As to more specific lifestyle factors related to diet, the potential adverse skeletal Blebbistatin order effects of low calcium intake, high sodium intake and excessive caffeine consumption have been addressed in the section on nutrition. The use of carbonated soda drinks and more in particular of colas has been associated

with lower bone mass. Besides displacement of more nutrient- and calcium-rich beverages, caffeine, and phosphoric acid content in colas have also been implicated as contributing to the adverse skeletal effects [13, 91]. Excessive alcohol consumption is generally recognized as a secondary cause of osteoporosis and as a risk factor for fracture [79]. Alcohol may interfere with bone metabolism through direct toxic effects on osteoblasts and indirectly www.selleckchem.com/products/ABT-888.html through adverse skeletal effects of nutritional deficiencies in calcium, vitamin D, and proteins that are prevalent in heavy drinkers. However, increased fracture risk is explained only for a minor part by

increased bone fragility and other factors, perhaps resulting in an increased risk for falls, are involved. In a meta-analysis of three prospective studies in a total of 5,939 men and 11,032 women, followed for 75,433 person-years [92], alcohol consumption was non-linearly associated with an increased fracture risk. Consumption of 2 units or less (1 unit = 10 g ethanol) per day was not associated with an increased fracture rate, whereas higher SDHB alcohol

intake was associated both in men and women with an increased risk of any fracture (risk ratio (RR) = 1.23; 95% CI, 1.06–1.43), any osteoporotic fracture (RR = 1.38; 95% CI, 1.16–1.65), or hip fracture (RR = 1.68; 95% CI, 1.19–2.36). A similar threshold of around 2 units per day for the association of alcohol intake and fracture risk was reported in earlier studies [93, 94]. At variance with the findings in some other studies, there were no significant difference between gender for either the risk ratios or threshold; above the threshold, there was a dose–effect. Also at variance with some other studies reporting a J-shaped association between alcohol consumption and fracture risk, fracture risk was not higher in subjects abstaining from alcohol use as compared with those consuming 1or 2 units per day [79, 92]. However, it should be noted that a number of both cross-sectional and prospective studies failed to detect an increased fracture risk associated with alcohol intake (see reference [1] for review). Smoking has adverse skeletal effects and current smoking is associated with an increased fracture risk [79]. Albeit it has been reported that the adverse effects on BMD are apparent after the age of 50 and increase with age [95], smoking has been shown to also adversely affect bone health in young individuals during bone maturation [96].