Finding the best diet to lose weight in Australia means choosing an evidence-based eating pattern that fits your lifestyle and food preferences while meeting your nutritional needs. A balanced diet is recommended by national health authorities in Australia as the foundation for healthy weight loss. The most effective approach focuses on sustainable, gradual changes rather than quick fixes, with medical professionals recommending a daily energy reduction of at least 2000 kilojoules compared to your usual intake.​

What Is the Best Diet for Weight Loss in Australia?

There is no ‘one-size-fits-all’ dietary approach when it comes to the best diet to lose weight in Australia. The best diets are those that fit your individual factors, such as your current weight, health status, food preferences, and lifestyle. However, all evidence-based weight loss diets share common principles: they create an energy deficit whilst ensuring you consume enough nutritious foods from the five core food groups. Structured meal plans can help you adhere to these principles by providing clear guidance on energy intake and food choices within different diet categories.​

The Australian Dietary Guidelines provide the foundation for safe, sustainable weight loss. These guidelines recommend eating a wide variety of vegetables and legumes, fruits, wholegrains, lean meats and alternatives, and reduced-fat dairy or alternatives, whilst limiting discretionary foods high in saturated fat, added sugars and salt.​

The best diet to lose weight in Australia is ultimately one you can maintain long-term. A personalised diet plan should focus on your wellbeing and include small, gradual changes that are sustainable rather than dramatic restrictions that lead to the cycle of weight loss and regain. Choosing a diet that appeals to your tastes and preferences is crucial for long-term adherence and success in weight loss.​

Core Principles of Effective Weight Loss Diets

Successful weight loss diets in Australia target a reduction in total energy intake whilst meeting your nutritional requirements. To lose weight healthily, you should eat enough nutritious foods and drinks to meet your energy needs whilst reducing your daily energy intake by at least 2000 kilojoules compared to what you usually eat when weight stable.​

All evidence-based diets emphasise eating a wide variety of foods from the five core food groups: vegetables and legumes, fruit, whole grains, lean meats and alternatives, and reduced-fat dairy or alternatives. These foods provide essential nutrients without excessive kilojoules, supporting a balanced diet. Making half your meals coloured vegetables or salad, for example, can reduce kilojoule intake by up to half whilst keeping you feeling fuller.​

Limiting discretionary foods and drinks is crucial for weight loss success. This means reducing your intake of foods high in saturated fat, added sugar, salt and alcohol, and avoiding foods with high added sugar or high glycemic index (GI) to support weight loss. Drinking plenty of water throughout the day is also a key component of a healthy eating plan for weight loss.​

Self-monitoring is one of the most important predictors of weight loss success. Tracking your dietary intake and physical activity significantly increases the likelihood of losing weight and keeping it off. Whether you use a smartphone app, journal or food diary, consistent self-monitoring helps you stay accountable and identify patterns in your eating behaviour.​

Making small and gradual changes to your diet is important for sustainable weight loss.

Top Evidence-Based Diets for Australians

CSIRO Total Wellbeing Diet

The CSIRO Total Wellbeing Diet is Australia’s leading scientifically validated weight loss programme, developed by the Commonwealth Scientific and Industrial Research Organisation. This high-protein, low-GI diet has shown impressive results, with participants able to achieve an average weight loss of 5 to 7% of their body weight in the first 12 weeks.​

The programme is built on over 10 years of evidence-based research and focuses on meal plans designed to keep you feeling fuller for longer whilst controlling cravings. The CSIRO Total Wellbeing Diet offers flexible options including Protein Balance plans for standard weight loss, Foodies plans for those who enjoy cooking, and Fast Start plans that incorporate meal replacements specifically designed to kick start your weight loss journey.​

Research shows that 98% of members lose weight on the programme, with “super star” members losing an average of 21% of their body weight. The diet emphasises realistic, affordable and enjoyable healthy eating rather than quick fixes, making it sustainable for long-term results.​

Mediterranean Diet

The Mediterranean diet is renowned for its association with longevity and a significantly reduced risk of developing lifestyle diseases such as heart disease, type 2 diabetes and certain cancers. This eating pattern emphasises plant-based foods including vegetables, fruits, legumes, wholegrains, nuts and seeds, with extra-virgin olive oil as the primary source of fat.​

The Mediterranean diet includes moderate amounts of fish, seafood and fermented dairy products like cheese and yoghurt, whilst limiting red meat, processed foods and sweets. A typical Mediterranean breakfast as part of a balanced diet might include eggs and Greek yoghurt, both of which are healthy, protein-rich options that support weight management. Australian adaptations of the Mediterranean diet have shown excellent adherence rates, with 78% of participants in the AUSMED study maintaining high adherence at 12 months compared to just 11% at baseline.​

The diet’s flexibility makes it particularly suitable for the Australian lifestyle and coastal culture. It adapts easily to seasonal produce available at Australian markets and accommodates social eating situations like barbecues and restaurant meals. The Mediterranean diet can be followed with or without intermittent fasting, as it naturally keeps you satiated and energised, and can give you more energy throughout the day.​

Plant-Based Diets

Plant-based diets include a wide variety of whole grains, nuts, seeds, fruits, vegetables and legumes as their foundation. These diets emphasize specific foods such as legumes, whole grains, and vegetables for optimal nutrition, making them a popular choice for those seeking the best diet to lose weight in Australia. These diets are naturally high in fibre, which promotes feelings of fullness whilst delivering essential nutrients and supporting digestive health.​

Plant-based eating patterns can range from flexitarian approaches that include small amounts of animal products to fully vegetarian or vegan diets. Research consistently shows that dietary patterns featuring plant-based diets and higher consumption of wholefoods such as wholegrains, legumes, fruit and vegetables are associated with better weight management and reduced chronic disease risk.​

The high fibre content in plant-based diets helps with appetite control and steady energy release throughout the day. Foods like oats, quinoa, legumes and berries provide slow-digesting carbohydrates that prevent cravings and support sustainable weight loss.​

Calorie Control Diets

Calorie control diets aim to keep daily calorie intake between 1200 to 1400 calories (approximately 5000 to 5850 kilojoules) for weight loss. This approach requires measuring portion sizes and tracking your food intake to ensure you stay within your target range whilst meeting nutritional needs.​

Structured calorie counting works particularly well for people who prefer clear numerical targets and enjoy the accountability of tracking. Many Australians using this approach find success by focusing on palm-sized portions of protein (approximately 300 calories each) accompanied by two generous handfuls of vegetables or fruit at each meal.​

The key to success with calorie control is choosing nutrient-dense foods that provide maximum nutrition for the kilojoules consumed. This means prioritising the five core food groups whilst limiting discretionary foods that provide kilojoules without essential nutrients.​

However, it’s important to note that drastic calorie reductions, such as very low-calorie diets, can negatively affect your metabolic rate, making long-term weight management more difficult.

Intermittent Fasting

Intermittent fasting, also known as a fasting diet, involves alternating periods of normal eating with periods of calorie restriction or complete fasting. The most popular fasting diets in Australia include the 5:2 diet, where you eat normally for five days and restrict calories to around 800 on two non-consecutive days, and the 16:8 method, where you fast for 16 hours and eat within an eight-hour window. Fasting diets encourage followers to reduce calorie intake on certain days or within specific time frames. Intermittent fasting, such as the 5:2 diet, involves periods of normal eating alternating with days of calorie restriction, typically around 800 calories.

Intermittent fasting can lead to weight loss primarily because it helps reduce your overall kilojoule intake. The simplest version, 16:8, can mean having your last meal at 7pm and not eating again until 7am the next morning, effectively extending your overnight fast.​

Choosing a diet that appeals to your tastes and preferences is crucial for long-term adherence and success in weight loss. Intermittent fasting may not suit everyone, particularly shift workers, people with certain medical conditions, or those who experience significant hunger or low energy during fasting periods. It’s important to ensure you’re still meeting your nutritional needs during eating windows.​

When Medical Supervision Is Required

Very Low-Energy Diets (VLEDs)

Very low-energy diets (VLEDs) are intensive weight loss programmes that limit total energy intake to only 1800 to 2500 kilojoules per day. These programmes require medical supervision due to their restrictive nature and potential impacts on health markers and medications. VLEDs are often prescribed for health reasons, such as preparing for surgery or managing medical conditions.​

In Australia, VLEDs are often used as a 12-week “kickstart” under medical supervision, typically replacing all three meals with specialised meal replacement products. The OPTIFAST programme is one example, where the intensive level is followed by a gradual reintroduction of regular food through subsequent programme levels. VLEDs are designed to help individuals achieve rapid weight loss goals, especially when quick results are needed for specific health outcomes.​

VLEDs require regular monitoring by doctors, nurses or dietitians, with higher-risk patients needing more frequent check-ups. This includes people with a BMI over 35, those with high cardiovascular disease risk, people with diabetes, individuals over 65 years, and anyone on prescribed medications. Medications for blood pressure, blood sugar management, anticoagulation, and other conditions need regular review when following a VLED.​

Who Should You Consult Before Starting?

Consultation with a doctor or an Accredited Practising Dietitian is recommended before starting any new weight loss diet to ensure safety and suitability for your individual health needs. This is particularly important for people with diabetes, heart disease, kidney disease or other chronic conditions, as dietary changes can significantly impact these conditions and may require medication adjustments.​

Individuals taking medications for blood pressure, blood sugar control or blood thinning should always consult their GP before making significant dietary changes. People over 65 years, those with a BMI over 35, and anyone with a history of disordered eating should also seek professional guidance before starting a weight loss diet.​

Why Fad Diets Fail (and How to Spot Them)

Fad diets often promise quick weight loss but are usually nutritionally inadequate and difficult to maintain long-term. New diets frequently emerge, often promoted as quick fixes, but they rarely deliver sustainable results. Thxese diets are based on little scientific evidence and frequently make unrealistic claims about rapid results or “secret” methods that celebrities supposedly use.​

The most radical fad diets often cut out entire food groups or focus on restricting or promoting specific foods, which can lead to nutritional deficiencies and imbalances. Eliminating key food groups without careful planning raises the risk of missing essential vitamins, minerals and other nutrients your body needs. Less than 7% of Australian adults currently meet the recommended five serves of vegetables per day, so further restricting food variety can worsen nutritional intake.​

Many fad diets lead to initial weight loss but are difficult to maintain long-term, resulting in a cycle of weight loss and regain. Research shows that the majority of people who follow fad diets regain the weight within a year. This weight cycling can be more harmful to your health than maintaining a stable weight. Restrictive diets that lack essential nutrients may also increase the risk of developing serious conditions like cancer and heart disease over time.​

Fad diets are often promoted through social media by influencers and celebrities, which can mislead the public about their safety and effectiveness. Unlike evidence-based dietary advice from health professionals, these promotions rarely include appropriate warnings about potential risks or consideration of individual health needs.​

Fad diets can be especially dangerous for individuals with specific health problems such as diabetes or heart disease. The more radical the diet approach, the more likely individuals are to give up due to boredom, unpleasant side effects, or the diet’s incompatibility with normal life. Crash or fad diets can also create an unhealthy relationship with food, potentially leading to disordered eating patterns.​

The Role of Accredited Practising Dietitians

A dietitian can provide personalised, easy-to-follow and evidence-based advice tailored to your individual needs. Accredited Practising Dietitians (APDs) in Australia are university-qualified health professionals regulated by Dietitians Australia who specialise in food and nutrition.​

When it comes to losing weight, there is no “one-size-fits-all” dietary approach, and an APD can help identify the most suitable eating pattern for your circumstances. They take into account your current health status, medications, food preferences, cultural background, budget and lifestyle factors to create a realistic plan you can actually maintain.​

APDs provide accountability and practical strategies for overcoming common barriers to weight loss. They can help you navigate Australian food environments, from supermarket shopping to cafe culture, and adjust your plan based on your progress and feedback. Many Australians find that professional support significantly improves their success with long-term weight management.​

Services from Accredited Practising Dietitians are often covered by private health insurance or may be accessed through Medicare with a GP referral under Chronic Disease Management plans, making professional support more affordable than many people realise.​

Practical Tips for Long-Term Success

The most effective weight loss plan is one that adheres to sustainable healthy lifestyle changes over temporary fixes. Making small and gradual changes to your diet is important for sustainable weight loss rather than attempting dramatic overhauls that prove impossible to maintain. Choosing a healthy way to lose weight—focusing on balanced eating and long-term habits—will help you achieve and maintain your goals.

Choosing a diet that appeals to your tastes and preferences is crucial for long-term adherence. The best diet for weight loss is one that you can stick to over the long term, not the one that promises the fastest results. Consider how any dietary approach fits with your real life, including work schedules, family meals, social occasions and Australian cultural eating patterns.​

Self-monitoring your dietary intake and physical activity can enhance weight loss success significantly. Whether using smartphone apps, written journals or regular weight tracking, consistent monitoring increases awareness and helps identify patterns that support or hinder your progress.​

A healthy weight loss diet should focus on balanced eating and physical activity together. Staying active is essential—physical activity complements dietary changes by increasing energy expenditure, preserving muscle mass during weight loss, and providing mental health benefits that support long-term adherence.​

Drinking plenty of water is a key component of a healthy eating plan for weight loss. Staying well-hydrated supports metabolism, helps distinguish between hunger and thirst, and can reduce calorie intake when water replaces sugary drinks. Limiting intake of alcohol, saturated fat, added sugar and salt is recommended for healthy weight loss across all evidence-based dietary approaches. Healthy habits like these can also give you more energy throughout the day.

Frequently Asked Questions

Ready to start your weight loss journey with professional support?

Consultation with an Accredited Practising Dietitian provides personalised, evidence-based guidance tailored to your health needs, preferences and lifestyle. You might also consider seeking support from a weight loss clinic Sydney, such as Narellan Medical +Skin, which offers GP-led, personalised weight loss programs.