Eat the Rainbow: How Plant Diversity Can Support Your Health and Longevity

This National Nutrition Week, we’re exploring why eating more plants is about so much more than what’s on your plate.

When it comes to nutrition, it can feel like there’s always a new rule to follow, a food to avoid or a wellness trend to keep up with. But what if we shifted the focus from what we should eat less of to what we could be adding more of?

Think colourful vegetables, fibre-rich legumes, whole grains, nuts, seeds and fresh herbs. Not only do these foods bring colour and flavour to our meals, but they also provide a variety of nutrients that support our health, from our gut to our heart and beyond.

To celebrate National Nutrition Week, we spoke with Shayelle Lajoie, Bachelor of Biomedical Science and is currently studying a Master’s in Dietetics and Sport Nutrition, about the benefits of plant-forward eating, why variety matters and how we can build habits that support our health for the long term.

1. Why eating more plants can make a difference

Plant-based eating has become a popular topic in the wellness world, but its benefits go beyond a passing trend.

Plants provide fibre, water, vitamins, minerals and a range of beneficial compounds that help support our overall health. Fibre and water also contribute to feelings of fullness, helping us feel satisfied after a meal.

Shayelle highlights another important benefit: choosing more plant-based protein sources can help increase fibre intake while reducing saturated fat, particularly when foods like legumes, lentils and tofu replace some higher-saturated-fat animal protein sources.

Eating a greater variety of plant foods has also been associated with better long-term health outcomes. Rather than focusing on one particular superfood, the bigger picture is about building a balanced, varied diet that gives your body a broad range of nutrients.

2. Eat the rainbow - your gut will thank you

There’s a reason we’re often encouraged to eat a variety of colourful plant foods. Different plants contain different combinations of fibre and naturally occurring compounds, helping us nourish our bodies in a variety of ways.

Our gut microbiome - the community of microorganisms living in our digestive system - is one of the reasons this diversity matters.

Many of our gut microbes rely on dietary fibre and other indigestible plant compounds for fuel. As they break these down, they produce beneficial substances, including short-chain fatty acids and other metabolites that help support gut and overall health.

Some of these beneficial substances are known as postbiotics. In simple terms, they’re products of microbial activity that can have positive effects on our health.

The takeaway? Variety matters. Eating a wider range of plant foods helps provide different types of fuel for our gut microbes, supporting a diverse and thriving gut ecosystem.

So, instead of relying on the same few vegetables every week, try mixing things up. Add leafy greens to your lunch, swap between different legumes, sprinkle seeds over breakfast or experiment with a new vegetable at dinner.

Every colour brings something different to the table.

3. Fibre: the everyday essential we shouldn't overlook

Fibre might be having its moment, but it's far from a passing wellness trend. It's an essential part of a balanced diet, supporting digestive health and playing a role in several important processes throughout the body.

Fibre helps keep our digestive system moving, supports a healthy gut microbiome and can help regulate cholesterol levels. Certain types of fibre also support healthy blood glucose levels and help us feel fuller for longer.

Shayelle also highlights the importance of fibre for our broader health, including the gut's relationship with immune function, hormones and mood. For example, some dietary fibres help support the production of gut-derived compounds involved in immune function, while regular bowel movements help the body eliminate waste products.

Yet many Australians still fall short of recommended fruit and vegetable intakes, making fibre-rich foods a valuable place to start when looking to improve everyday nutrition.

So, how can you get more?

• Add lentils, chickpeas or beans to curries, soups, salads and pasta sauces.
• Choose whole grains such as oats, brown rice and wholegrain bread more often.
• Snack on fruit, or add berries to your breakfast.
• Sprinkle chia seeds, pepitas or nuts over meals.
• Include a variety of vegetables across lunch and dinner.

One important tip: if you're increasing your fibre intake, do it gradually and drink enough water. If legumes tend to leave you feeling bloated, start with smaller portions and build up as your body adjusts.

Fibre is not about doing everything perfectly. It's about finding small, consistent ways to include more of it in your day.

4. Eating for longevity: think patterns, not superfoods

When we talk about longevity, it's easy to look for a single ingredient or supplement that promises to do it all. But supporting long-term health is much more about the overall pattern of how we eat and live.

Diets rich in vegetables, fruit, legumes, whole grains, nuts and seeds are associated with a range of positive health outcomes. These foods provide fibre and a broad range of nutrients, while eating more plant foods in place of some processed meats and other less nutritious options can help support a balanced dietary pattern.

For Shayelle, eating for longevity is about making these foods part of everyday life.

Her breakfast might include oats topped with chia seeds, raspberries, walnuts and pepitas. Lunch could be a Buddha bowl with sauerkraut, while dinner might feature warming dahl topped with cruciferous vegetables and fresh herbs. Homemade broccoli sprouts earn extra points, too.

It's a great reminder that nourishing meals don't need to be complicated. A few thoughtful additions can bring more colour, texture and variety to the plate.

Shayelle also emphasises the importance of meeting your protein needs throughout the day, fuelling movement with carbohydrates and including sources of healthy fats at meals. For active people, getting enough energy and nutrients to support exercise and recovery is an important part of the bigger picture.

Ultimately, longevity isn't about eating one perfect meal. It's about the habits we can maintain over time.

5. Add more good things, rather than focusing on what to cut out

With so much nutrition advice circulating online, it can be difficult to know what to trust. One week, a food is celebrated as a superfood; the next, it's labelled something to avoid.

Shayelle's advice? Be cautious of bold, absolute claims, particularly when they're being used to sell a product or promise a quick fix.

Instead of ruling out entire food groups without a clear reason, she encourages finding simple ways to add more plants to meals you're already enjoying.

Love your usual bolognese? Try adding lentils to the sauce. Making a curry? Stir in chickpeas or extra vegetables. Having toast for breakfast? Add some avocado, tomato or leafy greens.

And if you're trying to eat more legumes but experience bloating, there's no need to force a dramatic change overnight. Start with small portions and increase them gradually.

A more nourishing approach doesn't have to mean a complete overhaul. It's about building on what you already enjoy and making room for more variety, one meal at a time.

6. Your starting point: change just one meal

If you're ready to eat a little more plant-forward, Shayelle recommends starting small.

Rather than changing your entire diet, choose one meal and experiment with a simple swap.

• At dinner: Perhaps replace the meat in your usual meal with lentils, or try a combination of lentils and your usual protein.
• At breakfast: Add berries, nuts and seeds to your morning oats, or give scrambled tofu a go in place of eggs.
• At lunch: Build a bowl around colourful vegetables, whole grains and legumes, then finish with fresh herbs or seeds.

The goal isn't to follow a rigid set of rules. It's to find realistic changes that fit your routine, taste good and are easy to repeat.

Over time, these small additions can help you build a more varied, plant-rich way of eating without making food feel complicated.

A little more colour goes a long way

This National Nutrition Week, consider it your reminder that healthy eating doesn't have to be about restriction, perfection or keeping up with every new wellness trend.

Start with what you can add: another vegetable, a handful of nuts, a spoonful of seeds or a new legume in a familiar recipe.

Because when it comes to supporting your health, it's not just about what's on your plate today. It's about the variety of nourishing foods you make room for over time.

More colour. More variety. More plants. One meal at a time.

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