science

Vitamin D deficiency in Australia

Vitamin D deficiency in Australia is a science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Vitamin D deficiency in Australia rather than just read about it. In short: Vitamin D deficiency in Australia has been estimated as afflicting nearly one-quarter of all adults. Background Importance of vitamin D Vitamin D plays an important role in which it supports calcium absorption in the body, sustaining good bone health as well as muscle function.

Key takeaways

Vitamin D deficiency in Australia belongs to science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Vitamin D deficiency in Australia to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Vitamin D deficiency in Australia from memory before moving on to harder problems.

Reference excerpt

Vitamin D deficiency in Australia has been estimated as afflicting nearly one-quarter of all adults.

Background

Importance of vitamin D

Vitamin D plays an important role in which it supports calcium absorption in the body, sustaining good bone health as well as muscle function. When calcium in the body becomes under provided for normal bodily functions, calcitriol, an active form of Vitamin D, pairs with parathyroid hormone. Together they act to assemble cells in order to increase the calcium stores taken from bone. Additionally, if you consume vitamin D through your diet, or make vitamin D in your skin from UVB exposure, it is processed through two organs before it becomes activated. Vitamin D is first processed in the liver, before heading to the kidneys where it becomes activated to the form 1-25 dihydroxy vitamin D or alternatively named chemical calcitriol.

Vitamin D deficiency Vitamin D deficiency historically used to be identified through counting cases of rickets. The old theory was that if someone had enough vitamin D to prevent rickets and osteomalacia, two skeletal disorders, they were considered safe from a deficiency. Nowadays through technological advancements Vitamin D deficiencies are now identified and thus calculated through the measurement of the serum 25-OH. According to the Australian Bureau of Statistics National Health Measures Survey (NHMS), the recommend Vitamin D levels to determine deficiency are categorised as follows:

Adequate levels: > 50 nmol/L Mild deficiency: 30–49 nmol/L Moderate deficiency: 13–29 nmol/L Severe deficiency: < 13 nmol/L In 1997, the prevalence of deficiency, defined as <17.5 nmol/L, was 2.8%, and the prevalence of insufficiency, defined as <37.5 nmol/L, was 27.6% among Australians over the age of 15. In 2011–2012, 23% of adults had a deficiency defined as below 49 nmol/L.

Health effects The health impacts commonly caused by deficiency of Vitamin D are rickets in children and osteoporosis in the elderly populations.

Rickets Rickets can be traced back to the 1600s, where a pandemic arose with children around the globe from Vitamin D deficiency. The inadequate intake of UV exposure consequently lead children to numerous health problems such as, growth retardation, muscle weakness, skeletal deformities, hypocalcemia, tetany and seizures. During the late 19th century autopsies conducted in the Netherlands concluded that 80–90% of children were suffering from Rickets. The incidents of rickets observed within Sydney hospitals during the years of 2003–2004 have doubled. This major spike can be attributed to the growing population of migrants in Australia, many of whom are considered at high risk of vitamin D deficiency.

Osteoporosis Because of the high prevalence of vitamin D deficiency alongside the ageing of Australia's population, conditions such as osteoporosis have become widespread among Australians over 60. Osteoporosis can be defined as very fragile and brittle bones, in which serious fractures can occur with just the slightest bump or fall. Osteoporosis Australia have predicted that half of all women and one third of men over the age of 60 years will suffer the debilitating effects of osteoporosis.

High-risk groups

Age Several studies conducted in Australia have revealed a deficiency ranging from 15 to 52% amongst the senior population. These deficiencies have been found to be higher amongst those who are home bound or living within institutions with less access to sun exposure. Vitamin D concentration levels below 28 nmol/L are common amongst the studies conducted. Throughout Sydney nursing home studies, it has been revealed that 86% of woman and 68% of men are falling into the moderate deficiency range. In a study based in Western Australia, 63% of patients admitted with hip fractures were observed to have serum levels less than 50 nmol/L compared to 25% in the control group.

Skin colour and cultural reasons to avoid sunlight In Australia, vitamin D deficiency has been recognised within particular subgroups such as aged, dark skinned of all ages, and veiled women. Dark skin has high levels of melanin pigmentation which decreases the cutaneous production of vitamin D. Compared with those of European descent, African-Americans require six times more UVB dosage to stimulate the same production of vitamin D in the skin.

Sun exposure Despite Australia having a sunny climate, Australians are falling short of adequate levels of ultraviolet B (UVB) light from the sun. Associated factors contributing to the low vitamin D levels are seasonal variations such as winter, when there is minimal sunlight, less time spent outdoors, and people cover up due to cold weather. Environmental factors that impact vitamin D production are the elevation of the sun above the horizon and amount of cloud cover. To ensure adequate vitamin D levels are reached, an average daily exposure, roughly 10% of the sunburn threshold is required on a significant area of skin, not just on the back of the hands. A burn time for a fair-skinned person could be limited to just 8 minutes in the middle of the day, during summer without sunscreens. A dark skinned person may need 45 minutes, while a covered individual might need several hours to achieve that same required exposure. The strength of the UVB changes throughout the day, so exposure time will need to change accordingly.

Obesity There is conflicting evidence to suggest whether obesity contributes to vitamin D deficiency. Obese individuals have an increased risk of being vitamin D deficient likely caused by lack of sun exposure from reduced mobility and or low levels of physical activity. The serum levels of obese Australian were 8.3- 9.5 nmol/L lower in both genders comparable to those of healthy weight ranges. During the AusDiab study conducted throughout Australia serum levels within obese people were shown to be 57% lower than with normal weight after receiving the same amount of UV exposure.

… excerpt ends here. Continue reading the full article.

Illustrations

Worked examples

Example 1 — a first encounter with Vitamin D deficiency in Australia

Start with the simplest possible case. Write down what Vitamin D deficiency in Australia claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Vitamin D deficiency in Australia before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Vitamin D deficiency in Australia ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Vitamin D deficiency in Australia

In research: Vitamin D deficiency in Australia appears in science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Vitamin D deficiency in Australia in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Vitamin D deficiency in Australia is common in secondary-school and first-year university syllabi. It links to neighbouring topics Health in Australia, Vitamin deficiencies, so understanding it makes those chapters shorter.
In everyday life: Look for Vitamin D deficiency in Australia outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Vitamin D deficiency in Australia in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Vitamin D deficiency in Australia means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Vitamin D deficiency in Australia out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Vitamin D deficiency in Australia in simple terms?

Vitamin D deficiency in Australia has been estimated as afflicting nearly one-quarter of all adults. Background Importance of vitamin D Vitamin D plays an important role in which it supports calcium absorption in the body, sustaining good bone health as well as muscle function.

Why does Vitamin D deficiency in Australia matter?

Because it connects several science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Vitamin D deficiency in Australia?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Vitamin D deficiency in Australia.