nutrition · 2025 · 4 min read

What a healthy diet actually looks like

Maintaining a healthy diet is one of the simplest things you can do for your overall wellbeing, and one of the easiest to overthink. The good news is that the science here is fairly settled. You do not need a special plan or an expensive powder. You need a reasonable balance of ordinary food, most of the time.

The advice below follows the Australian Dietary Guidelines, which are the national, evidence-based recommendations for eating well.

So what actually counts as a healthy diet?

A healthy diet is a balance of foods from five food groups, eaten in sensible amounts, with the heavily processed stuff kept to the edges. That is really the whole idea. Get most of your energy from vegetables, fruit, wholegrains, lean proteins and dairy (or alternatives), limit foods high in added sugar, salt and unhealthy fats, drink mostly water, and watch your portions. Do that consistently and you are supporting good health and helping to prevent a lot of common disease down the track.

Notice what is not on that list: no single food is magic, and no single food is poison. It is the overall pattern that matters.

What are the five food groups, and how much of each?

Here is roughly how a day breaks down. These are serves per day for a typical adult. Your exact numbers shift a bit with your age, size, sex and how active you are, so treat these as a guide rather than a rule.

• Vegetables and legumes: 5 or more serves a day. This is the biggest group for a reason. Aim for a range of colours across the week.
• Grains and cereals: 4 to 6 serves a day, choosing wholegrain and high-fibre varieties where you can (wholemeal bread, oats, brown rice, wholegrain pasta).
• Fruit: 2 serves a day.
• Lean meats and alternatives: 2.5 to 3 serves a day. This includes lean meat, poultry, fish, eggs, tofu, nuts, seeds and legumes.
• Dairy and alternatives: 2.5 to 4 serves a day of milk, yoghurt, cheese or their alternatives, ideally the reduced-fat versions for most adults.

What does that mean, really? A sample day

Serves and food groups are useful, but they can feel abstract. So here is a full day of eating that hits the targets above, sized for an 80kg man who is reasonably active. Scale the portions up or down to suit you.

Breakfast

Rolled oats made with reduced-fat milk, topped with a handful of berries and a few nuts. A glass of water.

Morning snack

A piece of fruit (an apple or a banana) and a tub of natural yoghurt.

Lunch

A wholegrain wrap or sandwich with lean chicken or tinned tuna, plus a generous pile of salad vegetables. A side of cherry tomatoes or carrot sticks if you are still hungry.

Afternoon snack

A small handful of unsalted nuts, or vegetable sticks with hummus.

Dinner

Grilled fish or lean meat with brown rice or wholegrain pasta, and half the plate filled with vegetables. Water to drink.

That is not a restrictive day. It is a satisfying one. The trick is that vegetables and wholegrains are showing up at nearly every meal, and the protein is lean.

What about hydration?

Water is the best default drink, and most of the time it is all you need. As a rough guide, aim for around 2 to 3 litres of fluid a day, more if it is hot or you have been exercising or unwell. Your urine colour is a handy check: pale straw is about right, and darker means you probably need to drink more.

Sugary drinks, including juice, add up fast and are worth keeping as occasional rather than everyday choices.

And the extras?

Biscuits, chips, takeaway, soft drink, alcohol and the like are what the guidelines call "discretionary" foods. They are fine in small amounts. The point is not to ban them, it is to keep them as the extras rather than the foundation. If most of your week looks like the sample day above, the occasional treat is not going to undo any of it.

If you have a specific health condition, are pregnant, or are trying to lose or gain weight, the general advice here may need tailoring. That is exactly the kind of thing worth a chat with your own GP or a dietitian.

Source: Australian Dietary Guidelines (eatforhealth.gov.au).

Dr Ahmed Al-Obaidi · FRACGP

General information only, not personal medical advice. Talk to your own GP about what suits you.