in the relative risk of death between patients assigned a glucose range of 4.5 - 6.0 mmol/L, and those assigned a glucose range of less than 10.0 mmol/L with insulin being infused if blood glucose exceeds 10.0 mmol/L, and adjusted when needed to maintain blood glucose of 8.0 - 10.0 mmol/L.