Vitamin D and your health: Breaking old rules, raising new hopes

Question 1

how many vitamins are there

Answer 1

Vitamin D is one of the 13 vitamins discovered in the early 20th century by doctors studying nutritional deficiency diseases.

Question 2

what is a vitamin

Answer 2

organics( carbon containing) chemicals ,hat must be obtained from dietary sources because they are not produced by the body’s tissues.

Question 3

How much vitamin is required

Answer 3

Vitamins play a crucial role in our body’s metabolism, but only tiny amounts are needed to fill that role.

Question 4

Which vitamin is soluble in fat

Answer 4

Vitamin D,Although vitamin D is firmly enshrined as one of the four fat-soluble vitamins, it is not technically a vitamin.

Question 5

Vit d debunks

Answer 5

But it breaks the other rules for vitamins because it’s produced in the human body,

Question 6

Nature of Vit D

Answer 6

it’s absent from all natural foods except fish and egg yolks, and even when it’s obtained from foods, it must be transformed by the body before it can do any good.

Question 7

chronic, low-grade inflammation can turn into a silent killer that contributes to

Answer 7

to cardiovas­cular disease, cancer, type 2 diabetes and other conditions. Get simple tips to fight inflammation and stay healthy

Question 8

Protect yourself from the damage of chronic inflammation.

Question 9

what’s a stroke

Answer 9

“A stroke occurs when blood flow to part of the brain is disrupted, depriving it of oxygen and crucial nutrients.”

Question 10

Vit D life cycle

Answer 10

The natural type is produced in the skin from a universally present form of cholesterol, 7-dehydrocholesterol.
. Sunlight is the key: Its ultraviolet B (UVB) energy converts the precursor to vitamin D3
dietary supplements are manufactured by exposing a plant sterol to ultraviolet energy, thus producing vitamin D2.

Because their function is almost identical, D2 and D3 are lumped together under the name vitamin D — but neither will function until the body works its magic (see figure).

The sun’s energy turns a chemical in your skin into vitamin D3, which is carried to your liver and then your kidneys to transform it to active vitamin D.

Question 11

is used for diagnosis,

Answer 11

although 25(OH)D

Question 12

although 25(OH)D can’t function until it travels to

Answer 12

kidney.

Question 13

25(OH)D , There it acquires a final pair of oxygen and hydrogen molecules to become

Answer 13

1,25 dihydroxy vitamin D;

Question 14

scientists know this active form of the vitamin,1,25 dihydroxy vitamin D;

Answer 14

1,25(OH)2D, or calcitriol,

Question 15

Vitamin D’s best-known role is to keep bones healthy by increasing

Answer 15

the intestinal absorption of calcium.

Question 16

Without enough vitamin D, the body can only absorb

Answer 16

Without enough vitamin D, the body can only absorb 10% to 15% of dietary calcium,but 30% to 40% absorption is the rule when vitamin reserves are normal

Question 17

A lack of vitamin D in children and adults

Answer 17

rickets; causes osteomalacia.,Both bone diseases are now rare in the United States, but another is on the rise — osteoporosis, the “thin bone” disease that leads to fractures and spinal deformities.

Question 18

Other Vit D uses

Answer 18

body’s tissues contain vitamin D receptors, proteins that bind to vitamin D.
the receptors capture vitamin D, enabling efficient calcium absorption

prostate to the heart, blood vessels, muscles, and endocrine glands. And work in progress suggests that good things happen when vitamin D binds to these receptors. The main requirement is to have enough vitamin D, but many Americans don’t.

Question 19

Vitamin D deficiencies were rare when

Answer 19

most men rolled up their sleeves to work in sunny fields, Because pigmentation can reduce vitamin D production in the skin by over 90%, nonwhite populations are at particular risk.

Question 20

Deficiencies are also common in patients with

Answer 20

Deficiencies are also common in patients with intestinal disorders that limit absorption of fat and those with kidney or liver diseases that reduce the conversion of vitamin D to its active form, calcitriol (1,25(OH)2D

Question 21

standards vary, most experts agree that levels of

Answer 21

25(OH)D below 20 ng/ml (nanograms per milliliter) reflect clear-cut vitamin D inadequacy, while levels between 20 and 30 ng/ml are borderline.

Question 22

Sunlight contains two forms of radiant energy,

Answer 22

unlight contains two forms of radiant energy, ultraviolet A (UVA) and ultraviolet B (UVB). UVB provides the energy your skin needs to make vitamin D, but that energy can burn the skin and increase the cell damage that leads to cancer. UVA also contributes to skin damage and premature aging.

Question 23

blood calcium is critical for

Answer 23

neuromuscular and cardiac function, the body does not allow levels to fall. Instead, it pours out parathyroid hormone, which mobilizes calcium from bone., Blood calcium levels remain normal, so your heart and nerves keep working nicely. But your bones bear the brunt: As bone calcium density falls, bones become weak and fracture-prone.

Question 24

Dosage

Answer 24

others a combination of D and varying doses of calcium; and some administer 400 international units (IU) of vitamin D a day, others up to 800 IU a day.

Question 25

Vitamin D

Answer 25

cell growth.
Laboratory experiments suggest that it helps prevent the unrestrained cell multiplication that characterizes cancer by reducing cell division,
restricting tumor blood supply (angiogenesis),
increasing the death of cancer cells (apoptosis), and
limiting the spread of cancer cells (metastasis).

Question 26

The Harvard scientists speculate that the problem is not

Answer 26

calcium itself but a relative lack of active vitamin D.

Question 27

The risk of ————— to rise in populations at latitudes far from the equator.

Answer 27

colon cancer, breast cancer, and other malignancies appears

Question 28

The most widely used recommended dietary allowance (RDA) for vitamin D

Answer 28

600 IU daily for adults up to age 69 and 800 IU daily for people older than 70.

Question 29

Like the other fat-soluble vitamins, vitamin D is stored in the body’s

Answer 29

adipose (fat) tissue.That means your body can mobilize its own reserves if your daily intake falters temporarily — but it also means that excessive doses of vitamin D can build up to toxic levels.

Question 30

Vit D too much

Answer 30

blood calcium to levels that can cause grogginess, constipation, and even death. But it takes massive overdosing to produce toxicity.

Question 31

although cod liver oil is rich in vitamin D, it has to

Answer 31

o much vitamin A for regular use.

Question 32

An egg yolk will provide about 20 IU, but since it

Answer 32

also contains nearly a day’s quota of cholesterol, you can’t very well use eggs to fill your tank with D.

Question 33

to get just 400 IU vitamin D

Answer 33

but you’ll have to eat about 5 ounces of salmon, 7 ounces of halibut, 30 ounces of cod, or nearly two 8-ounce cans of tuna