L1: folic acid

20 important questions on L1: folic acid

What is spina bifida? What are the concequences?

A sort of NTD. It is incomplete closing of the backbone and membranes around the spinal cord. Children are lifelong affected with disability and morbidity, and have a 10 times higher risk of mortality.

What is the world wide prevalence of NTD yearly?

>300 000 per year.

What is the prevalence of NTD in the US yearly?

3000 per year
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What was the first step in science in finding out that NTD had something to do with folate?

Hibbard (1964) found out that women with children with NTD had higher urinary formiminoglutamic acid than normal population. Folate is involved in breaking down this compound.

What is the advice for folic acid suplementation for women who had a child with NTD earlier?

4000 - 5000 µg added folic acid per day. (in supplement)

What are primary sources of folic acid? Name 9

- vegetables (especially dark leafy greens)
- fruits
- Nuts
- Beans
- Seafood
- eggs
- dairy
- grains
- meat

Name 2 limitations of trying to increase your folate intake by eating more folate rich sources

- It would require large dietary changes to increase folate substantially
- Bio availability of folate in food is lower than folic acid in supplement

Where, how and why is food fortified with folic acid? How much extra folic acid is reached this way?

In the us, grains are fortified with folic acid. Its to decrease NTD. It leads to an additional daily intake of around 100 µg folic acid a day.

What is the risk of too much folate in relation to B12?

B11 could mask B12 deficiency because it will solve anemia. Then you wouldnt go to the docter, because a B12 deficiency is much later noticed in other ways.

How is folate related to homocysteine?

Homocysteine is a sulfur containing amino acid that is produced from methionine.
Folate plays a part (with B6 and B12) in converging homocysteine to methoinine, with inadequate folate levels the homocysteine levels are too high. There is an association with high homocysteine levels and CVD, but the mechanism is not clear.

How much added reduction in homocysteine can be reached by providing B12 next to a B11 supplementation?

additional 7% reduction of homocysteine becase of B12 added.

How much reduction in homocysteine can be reached by B11 supplementation? (0,8 mg/day)

25% reduction of homocysteine in non-fortified population (countries where foods are not fortified with B11)
15% reduction of homocysteine in fortified population (countries where foods are fortified with B11)

What is the effect of B6 added to B11 for homocysteine levels?

There is no effect of adding B6.

What is the body of evidence for B11 and CVD?

We know B11 lowers homocysteine, and high homocysteine levels increase risk of CVD, but unclear if B11 lowers risk of CVD.
- observational studies show an decreased risk of B11 and CVD
- intervention studies dont confirm a lower risk of CVD for B11.
So: uncertain evidence.

What is the body of evidence for B11 and colorectal cancer?

Higher folate intake has been associated with lower colorectal cancer risk,
but excessive folate intake also may promote tumor progression. The role of unmetabolized folate is unknown.
The body of evidence is uncertain. Folate may increase risk or may decrease risk. It may prevent tumors but also promote existing tumor growth.

What is the body of evidence for B11 and cognition?

- (nog uitzoeken)

What is hte body of evidence for B11 and anemia?

- (nog uitzoeken)

Name 5 health outcomes that have been associated with B11

- neural tube defects
- cardiovascular disease
- colorectal cancer
- cognition
- anemia

Name 2 arguments in favor of folate fortification

- nog uitzoeken

Name 2 arguments against folate fortification

- nog uitzoeken

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