vitamin b complex

In a normal, healthy individual eating a diet rich in vitamin C, we might expect adequate levels of vitamin C for normal cell functions. Any condition that would decrease these levels, such as smoking or chronic diseases, would therefore result in a decline in cell function. Of particular interest to our laboratory is the observation that vitamin C levels appear to decline in the elderly. This has been observed not only in human plasma, but also in plasma and tissues in rats, our model system. Why do vitamin C levels decline with age? The most straightforward answer is that vitamin C uptake declines with age. In other words, our bodies don't have the same capacity to absorb vitamin C, so vitamin C levels in the plasma and tissues become lower. This has been supported by a recent meta-analysis, which showed that the elderly had much lower plasma vitamin C levels than younger adults following a given dose of vitamin C. This suggests that vitamin C absorption in the gut declines with age. Vitamin C absorption is

Eat a healthy diet. Start with a diet built around fruits and vegetables (eight to ten servings a day); whole-grain breads and cereals; beans; low-fat poultry and meat; non-fried fish; and low-fat milk, cheese, and yogurt.

Recent research indicates that DHA plays an important role in the regeneration of the visual pigment rhodopsin, which plays a critical role in the visual transduction system that converts light to vision.

Historically, vitamin K deficiency has been defined as a disruption of blood clotting due to diminished Gla content of the vitamin K-dependent coagulation factors. Infants are at risk for severe cerebral hemorrhage during the first three to four months after birth, if they do not get enough vitamin K. The reason for vitamin K deficiency in these children is usually impaired fat absorption in conjunction with a low vitamin intake from breastfeeding. (Human milk contains much less vitamin K than infant formulas). In the US and many other countries newborn infants routinely receive vitamin K. Bleeding due to the lack of vitamin K is very rare in older children and adults, presumably, because vitamin K is produced by intestinal bacteria and a small fraction is absorbed from ileum and colon. Oral antibiotic treatment, in conjunction with low vitamin K intake, can induce bleeding. Less than a few days' intake of vitamin K is stored, most of it in liver and bone; in the absence of dietary or intestinal vitamin K sou

Today we recognize approximately 13 vitamins or vitamin groups, as well as 7 major minerals and 10 trace elements, and our understanding of these compounds continues to evolve as we become increasingly aware of their complex nature.