The astonishing benefits of seeds revealed: The cheap foods that lower cholesterol, boost hair growth and transform your health

Sprinkled on top of yogurt and salads or blended into smoothies, seeds are small but nutritionally mighty – yet they often don’t get the credit they deserve, experts claim.

Few would argue with the well-known health benefits of nuts, with the majority of us finding one way or another to incorporate them into our daily diets – whether that’s spread on toast as a convenient on-the-go breakfast or packed into protein bars.

But seeds are often overlooked, says registered nutritionist Helen Johnston. And that is a mistake.

‘Everyone should be eating seeds – and treating them like you would a supplement,’ she says.

So what do we know about these nutritional powerhouses? First off, seeds are a great source of fibre helping to aid digestion and make us feel fuller for longer.

They also contain healthy fats, essential amino acids our bodies can’t make on their own and powerful antioxidants that can ward off the visible signs of aging whilst protecting our hearts.

So which seeds are best, and for what? From flax to pumpkin to hemp and chia, Ms Johnston breaks down the health benefits of each…

Flax seeds to lower your sky-high cholesterol

Besides being good for the gut, regularly eating flaxseeds – especially in their milled form – has been shown to reduce total and so-called bad cholesterol levels, decrease blood pressure and improve blood sugar control.

‘Flax seeds are absolutely incredible for not only your gut but also your heart and overall health,’ Johnston explains.

Most of these perks stem from the seeds’ high fibre content and lignans, which act not only to reduce levels of harmful cholesterol but also as phytoestrogens, helping to support metabolic health.

One 2021 clinical trial found that people with high blood pressure who ate around four tablespoons of flax seeds a day experienced significant reductions in body mass index (BMI), total cholesterol levels and blood pressure.

‘Phytoestrogens mimic oestrogen in the body and dock onto oestrogen receptors to help modulate oestrogen dominance, which has been linked to breast cancer,’ Johnston explained.

But they can also work the other way, helping to boost oestrogen when levels are low, potentially reducing the risk of osteoporosis while improving skin elasticity.

Chia seeds for healthy ageing, glowing skin and gut health

Packed full of omega-3 fatty acids, chia seeds have made a name for themselves in the wellness world – and for good reason, Johnston says.

Small but nutritionally mighty, chia seeds are a source of healthy fats, protein and fibre, and can be easily incorporated into your diet.

‘Chia seeds are a complete protein, meaning they contain all nine essential amino acids that the body can’t make on its own – which is very rare in the plant world,’ she explains.

‘They also provide important micronutrients such as calcium, magnesium and iron – all of which play an important role in bone health.

‘Chia seeds are also packed full of antioxidants, including compounds such as caffeic acid and kaempferol, which have powerful anti-ageing properties,’ she said.

A 2020 study published in the journal Amino Acids suggested these compounds may contribute to improved skin health by protecting against enzymes linked to the appearance of fine lines and wrinkles.

While chia seeds can be enjoyed in many different forms, the nutritionist agrees soaking them and consuming them as a chia pudding for breakfast is one of the best ways to reap their benefits.

‘Soaking them for just 10 minutes or overnight will turn them into a gel, making them easier to digest, supporting better bowel movements and aiding overall gut health,’ Johnston said.

Sunflower seeds for heart health, vitamin E and disease protection

Brazil nuts may be one of the most well-known sources of selenium, a powerful antioxidant that has been shown to reduce inflammation and protect against cellular damage.

But sunflower seeds are also a great – and often overlooked – source of essential minerals, Johnston says, providing more than 40 per cent of our daily recommended intake in just one serving.

Sunflower seeds are also a great source of antioxidant vitamin E, which plays a key role in protecting cells – boosting skin health while strengthening the body’s natural defences against disease.

Studies have also shown that getting enough vitamin E – around 4mg a day for men and 3mg for women, roughly the equivalent of a tablespoon of sunflower seeds – may help reduce the risk of heart disease.

Pumpkin seeds for hair growth, immunity and hormone balance

Pumpkin seeds are among nature’s most concentrated sources of minerals, particularly zinc, magnesium and selenium – all key players in immunity, gut health and hormone balance.

‘Since our bodies cannot produce zinc, we have to get it from food,’ Johnston explains, ‘and pumpkin seeds are one of the richest plant sources.’

Zinc is absorbed by the small intestine and then transported around the body via the bloodstream. One of its most important roles is supporting the immune system and helping fight off infection.

This is particularly important for older people or those with weakened immunity, with studies showing it can reduce the number of infections.

Eating pumpkin seeds can also help support hair health, the nutritionist adds, with one of the most notable symptoms of a zinc deficiency being hair loss.

While organic foods are often preferred, Johnston says seeds are not part of the ‘dirty dozen’, so variety is more important than choosing organic.

Poppy seeds for better sleep, strong bones and nerve health

With good levels of fibre for gut health and bone-friendly potassium, poppy seeds offer a range of nutritional benefits.

‘Poppy seeds are a great source of calcium for people who don’t eat a lot of animal products, which isn’t only great for bone health but also for nerve signalling,’ Johnston said.

But perhaps one of their lesser-known benefits is their sleep-supporting effect. A three-tablespoon serving contains over a third of an adult’s daily magnesium, which helps calm the nervous system and regulate circadian rhythms – playing a crucial role in sleep–wake cycles.

Hemp seeds for protein, brain function and energy levels

If you’re looking to boost your intake of plant protein, hemp seeds are hard to beat, containing around 5.5g of protein per tablespoon, Johnston says.

‘Hemp seeds are a real champion that is underutilised,’ she said.

‘They are one of the rare sources of complete plant protein and, as such, can help support energy levels and mental performance.’

A tablespoon sprinkled on toast is an easy way to help meet daily protein needs.

Results of a 2018 review found that the seeds may also have a neuroprotective effect, potentially helping delay the progression of Alzheimer’s and Parkinson’s disease.

Camelina seeds for omega-3 balance, cholesterol and metabolic health

You might have a bottle of camelina oil tucked away at the back of your cupboard after avoiding seed oils amid social media claims they are toxic.

Much of the criticism of seed oils focuses on their high omega-6 fatty acid content but, according to Johnston, it’s more about the balance of essential fatty acids, with many people not consuming enough omega-3s alongside them.

‘Camelina seeds are a really nutrient-dense option, rich in omega-3s, fibre, vitamin E and magnesium, supporting gut health, immunity and overall vitality,’ Johnston says.

‘We should be shouting about them as they are unique for their ideal omega-3 to omega-6 ratio, offering benefits for gut balance and cellular health.’

Studies have found that omega-6 fats can help lower harmful LDL cholesterol and improve blood sugar control by increasing insulin sensitivity.

The American Heart Association has also stated: ‘Omega-6 fats are not only safe but they are also beneficial for the heart and circulation.’

‘Seed cycling’ for hormones, PMS and menopause symptoms: does it work? 

Could a tablespoon of seeds a day really help regulate hormones and ease symptoms such as period pain and infertility?

It’s a popular idea on social media – and Johnston says there is some evidence behind it.

‘Seed cycling is a simple but powerful nutritional strategy that uses specific seeds at different phases of the menstrual cycle to support the body’s natural hormone balance,’ she explains.

Typically, flax and pumpkin seeds are recommended in the first half of the cycle to support oestrogen metabolism, followed by sunflower and sesame seeds in the second half to help balance progesterone.

‘In practice, I’ve seen this approach help many women with symptoms linked to hormonal imbalance, including PMS, irregular periods and the mood and energy fluctuations that often accompany perimenopause,’ Johnston said.

‘Combined with a nutrient-dense diet, it can be a gentle, food-first way to support hormonal balance.’