Vitamin B-12 deficiency is associated with an elevated HC. The prevalence of hyperhomocysteinemia in the general population is 5-10%; in people older than 65 years it may reach 30-40%. Elevated HC is a risk factor for coronary artery, cerebrovascular, and peripheral vascular diseases and venous thrombosis.hildren require 0.7 mcg/d and, in adolescence, 2 mcg/d. Because vitamin B-12 is highly conserved through the enterohepatic circulation, cobalamin deficiency from malabsorption develops after 2-5 years and deficiency from dietary inadequacy in vegetarians develops after 10-20 years.
Articles for Teachers. How long does a teacher have to go to school. By:mt. For some of the time a teacher spends in school, every one should go to school. From kindergarten to graduation from high school is 13 years. Everyone in the U.S. is expected to have that much schooling.
High School starts at grade 9, so you would be 14 or 15 years  old. High school lasts for 4 years. So usually at around 18 years  old you go to college, which is the same as â¦ a university.You can  go to college for 2, 4, 6 or 8 years.iddle school ages range from 11-14, high school ages range from 14-18 and college ages range from 18-21+. *Remember that a student can skip grades, or some schools may be different (some middle schools are just 7th and 8th grade).