What are house dust mites and how do I know if I’m allergic to them?
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People often believe they are allergic to house dust. But of the 20% of Australians suffereing with allergies, a number are are actually allergic to microscopic house dust mites.
House dust mites belong to the same family as spiders and ticks. They measure just 0.2-0.3 mm, with 50 fitting on a single pinhead. They live for 65–100 days, and females lay 60–100 eggs in their life.
House dust mites love temperate climates and humidity. They feed off the skin cells we and animals shed, as well as mould, which they digest using special enzymes. These enzymes are excreted in their poo about 20 times a day. They also shed fragments of their exoskeletons.
All these fragments trigger allergies in people with this type of allergic rhinitis (which is also known as hay fever)
What are the symptoms?
When people with house dust mite allergy inhale the allergens, they penetrate the mucous membranes of the airways and eyes. Their body recognises the allergens as a threat, releasing chemicals including one called histamine.
This causes symptoms including a runny nose, an itchy nose, eyes and throat, sneezing, coughing and a feeling of mucus at the back of your throat (known as a post-nasal drip).
People with this type of allergy usually mouth breath, snore, rub their nose constantly (creating a nasal crease called the “dust mite salute”) and have dark shadows under their eyes.
House dust mite allergy can also cause poor sleep, constant tiredness, reduced concentration at work or school and lower quality of life.
For people with eczema, their damaged skin barrier can allow house dust mite proteins in. This prompts immune cells in the skin to release chemicals which make already flared skin become redder, sorer and itchier, especially in children.
Symptoms of house dust mite allergy occur year round, and are often worse after going to bed and when waking in the morning. But people with house dust mite allergy and pollen allergies find their year-round symptoms worsen in spring.
How is it diagnosed?
House dust mite allergy symptoms often build up over months, or even years before people seek help. But an accurate diagnosis means you can not only access the right treatment – it’s also vital for minimising exposure.
Doctor and nurse practitioners can order a blood test to check for house dust mite allergy.
Alternatively, health care providers with specialised allergy training can perform skin prick tests. This involves placing drops of the allergens on the arm, along with a positive and negative “control”. After 15 minutes, those who test positive will have developed a mosquito bite-like mark.
How is it treated?
Medication options include one or a combination of:
- daily non-sedating antihistamines
- a steroid nasal spray
- allergy eye drops.
Your health care professional will work with you to develop a rhinitis (hay fever) medical management plan to reduce your symptoms. If you’re using a nasal spray, your health provider will show you how to use it, as people often use it incorrectly.
If you also have asthma or eczema which is worsened by dust mites, your health provider will adapt your asthma action plan or eczema care plan accordingly.
If you experience severe symptoms, a longer-term option is immunotherapy. This aims to gradually turn off your immune system’s ability to recognise house dust mites as a harmful allergen.
Immunotherapy involves taking either a daily sublingual tablet, under the tongue, or a series of injections. Injections require monthly attendances over three years, after the initial weekly build-up phase.
These are effective, but are costly (as well as time-consuming). So it’s important to weigh up the potential benefits and downsides with your health-care provider.
How can you minimise house dust mites?
There are also important allergy minimisation measures you can take to reduce allergens in your home.
Each week, wash your bedding and pyjamas in hot water (over 60°C). This removes house dust mite eggs and debris.
Opt for doonas, covers or quilts that can be washed in hot water above 60°C. Alternatively, low-cost waterproof or leak proof covers can keep house dust mites out.
If you can, favour blinds and wood floors over curtains and carpet. Dust blinds and surfaces with a damp cloth each week and vacuum while wearing a mask, or have someone else do it, as house dust mites can become airborne during cleaning.
But beware of costly products with big marketing budgets and little evidence to support their use. A new mattress, for example, will always be house dust mite-free. But once slept on, the house dust mite life cycle can start.
Mattress protectors and toppers commonly claim to be “hypoallergenic”, “anti-allergy” or “allergy free”. But their pore sizes are not small enough to keep house dust mites and their poo out, or shed skin going through.
Sprays claiming to kill mites require so much spray to penetrate the product that it’s likely to become wet, may smell like the spray and, unless dried properly, may grow mould.
Finally, claims that expensive vacuum cleaners can extract all the house dust mites are unsubstantiated.
For more information, visit healthdirect.gov.au or the Australian Society of Clinical Immunology and Allergy.
Deryn Lee Thompson, Eczema and Allergy Nurse; Lecturer, University of South Australia
This article is republished from The Conversation under a Creative Commons license. Read the original article.
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Wasting Your Vitamins?
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Are you flushing away your vitamins?
Most likely…but you don’t have to.
We all know what a wasteful expense supplements can sometimes be, but you can optimise your intake to get more bang for your buck!
Top Tips for Getting Your Money’s Worth:
- Liquids are better than tablets—the body can’t absorb nutrients from tablets anywhere as easily as it can from liquids, with some saying as low as a 50% absorption rate for tablets, so if your supplement can come in drinkable form, take it that way!
- Capsules are better than tablets—capsules, depending on the kind, contain either a powder (true capsules) or a liquid (softgels). Once the capsule/softgel is broken down in the stomach, it releases its contents, which will now be absorbed as though you took it as a drink.
- Stay hydrated—on that note, your body can only make use of nutrients that it can easily transport, and if you’re dehydrated, the process is sluggish! Having a big glass of water with your supplements will go a long way to helping your body get them where they’re needed.
- Take with black pepper—studies disagree on exactly how much black pepper improves absorption of nutrients. Some say it improves it by 50%, others say as much as 7x better. The truth is probably that it varies from one nutrient to the next, but what is (almost) universally accepted is that black pepper helps you absorb many nutrients you take orally.
- Take with a meal—bonus if you seasoned it with black pepper! But also: many nutrients are best absorbed alongside food, and many are specifically fat-soluble (so you want to take a little fat around the same time for maximum absorption)
- Consider split doses—a lot of nutrients are best absorbed when spread out a bit. Why? Your body can often only absorb so much at once, and what it couldn’t absorb can, depending on the nutrient, pass right through you. So better to space out the doses—breakfast and dinner make for great times to take them.
- Consider cycling—no, not the two-wheeled kind, though feel free to do that too! What cycling means when it comes to supplements is to understand that your body can build a tolerance to some supplements, so you’ll get gradually less effect for the same dose. Combat this by scheduling a break—five days on, two days off is a common schedule—allowing your body to optimise itself in the process!
- Check Medications—and, as is always safe, make sure you check whether any medications you take can interrupt your supplement absorption!
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From straight to curly, thick to thin: here’s how hormones and chemotherapy can change your hair
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Head hair comes in many colours, shapes and sizes, and hairstyles are often an expression of personal style or cultural identity.
Many different genes determine our hair texture, thickness and colour. But some people’s hair changes around the time of puberty, pregnancy or after chemotherapy.
So, what can cause hair to become curlier, thicker, thinner or grey?
Curly or straight? How hair follicle shape plays a role
Hair is made of keratin, a strong and insoluble protein. Each hair strand grows from its own hair follicle that extends deep into the skin.
Curly hair forms due to asymmetry of both the hair follicle and the keratin in the hair.
Follicles that produce curly hair are asymmetrical and curved and lie at an angle to the surface of the skin. This kinks the hair as it first grows.
The asymmetry of the hair follicle also causes the keratin to bunch up on one side of the hair strand. This pulls parts of the hair strand closer together into a curl, which maintains the curl as the hair continues to grow.
Follicles that are symmetrical, round and perpendicular to the skin surface produce straight hair.
Each hair strand grows from its own hair follicle.
Mosterpiece/ShutterstockLife changes, hair changes
Our hair undergoes repeated cycles throughout life, with different stages of growth and loss.
Each hair follicle contains stem cells, which multiply and grow into a hair strand.
Head hairs spend most of their time in the growth phase, which can last for several years. This is why head hair can grow so long.
Let’s look at the life of a single hair strand. After the growth phase is a transitional phase of about two weeks, where the hair strand stops growing. This is followed by a resting phase where the hair remains in the follicle for a few months before it naturally falls out.
The hair follicle remains in the skin and the stems cells grow a new hair to repeat the cycle.
Each hair on the scalp is replaced every three to five years.
Each hair on the scalp is replaced every three to five years.
Just Life/ShutterstockHormone changes during and after pregnancy alter the usual hair cycle
Many women notice their hair is thicker during pregnancy.
During pregnancy, high levels of oestrogen, progesterone and prolactin prolong the resting phase of the hair cycle. This means the hair stays in the hair follicle for longer, with less hair loss.
A drop in hormones a few months after delivery causes increased hair loss. This is due to all the hairs that remained in the resting phase during pregnancy falling out in a fairly synchronised way.
Hair can change around puberty, pregnancy or after chemotherapy
This is related to the genetics of hair shape, which is an example of incomplete dominance.
Incomplete dominance is when there is a middle version of a trait. For hair, we have curly hair and straight hair genes. But when someone has one curly hair gene and one straight hair gene, they can have wavy hair.
Hormonal changes that occur around puberty and pregnancy can affect the function of genes. This can cause the curly hair gene of someone with wavy hair to become more active. This can change their hair from wavy to curly.
Researchers have identified that activating specific genes can change hair in pigs from straight to curly.
Chemotherapy has very visible effects on hair. Chemotherapy kills rapidly dividing cells, including hair follicles, which causes hair loss. Chemotherapy can also have genetic effects that influence hair follicle shape. This can cause hair to regrow with a different shape for the first few cycles of hair regrowth.
Your hair can change at different stages of your life.
Igor Ivakhno/ShutterstockHormonal changes as we age also affect our hair
Throughout life, thyroid hormones are essential for production of keratin. Low levels of thyroid hormones can cause dry and brittle hair.
Oestrogen and androgens also regulate hair growth and loss, particularly as we age.
Balding in males is due to higher levels of androgens. In particular, high dihydrotestosterone (sometimes shortened to DHT), which is produced in the body from testosterone, has a role in male pattern baldness.
Some women experience female pattern hair loss. This is caused by a combination of genetic factors plus lower levels of oestrogen and higher androgens after menopause. The hair follicles become smaller and smaller until they no longer produce hairs.
Reduced function of the cells that produce melanin (the pigment that gives our hair colour) is what causes greying.
Theresa Larkin, Associate professor of Medical Sciences, University of Wollongong
This article is republished from The Conversation under a Creative Commons license. Read the original article.
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The Menopause Brain – by Dr. Lisa Mosconi
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With her PhD in neuroscience and nuclear medicine (a branch of radiology, used for certain types of brain scans, amongst other purposes), whereas many authors will mention “brain fog” as a symptom of menopause, Dr. Mosconi can (and will) point to a shadowy patch on a brain scan and say “that’s the brain fog, there”.
And so on for many other symptoms of menopause that are commonly dismissed as “all in your head”, notwithstanding that “in your head” is the worst place for a problem to be. You keep almost your entire self in there!
Dr. Mosconi covers how hormones influence not just our moods in a superficial way, but also change the structure of our brain over time.
Importantly, she also gives an outline of how to stay on the ball; what things to watch out for when your doctor probably won’t, and what things to ask for when your doctor probably won’t suggest them.
Bottom line: if menopause is a thing in your life (or honestly, even if it isn’t but you are running on estrogen rather than testosterone), then this is a book for you.
Click here to check out The Menopause Brain, and look after yours!
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Is it OK to lie to someone with dementia?
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There was disagreement on social media recently after a story was published about an aged care provider creating “fake-away” burgers that mimicked those from a fast-food chain, to a resident living with dementia. The man had such strict food preferences he was refusing to eat anything at meals except a burger from the franchise. This dementia symptom risks malnutrition and social isolation.
But critics of the fake burger approach labelled it trickery and deception of a vulnerable person with cognitive impairment.
Dementia is an illness that progressively robs us of memories. Although it has many forms, it is typical for short-term recall – the memory of something that happened in recent hours or days – to be lost first. As the illness progresses, people may come to increasingly “live in the past”, as distant recall gradually becomes the only memories accessible to the person. So a person in the middle or later stages of the disease may relate to the world as it once was, not how it is today.
This can make ethical care very challenging.
Pikselstock/Shutterstock Is it wrong to lie?
Ethical approaches classically hold that specific actions are moral certainties, regardless of the consequences. In line with this moral absolutism, it is always wrong to lie.
But this ethical approach would require an elderly woman with dementia who continually approaches care staff looking for their long-deceased spouse to be informed their husband has passed – the objective truth.
Distress is the likely outcome, possibly accompanied by behavioural disturbance that could endanger the person or others. The person’s memory has regressed to a point earlier in their life, when their partner was still alive. To inform such a person of the death of their spouse, however gently, is to traumatise them.
And with the memory of what they have just been told likely to quickly fade, and the questioning may resume soon after. If the truth is offered again, the cycle of re-traumatisation continues.
People with dementia may lose short term memories and rely on the past for a sense of the world. Bonsales/Shutterstock A different approach
Most laws are examples of absolutist ethics. One must obey the law at all times. Driving above the speed limit is likely to result in punishment regardless of whether one is in a hurry to pick their child up from kindergarten or not.
Pragmatic ethics rejects the notion certain acts are always morally right or wrong. Instead, acts are evaluated in terms of their “usefulness” and social benefit, humanity, compassion or intent.
The Aged Care Act is a set of laws intended to guide the actions of aged care providers. It says, for example, psychotropic drugs (medications that affect mind and mood) should be the “last resort” in managing the behaviours and psychological symptoms of dementia.
Instead, “best practice” involves preventing behaviour before it occurs. If one can reasonably foresee a caregiver action is likely to result in behavioural disturbance, it flies in the face of best practice.
What to say when you can’t avoid a lie?
What then, becomes the best response when approached by the lady looking for her husband?
Gentle inquiries may help uncover an underlying emotional need, and point caregivers in the right direction to meet that need. Perhaps she is feeling lonely or anxious and has become focused on her husband’s whereabouts? A skilled caregiver might tailor their response, connect with her, perhaps reminisce, and providing a sense of comfort in the process.
This approach aligns with Dementia Australia guidance that carers or loved ones can use four prompts in such scenarios:
- acknowledge concern (“I can tell you’d like him to be here.”)
- suggest an alternative (“He can’t visit right now.”)
- provide reassurance (“I’m here and lots of people care about you.”)
- redirect focus (“Perhaps a walk outside or a cup of tea?”)
These things may or may not work. So, in the face of repeated questions and escalating distress, a mistruth, such as “Don’t worry, he’ll be back soon,” may be the most humane response in the circumstances.
Different realities
It is often said you can never win an argument with a person living with dementia. A lot of time, different realities are being discussed.
So, providing someone who has dementia with a “pretend” burger may well satisfy their preferences, bring joy, mitigate the risk of malnutrition, improve social engagement, and prevent a behavioural disturbance without the use of medication. This seems like the correct approach in ethical terms. On occasion, the end justifies the means.
Steve Macfarlane, Head of Clinical Services, Dementia Support Australia, & Associate Professor of Psychiatry, Monash University
This article is republished from The Conversation under a Creative Commons license. Read the original article.
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Super Joints – by Pavel Tsatsouline
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For those of us for whom mobility and pain-free movement are top priorities, this book has us covered. So what’s different here, compared to your average stretching book?
It’s about functional strength with the stretches. The author’s background as a special forces soldier means that his interest was not in doing arcane yoga positions so much as being able to change direction quickly without losing speed or balance, get thrown down and get back up without injury, twist suddenly without unpleasantly wrenching anything (of one’s own, at least), and generally be able to take knocks without taking damage.
While we are hopefully not having to deal with such violence in our everyday lives, the robustness of body that results from these exercises is one that certainly can go a long way to keep us injury-free.
The exercises themselves are well-described, clearly and succinctly, with equally clear illustrations.
Note: the paperback version is currently expensive, probably due to supply and demand, but if you select the Kindle version, it’s much cheaper with no loss of quality (because the illustrations are black-on-white line-drawings and very clear; perfect for Kindle e-ink)
The style of the book is very casual and conversational, yet somehow doesn’t let that distract it from being incredibly information dense; there is no fluff here, just valuable guidance.
Bottom line: if you would like to be more robust with non-nonsense exercises, then this book is a fine choice.
Click here to check out Super Joints, and make yours flexible and strong!
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Men have a biological clock too. Here’s what’s more likely when dads are over 50
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We hear a lot about women’s biological clock and how age affects the chance of pregnancy.
New research shows men’s fertility is also affected by age. When dads are over 50, the risk of pregnancy complications increases.
Data from more than 46 million births in the United States between 2011 and 2022 compared fathers in their 30s with fathers in their 50s.
While taking into account the age of the mother and other factors known to affect pregnancy outcomes, the researchers found every ten-year increase in paternal age was linked to more complications.
The researchers found that compared to couples where the father was aged 30–39, for couples where the dad was in his 50s, there was a:
- 16% increased risk of preterm birth
- 14% increased risk of low birth weight
- 13% increase in gestational diabetes.
The older fathers were also twice as likely to have used assisted reproductive technology, including IVF, to conceive than their younger counterparts.
Steven van Loy/Unsplash Dads are getting older
In this US study, the mean age of all fathers increased from 30.8 years in 2011 to 32.1 years in 2022.
In that same period, the proportion of men aged 50 years or older fathering a child increased from 1.1% to 1.3%.
We don’t know the proportion of men over 50 years who father children in Australia, but data shows the average age of fathers has increased.
In 1975 the median age of Australian dads was 28.6 years. This jumped to 33.7 years in 2022.
How male age affects getting pregnant
As we know from media reports of celebrity dads, men produce sperm from puberty throughout life and can father children well into old age.
However, there is a noticeable decline in sperm quality from about age 40.
Female partners of older men take longer to achieve pregnancy than those with younger partners.
A study of the effect of male age on time to pregnancy showed women with male partners aged 45 or older were almost five times more likely to take more than a year to conceive compared to those with partners aged 25 or under. More than three quarters (76.8%) of men under the age of 25 years impregnated their female partners within six months, compared with just over half (52.9%) of men over the age of 45.
Pooled data from ten studies showed that partners of older men are also more likely to experience miscarriage. Compared to couples where the male was aged 25 to 29 years, paternal age over 45 years increased the risk of miscarriage by 43%.
Older men are more likely to need IVF
Outcomes of assisted reproductive technology, such as IVF, are also influenced by the age of the male partner.
A review of studies in couples using assisted reproductive technologies found paternal age under 40 years reduced the risk of miscarriage by about 25% compared to couples with men aged over 40.
Having a male under 40 years also almost doubled the chance of a live birth per treatment cycle. With a man over 40, 17.6% of treatment rounds resulted in a live birth, compared to 28.4% when the male was under 40.
How does male age affect the health outcomes of children?
As a result of age-related changes in sperm DNA, the children of older fathers have increased risk of a number of conditions. Autism, schizophrenia, bipolar disorders and leukaemia have been linked to the father’s advanced years.
A review of studies assessing the impact of advanced paternal age reported that children of older fathers have increased rates of psychiatric disease and behavioural impairments.
But while the increased risk of adverse health outcomes linked to older paternal age is real, the magnitude of the effect is modest. It’s important to remember that an increase in a very small risk is still a small risk and most children of older fathers are born healthy and develop well.
Improving your health can improve your fertility
In addition to the effects of older age, some chronic conditions that affect fertility and reproductive outcomes become more common as men get older. They include obesity and diabetes which affect sperm quality by lowering testosterone levels.
While we can’t change our age, some lifestyle factors that increase the risk of pregnancy complications and reduce fertility, can be tackled. They include:
- smoking
- recreational drug taking
- anabolic steroid use
- heavy alcohol consumption.
Get the facts about the male biological clock
Research shows men want children as much as women do. And most men want at least two children.
Yet most men lack knowledge about the limitations of female and male fertility and overestimate the chance of getting pregnant, with and without assisted reproductive technologies.
We need better public education, starting at school, to improve awareness of the impact of male and female age on reproductive outcomes and help people have healthy babies.
For men wanting to improve their chance of conceiving, the government-funded sites Healthy Male and Your Fertility are a good place to start. These offer evidence-based and accessible information about reproductive health, and tips to improve your reproductive health and give your children the best start in life.
Karin Hammarberg, Senior Research Fellow, Global and Women’s Health, School of Public Health & Preventive Medicine, Monash University
This article is republished from The Conversation under a Creative Commons license. Read the original article.
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