Beetroot has been in the news for all the wrong reasons. Supply issues in recent months have seen a shortage of tinned beetroot on Australian supermarket shelves. At one point, a tin was reportedly selling on eBay for more than A$65.

But as supplies increase, we turn our attention to beetroot’s apparent health benefits.

Is beetroot really vegetable Viagra, as UK TV doctor Michael Mosley suggests? What about beetroot’s other apparent health benefits – from reducing your blood pressure to improving your daily workout? Here’s what the science says.

What’s so special about beetroot?

Beetroot – alongside foods such as berries, nuts and leafy greens – is a “superfood”. It contains above-average levels per gram of certain vitamins and minerals.

Beetroot is particularly rich in vitamin B and C, minerals, fibre and antioxidants.

Most cooking methods don’t significantly alter its antioxidant levels. Pressure cooking does, however, lower levels of carotenoid (a type of antioxidant) compared to raw beetroot.

Processing into capsules, powders, chips or juice may affect beetroot’s ability to act as an antioxidant. However, this can vary between products, including between different brands of beetroot juice.

Is beetroot really vegetable Viagra?

The Romans are said to have used beetroot and its juice as an aphrodisiac.

But there’s limited scientific evidence to say beetroot improves your sex life. This does not mean it doesn’t. Rather, the vast number of scientific studies looking at the effect of beetroot have not measured libido or other aspects of sexual health.

How could it work?

When we eat beetroot, chemical reactions involving bacteria and enzymes transform the nitrate in beetroot into nitrite, then to nitric oxide. Nitric oxide helps dilate (widen) blood vessels, potentially improving circulation.

The richest sources of dietary nitric oxide that have been tested in clinical studies are beetroot, rocket and spinach.

Nitric oxide is also thought to support testosterone in its role in controlling blood flow before and during sex in men.

Beetroot’s ability to improve blood flow can benefit the circulatory system of the heart and blood vessels. This may positively impact sexual function, theoretically in men and women.

Therefore, it is reasonable to suggest there could be a modest link between beetroot and preparedness for sex, but don’t expect it to transform your sex life.

What else could it do?

Beetroot has received increasing attention over recent years due to its antioxidant and anti-tumour effect in humans.

Clinical trials have not verified all beetroot’s active ingredients and their effects. However, beetroot may be a potentially helpful treatment for various health issues related to oxidative stress and inflammation, such as cancer and diabetes. The idea is that you can take beetroot supplements or eat extra beetroot alongside your regular medicines (rather than replace them).

There is evidence beetroot juice can help lower systolic blood pressure (the first number in your blood pressure reading) by 2.73-4.81 mmHg (millimetres of mercury, the standard unit of measuring blood pressure) in people with high blood pressure. Some researchers say this reduction is comparable to the effects seen with certain medications and dietary interventions.

Other research finds even people without high blood pressure (but at risk of it) could benefit.

Beetroot may also improve athletic performance. Some studies show small benefits for endurance athletes (who run, swim or cycle long distances). These studies looked at various forms of the food, such as beetroot juice as well as beetroot-based supplements.

How to get more beetroot in your diet

There is scientific evidence to support positive impacts of consuming beetroot in whole, juice and supplement forms. So even if you can’t get hold of tinned beetroot, there are plenty of other ways you can get more beetroot into your diet. You can try:

• raw beetroot – grate raw beetroot and add it to salads or coleslaw, or slice beetroot to use as a crunchy topping for sandwiches or wraps
• cooked beetroot – roast beetroot with olive oil, salt and pepper for a flavour packed side dish. Alternatively, steam beetroot and serve it as a standalone dish or mixed into other dishes
• beetroot juice – make fresh beetroot juice using a juicer. You can combine it with other fruits and vegetables for added flavour. You can also blend raw or cooked beetroot with water and strain to make a juice
• smoothies – add beetroot to your favourite smoothie. It pairs well with fruits such as berries, apples and oranges
• soups – use beetroot in soups for both flavour and colour. Borscht is a classic beetroot soup, but you can also experiment with other recipes
• pickled beetroot – make pickled beetroot at home, or buy it from the supermarket. This can be a tasty addition to salads or sandwiches
• beetroot hummus – blend cooked beetroot into your homemade hummus for a vibrant and nutritious dip. You can also buy beetroot hummus from the supermarket
• grilled beetroot – slice beetroot and grill it for a smoky flavour
• beetroot chips – slice raw beetroot thinly, toss the slices with olive oil and your favourite seasonings, then bake or dehydrate them to make crispy beetroot chips
• cakes and baked goods – add grated beetroot to muffins, cakes, or brownies for a moist and colourful twist.

Are there any downsides?

Compared to the large number of studies on the beneficial effects of beetroot, there is very little evidence of negative side effects.

If you eat large amounts of beetroot, your urine may turn red or purple (called beeturia). But this is generally harmless.

There have been reports in some countries of beetroot-based dietary supplements contaminated with harmful substances, yet we have not seen this reported in Australia.

What’s the take-home message?

Beetroot may give some modest boost to sex for men and women, likely by helping your circulation. But it’s unlikely to transform your sex life or act as vegetable Viagra. We know there are many contributing factors to sexual wellbeing. Diet is only one.

For individually tailored support talk to your GP or an accredited practising dietitian.

Lauren Ball, Professor of Community Health and Wellbeing, The University of Queensland and Emily Burch, Lecturer, Southern Cross University

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

Microplastics and nanoplastics are everywhere in our environment – including in our oceans and lakes, farmland, and even Arctic ice algae.

Microplastics have also been found inside of us – with studies detecting them in various tissues including in the lungs, blood, heart and placenta. Understandably, concern is rising about the potential risks of microplastics on our health.

However, while a growing body of research has focused on microplastics and nanoplastics, there’s still a lack of direct evidence that their presence in human tissues is harmful to our health – and it’s uncertain if they are related to particular diseases.

A new study has uncovered a correlation between microplastics and heart health, though. The researchers found that people who had detectable microplastics and nanoplastics in the plaque in their arteries had a higher risk of heart attack, stroke and death.

Heart health

The researchers looked at 257 people altogether. All of the patients were already undergoing preventative surgery to remove plaque from their carotid arteries (the main arteries that supply the brain with blood). This allowed the researchers to collect plaque samples and perform a chemical analysis. They then followed up with participants 34 months later.

Of the 257 participants, 150 were found to have the presence of microplastics and nanoplastics in their arterial plaque – mainly fragments of two of the most commonly used plastics in the world, polyethylene (used in grocery bags, bottles and food packaging) and polyvinyl chloride (used in flooring, cladding and pipes).

A statistical analysis of this data found that patients with microplastics and nanoplastics in their plaque had a higher risk of suffering a heart attack, stroke or death from any cause, compared with those who had no microplastics or nanoplastics in their plaque.

The researchers also analysed the macrophages (a type of immune cell that helps remove pathogens from the body) in the patients’ arteries. They found that participants who’d had microplastics and nanoplastics in their plaque also had evidence of plastic fragments in their macrophages.

They also looked at whether certain genes associated with inflammation (which can be a sign of disease) were switched on in the participants. They found that the participants who’d had microplastics and nanoplastics in their plaque also had signs of inflammation in their genes.

These results may suggest an accumulation of nanoplastics and microplastics in carotid plaque could partly trigger inflammation. This inflammation may subsequently change the way plaque behaves in the body, making it less stable and triggering it to form a blood clot – which can eventually block blood flow, leading to heart attacks and strokes.

Interestingly, the researchers also found the presence of nanoplastics and microplastics was more common in participants who had diabetes and cardiovascular disease. This raises a lot of questions which have yet to be answered – such as why microplastics were more common in these participants, and if there may be a correlation between other diseases and the presence of microplastics in the body.

Other health risks

This study only focused on patients who had carotid artery disease and were already having surgery to remove the build-up of plaque. As such, it’s unclear whether the findings of this study can be applied to a larger population of people.

However, it isn’t the first study to show a link between microplastics and nanoplastics with poor health. Research suggests some of this harm may be due to the way microplastics and nanoplastics interact with proteins in the body.

For example, some human proteins adhere to the surface of polystyrene nanoplastics, forming a layer surrounding the nanoparticle. The formation of this layer may influence the activity and transfer of nanoplastics in human organs.

Another study suggested that nanoplastics can interact with a protein called alpha-synuclein, which in mouse studies has been shown to play a crucial role in facilitating communication between nerve cells. These clumps of nanoplastics and protein may increase the risk of Parkinson’s disease.

My published PhD research in chicken embryos found that nanoplastics may cause congenital malformations due to the way they interact with a protein called cadherin6B. Based on the interactions myself and fellow researchers saw, these malformations may affect the embryo’s eyes and neural tube, as well as the heart’s development and function.

Given the fact that nanoplastics and microplastics are found in carotid plaque, we now need to investigate how these plastics got into such tissues.

In mice, it has been demonstrated that gut macrophages (a type of white blood cell) can absorb microplastics and nanoplastics into their cell membrane. Perhaps a similar mechanism is taking place in the arteries, since nanoplastics have been identified in samples of carotid plaque macrophages.

The findings from this latest study add to a growing body of evidence showing a link between plastic products and our health. It is important now for researchers to investigate the specific mechanisms by which microplastics and nanoplastics cause harm in the body.

Meiru Wang, Postdoctoral Researcher, Molecular Biology and Nanotoxicology, Leiden University

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