Nutritional All-Star: Folic
Acid
This B vitamin is a pregnant woman's best friend, since
it reduces spinal-cord birth defects by up to 50%.
In
addition, it lowers the body's level of an amino acid that may contribute to heart disease & possibly helps reduce
the risk of colon cancer.
What women need:
What women get:
Add to your diet:
-
Fortified cereal (100 to
400 mcg)
-
½
cup garbanzo beans (140 mcg)
-
½
cup kidney beans (115 mcg)
-
6 ozs. orange juice
-
1 cup dark green leafy lettuce (100mcg)
-
1 cup cooked pasta (100
mcg)
-
¼
cup wheat germ (80 mcg)
-
½
cup asparagus (70 mcg)
-
¾
cup cooked white rice (60 mcg)
-
1 cup grapefruit
juice (50 mcg)
Where do we get folate?
In 1990, more than 1/3 of the folate in the American diet was provided by fruits & vegetables. Grain products contributed a little more than 1/5 & legumes, nuts & seeds contributed a little less than 1/5.
Foods that contain small amounts
of folate but aren't considered good sources can contribute significant amounts of folate to an individual's diet if these foods are eaten often or in large amounts.
Good Sources of Folate |
Food |
Serving Size |
Percentage of U.S. RDA1 |
Breads, Cereals, & Other Grain Products |
English muffin, whole wheat |
1 |
+ |
Pita bread, whole wheat |
1 small |
+ |
Ready-to-eat cereals, fortified2 |
1 oz |
++ |
Wheat germ, plain |
2 Tablespoons |
+ |
|
Fruits |
Grapefruit & orange juice, frozen, reconstituted |
3/4 cup |
+ |
Orange juice: |
Fresh |
3/4 cup |
+ |
Frozen, reconstituted |
3/4 cup |
+ |
Vegetables |
Artichoke, globe (French), cooked |
1 medium |
+ |
Asparagus, cooked |
1/2 cup |
+ |
Beets, cooked |
1/2 cup |
+ |
Broccoli, cooked |
1/2 cup |
+ |
Brussels sprouts, cooked |
1/2 cup |
+ |
Cauliflower, cooked |
1/2 cup |
+ |
Chinese cabbage, cooked |
1/2 cup |
+ |
Corn, cream style, cooked |
1/2 cup |
+ |
Endive, chicory, romaine, or escarole, raw |
1 cup |
+ |
Mustard greens, cooked |
1/2 cup |
+ |
Okra, cooked |
1/2 cup |
+ |
Parsnips, cooked |
1/2 cup |
+ |
Peas, green, cooked |
1/2 cup |
+ |
Spinach: |
cooked |
1/2 cup |
++ |
raw |
1 cup |
+ |
Turnip greens, cooked |
1/2 cup |
+ |
|
Meat, Poultry, Fish & Alternates |
Liver, braised: |
|
|
Beef or calf |
3 ozs |
+++ |
Pork |
3 ozs |
++ |
Chicken or turkey |
1/2 cup diced |
+++ |
|
Fish & Seafood |
Crabmeat, steamed |
3 ozs |
+ |
|
Dry Beans, Peas & Lentils |
Beans, cooked: |
Bayou, black, brown, calico, chickpeas (garbanzo beans), lima, Mexican, pinto, or white |
1/2 cup |
+ |
Black-eyed peas (cowpeas) |
1/2 cup |
+++ |
Red kidney |
1/2 cup |
++ |
Lentils, cooked |
1/2 cup |
+++ |
Peas, split, green or yellow, cooked |
1/2 cup |
+ |
1 A selected serving size contains: |
+ 10-24% of the US RDA for adults & children over 4 years of age |
++ 25-39% of the US RDA for adults & children over 4 years of age |
+++ 40% or more of the US RDA for adults & children over 4 years of age |
2 See section on fortified foods. |
|
Why do we need folate?
Folate, a water-soluble
vitamin, helps the body form red blood cells & aids in the formation of genetic material within every body cell.
How can we get enough
folate?
Eating a variety of foods that contain
folate is the best way to get an adequate amount. Healthy individuals who eat a balanced diet rarely need supplements.
The list of foods in the
lefthand column will help you select those foods that are good sources of folate as you
follow the Dietary Guidelines. The list of good sources was derived from the same nutritive value of foods table used to analyze
information for recent food consumption surveys of the USDA.
How to Prepare Foods
to Retain Folate
Folate can be lost from
foods during preparation, cooking, or storage.
To retain folate:
- Serve fruits & vegetables raw whenever possible.
- Steam or simmer vegetables in a minimal amount of water.
- Store vegetables in the refrigerator.
- Don't boil or microwave foods as they lose their nutritional values with
these cooking methods.
What about fortified foods?
Most ready-to-eat cereals
are fortified with folate. Fortified ready-to-eat cereals usually contain at least 25% of
the U.S. RDA for folate.
Because cereals vary,
check the label on the package for the percentage of the U.S. RDA for a specific cereal. Beginning January 1, 1998, flour
began being fortified with folate as well.
|
|
nutritional navigation
vitamins
minerals
folate - folic acid - you are here!
Heart association
removes folic acid for prevention
By Clarisse
Douaud
2/21/2007 - The American Heart Association (AHA) has removed folic acid
from its recommendation for the prevention of cardiovascular disease in women & also dismissed antioxidant supplements
for primary or secondary prevention.
The 2007 Guidelines
for Preventing Cardiovascular Disease in Women, published today in a special women's health issue of the Journal of the
American Heart Association, include recommendations for using aspirin, hormone therapy & dietary supplements
in heart disease & stroke prevention in women.
There has been controversy in
past on whether or not folic acid plays a role in heart disease prevention & this AHA verdict represents a strike against a vitamin
for which a significant number of studies have shown favorable results.
"The new guidelines
reinforce that unregulated dietary supplements aren't a method proven to prevent heart disease," said Lori Mosca, director
of preventive cardiology at New York–Presbyterian Hospital & chair of the American Heart Association expert panel
that wrote the guidelines. "For
example, recent studies have shown that folic acid is ineffective to protect the heart despite
widespread use by patients & physicians hoping for a heart benefit."
The
Council for Responsible Nutrition (CRN) disagrees with AHA's stance on folic
acid & antioxidant supplements.
"It's a little odd that they would recommend to not
use these supplements for primary or secondary prevention when really the jury is still out for primary prevention,"
Andrew Shao, CRN Vice President of Scientific & Regulatory Affairs, told NutraIngredients-USA. "We disagree with the wording
& feel it might cause people to stop taking their supplements."
Studies
have linked increased blood levels of the amino acid homocysteine to an increased risk of cardiovascular disease. It
has been suggested that by lowering levels of homocysteine in the blood, people could cut the risk of cardiovascular disease.
A meta-analysis published in November's Journal of the American Medical Association,
found folic acid had no effect on cardiovascular disease among people with existing vascular
disease. Whereas in November, a review from the British Medical Journal determined evidence supporting folic acid's role in heart health was enough for the vitamin to be recommended.
"Since
folic acid reduces homocysteine concentrations, to an extent dependent on background folate levels, it follows that increasing folic acid consumption
will reduce the risk of heart attack & stroke by an amount related to the homocysteine reduction achieved," wrote
lead author David Wald.
Folate is found in foods such as green leafy vegetables,
chick peas & lentils & an overwhelming body of evidence links has linked folate deficiency in early pregnancy to increased
risk of" neural tube defects (NTD) – most commonly spina bifida & anencephaly – in infants.
CRN also finds fault with AHA's claim that the dietary supplement industry isn't regulated.
"This is a mistake that is often made but a mistake nonetheless," said Shao.
A recent American
Heart Association survey showed that women are confused about methods to prevent heart disease including the role of
dietary supplements, aspirin & hormones.
"These recent findings emphasize the importance of
using well-conducted clinical trial data to develop national recommendations to help patients & their doctors use best
practices to prevent heart disease – practices based on data rather than myth or wishful thinking," says the
report.
The meta-analysis published in the Journal of the American Medical Association
included data for 16,958 participants from studies that compared folic acid supplementation
with either placebo for a period of at least 6 months & a maximum follow-up of 5 years. Clinical cardiovascular disease
events were reported as an end point.
Reviewing the evidence, Wald & his colleagues
from the Wolfson Institute for Preventive Medicine, Barts & the London, Queen Mary School of Medicine & Dentistry
report that while such randomized trials are important, they're not the only source of evidence.
Indeed, reviewing cohort studies led them to state that a 3 micromole per litre decrease in serum homocysteine
levels, said to be achievable with a daily folic acid intake with 0.8 milligrams, lowers
the risk of heart attack & stroke by 15 & 24%.
|
|
|
|
|
|
|
|
|
|