When spring arrives, so do warnings about thunderstorm asthma. But a decade ago, most of us hadn’t heard of it.

So where did thunderstorm asthma come from? Is it a new phenomenon?

In 2016, the world’s most catastrophic thunderstorm asthma event took Melbourne by surprise. An increase in warnings and monitoring is partly a response to this.

But there are also signs climate change may be exacerbating the likelihood of thunderstorm asthma, with more extreme weather, extended pollen seasons and a rise in Australians reporting hay fever.

A landmark catastrophe

The first time many Australians heard of thunderstorm asthma was in November 2016, when a major event rocked Melbourne.

During a late night storm, an estimated 10,000 people were rushed to hospitals with severe asthma attacks. With thousands of calls on emergency lines, ambulances and emergency departments were unprepared to handle the rapid increase in people needing urgent medical care. Tragically, ten of those people died.

This was the most catastrophic thunderstorm asthma event in recorded history and the first time deaths have ever occurred anywhere in the world.

In response, the Victorian Department of Health implemented initiatives, including public awareness campaigns and improvements to health and emergency services, to be ready for future thunderstorm asthma events.

A network of pollen monitoring stations was also set up across the state to gather data that helps to predict future events.

A problem for decades

While this event was unexpected, it wasn’t the first time we’d had thunderstorm asthma in Australia – we’ve actually known about it for decades.

Melbourne reported its first instance of thunderstorm asthma back in 1984, only a year after this phenomenon was first discovered in Birmingham in the United Kingdom.

Thunderstorm asthma has since been reported in other parts of Australia, including Canberra and New South Wales. But it is still most common in Melbourne. Compared to any other city (or country) the gap is significant: over a quarter of all known events worldwide have occurred in Melbourne.

Why Melbourne?

Melbourne’s location makes it a hotspot for these kinds of events. Winds coming from the north of Melbourne tend to be dry and hot as they come from deserts in the centre of Australia, while winds from the south are cooler as they come from the ocean.

When hot and cool air mix above Melbourne, it creates the perfect conditions for thunderstorms to form.

Northern winds also blow a lot of pollen from farmlands into the city, in particular grass pollen. This is not only the most common cause of seasonal hay fever in Melbourne but also a major trigger of thunderstorm asthma.

Why grass pollen?

There’s a particular reason grass pollen is the main culprit behind thunderstorm asthma in Australia. During storms there is a lot of moisture in the air. Grass pollen will absorb this moisture, making it swell up like a water balloon.

If pollen absorbs too much water whilst airborne, it can burst or “rupture,” releasing hundreds of microscopic particles into the air that can be swept by powerful winds.

Normally, when you breathe in pollen it gets stuck in your upper airway – for example, your nose and throat. This is what causes typical hay fever symptoms such as sneezing or runny nose.

But the microscopic particles released from ruptured grass pollen are much smaller and don’t get stuck as easily in the upper airway. Instead, they can travel deep into your airways until they reach your lungs. This may trigger more severe symptoms, such as wheezing or difficulty breathing, even in people with no prior history of asthma.

So who is at risk?

You might think asthma is the biggest risk factor for thunderstorm asthma. In fact, the biggest risk factor is hay fever.

Up to 99% of patients who went to the emergency department during the Melbourne 2016 event had hay fever, while a majority (60%) had no prior diagnosis of asthma.

Every single person hospitalised was allergic to at least one type of grass pollen. All had a sensitivity to ryegrass.

Is thunderstorm asthma becoming more common?

Thunderstorm asthma events are rare, with just 26 events officially recorded worldwide.

However there is evidence these events could become more frequent and severe in coming years, due to climate change. Higher temperatures and pollution could be making plants produce more pollen and pollen seasons last much longer.

Extreme weather events, including thunderstorms, are also expected to become more common and severe.

In addition, there are signs rates that hay fever may be increasing. The number of Australians reporting allergy symptoms have risen from 15% in 2008 to 24% in 2022. Similar trends in other countries has been linked to climate change.

How can I prepare?

Here are three ways you can reduce your risk of thunderstorm asthma:

• stock up on allergy medication and set up an asthma action plan with your GP
• check daily pollen forecasts for the estimated pollen level and risk of a thunderstorm asthma event in your local area
• on days with high pollen or a high risk of thunderstorm asthma, spend less time outside or wear a surgical face mask to reduce your symptoms.

Kira Morgan Hughes, PhD Candidate in Allergy and Asthma, School of Life and Environmental Sciences, Deakin University

This article is republished from The Conversation under a Creative Commons license. Read the original article.

Does it seem like most vegetables you serve your children end up left on the plate, or worse, strewn across the floor? But mention dessert, and your fruit skewers are polished off in an instant.

Or maybe the carrot and cucumber sticks keep coming home in your child’s lunchbox untouched, yet the orange slices are nowhere to be seen.

If you’re facing these struggles with your child, you’re not alone. Many children prefer fruit to vegetables.

So if your child eats lots of fruit but minimal or no vegetables, is that OK? And how can you get them to eat more veggies?

Children have an innate preference for fruit

The Australian Dietary Guidelines’ recommended daily intakes for vegetables and fruit depend on a child’s age.

Consumption among Australian children falls well below recommendations. Around 62.6% of children aged over two meet the recommended daily fruit intake, but only 9% meet the recommended vegetable intake.

This is not surprising given children have a natural preference for fruit. At least in part, this is due to its sweetness and texture, whether crispy, crunchy or juicy. The texture of fruit has been linked to a positive sensory experience among children.

Vegetables, on the other hand, are more of an acquired taste, and certain types, such as cruciferous vegetables, can be perceived by children as bitter.

The reason children often prefer fruit over vegetables could also be related to the parents’ preferences. Some research has even suggested we develop food preferences before birth based on what our mother consumes during pregnancy.

Balance is key

So, a preference for fruit is common. But is it OK if your child eats lots of fruit but little to no vegetables? This is a question we, as dietitians, get asked regularly.

You might be thinking, at least my child is eating fruit. They could be eating no veggies and no fruit. This is true. But while it’s great your child loves fruit, vegetables are just as important as part of a balanced eating pattern.

Vegetables provide us with energy, essential vitamins and minerals, as well as water and fibre, which help keep our bowels regular. They also support a strong immune system.

If your child is only eating fruit, they are missing some essential nutrients. But the same is true if they are eating only veggies.

Fruit likewise provides the body with a variety of essential vitamins and minerals, as well as phytochemicals, which can help reduce inflammation.

Evidence shows healthy consumption of fruit and vegetables protects against chronic diseases including high blood pressure, heart disease and stroke.

Consumed together, fruit and vegetables in a variety of colours provide different nutrients we need, some of which we can’t get from other foods. We should encourage kids to eat a “rainbow” of fruit and vegetables each day to support their growth and development.

What if my child eats too much fruit?

If your child is eating slightly more fruit than what’s recommended each day, it’s not usually a problem.

Fruit contains natural sugar which is good for you. But too much of a good thing, even if it’s natural, can create problems. Fruit also contains virtually no fat and very little to no protein, both essential for a growing child.

When overindulging in fruit starts to displace other food groups such as vegetables, dairy products and meat, that’s when things can get tricky.

6 tips to get your kids to love vegetables

1. Get them involved

Take your child with you when you go shopping. Let them choose new vegetables. See if you can find vegetables even you haven’t tried, so you’re both having a new experience. Then ask them to help you with preparing or cooking the vegetables using a recipe you have chosen together. This will expose your child to veggies in a positive way and encourage them to eat more.

2. Sensory learning

Try to expose your child to vegetables rather than hiding them. Kids are more likely to eat veggies when they see, smell and feel them. This is called sensory learning.

3. Have fun with food

Use colourful vegetables of different sizes and textures. Make them fun by creating scenes or faces on your child’s plate. Add edible flowers or mint for decoration. You can even serve this with a side of veggie-based dip such as hummus or guacamole for some bonus healthy fats.

4. Teach them to grow their own

Teach your child how to grow their own vegetables. Evidence shows kids are more inclined to try the food they have helped and watched grow. You don’t need to have a big backyard to do this. A windowsill with a pot plant is a perfect start.

5. Lead by example

Your child learns from you, and your eating habits will influence theirs. Ensure they see you eating and enjoying veggies, whether in meals or as snacks.

6. Practise persistence

If your child refuses a particular vegetable once, don’t give up. It can take many attempts to encourage children to try a new food.

Yasmine Probst, Associate Professor, School of Medical, Indigenous and Health Sciences, University of Wollongong; Olivia Wills, Accredited Practising Dietitian, PhD candidate, University of Wollongong, and Shoroog Allogmanny, Accredited Practising Dietitian, PhD candidate, University of Wollongong

This article is republished from The Conversation under a Creative Commons license. Read the original article.