Maintaining a Healthy Weight

A realistic approach to weight, health and changes you can sustain

Body weight is often presented as a simple test of discipline: eat less, move more and try harder.

That explanation is incomplete and unfair.

Weight is influenced by biology, genetics, appetite regulation, sleep, stress, medicines, medical conditions, pregnancy, menopause, work, income, food availability and the environment around us. Personal choices matter, but they are only part of the picture.

Maintaining a healthy weight is not about achieving a particular appearance. It is about supporting your physical health, mobility, energy and quality of life without allowing the number on the scales to define your worth.

What is a healthy weight?

There is no single ideal weight that applies to everyone.

Body mass index, or BMI, compares weight with height. For most adults, the commonly used categories are:

• Under 18.5: underweight
• 18.5–24.9: healthy-weight range
• 25–29.9: overweight range
• 30 or above: obesity range

BMI is useful for assessing health patterns across populations and can provide a starting point for an individual assessment. But it does not distinguish muscle from body fat or show where fat is stored. It may also be less accurate for athletes, older adults, pregnant people and some cultural or ethnic groups.

Waist circumference can provide additional information because excess fat around the abdomen is more strongly associated with metabolic and cardiovascular risk.

Your GP should interpret these measurements alongside your blood pressure, blood glucose, cholesterol, medical history, fitness, function and personal circumstances.

Health matters more than one number

More than six in ten Australian adults are living with overweight or obesity. These figures reflect complex biological, social and environmental influences—not a widespread failure of willpower.

Higher weight can increase the likelihood of conditions including:

• Type 2 diabetes
• High blood pressure
• Cardiovascular disease
• Obstructive sleep apnoea
• Osteoarthritis
• Fatty liver disease
• Some cancers

However, weight alone cannot tell you how healthy someone is. People of similar size may have very different fitness, metabolic health, mobility and medical risks.

A useful goal is therefore not simply “lose as much weight as possible”. It is to improve the factors that matter: food quality, movement, strength, sleep, blood pressure, blood glucose, comfort and everyday function.

Modest weight loss can still matter

For someone living above their healthiest weight, losing around 5% of their starting weight may provide meaningful health benefits.

For a person weighing 100 kilograms, that is approximately 5 kilograms—not necessarily a return to the BMI “healthy” range.

This degree of weight loss may improve blood pressure, blood glucose, cholesterol, mobility and the risk of developing type 2 diabetes or cardiovascular disease.

Larger losses may provide additional benefit for some people, but they are not required before progress counts.

Build meals that keep you nourished

Very restrictive diets can produce rapid short-term weight loss, but they are often difficult to maintain and may contribute to hunger, fatigue, nutrient deficiencies or loss of muscle.

A practical eating pattern usually includes:

• Plenty of vegetables and some fruit
• Wholegrain or high-fibre carbohydrate foods
• Protein at meals
• Legumes, nuts and seeds
• Mostly unsaturated fats
• Water as the main drink
• Smaller amounts of energy-dense discretionary foods

Protein and strength exercise become particularly important during weight loss because the aim is to reduce excess body fat while preserving muscle.

Pay attention to portions and hunger

Healthy foods still contain energy, but counting every kilojoule is not the only way to manage intake.

You might begin by:

• Eating without frequent screen distraction
• Slowing down enough to notice fullness
• Serving food onto a plate rather than eating from a packet
• Including protein and fibre at meals
• Planning for times when you are usually very hungry
• Keeping convenient nutritious foods available
• Reducing sugary drinks and frequent alcohol

Hunger is not a character flaw. Strong appetite can be biologically driven, especially after weight loss, poor sleep or prolonged restriction.

Move for health, not punishment

Exercise can support weight maintenance, fitness, mood, sleep and cardiovascular health—even when the scales change very little.

Australia’s current movement guidance recommends moderate-to-vigorous activity for at least 30 minutes on most days, strength exercise on at least two days each week, several hours of light activity daily and regular breaks from prolonged sitting.

Sleep and stress influence weight

Insufficient sleep can make appetite harder to regulate and reduce the energy or motivation available for planning meals and exercising.

Stress may lead some people to eat for comfort, while others lose their appetite. Addressing anxiety, low mood, trauma, shift work or chronic sleep disruption may therefore be an important part of weight care.

Weight regain is common

After weight loss, the body may respond by increasing hunger and reducing energy expenditure. This helps explain why maintaining weight loss can be harder than initially losing it.

Regain does not prove that someone has failed. It may mean the plan was too restrictive, life circumstances changed, biological appetite increased or ongoing treatment is needed.

When professional treatment may help

Some people benefit from support from a GP, accredited practising dietitian, psychologist, physiotherapist or accredited exercise physiologist.

Prescription weight-management medicines may be appropriate for selected adults when health risks justify treatment. They should be combined with appropriate nutrition, activity and medical follow-up.

Bariatric or metabolic surgery may be considered for some people living with obesity, particularly when weight-related illness is significant and other approaches have not provided enough benefit.

When to speak with your GP

Seek personalised advice if you have:

• Unexplained weight gain or weight loss
• Symptoms of an eating disorder
• Diabetes, cardiovascular disease or fatty liver disease
• Loud snoring or marked daytime sleepiness
• Medicines that may affect weight
• Difficulty losing weight despite sustained changes
• Repeated cycles of restrictive dieting and regain
• Reduced mobility or joint pain
• Concerns about a child’s growth

Start with one change

Choose one action that feels realistic:

• Add vegetables to one regular meal
• Include protein at breakfast
• Replace one sugary drink with water
• Walk for ten minutes after dinner
• Complete two short strength sessions each week
• Set a regular sleep schedule
• Book a GP review to discuss your health risks and options

The bottom line

Maintaining a healthy weight is not about perfection, shame or reaching one universal number.

BMI and waist circumference can help assess risk, but they are only part of the picture. Food quality, movement, strength, sleep, metabolic health and everyday function also matter.

Even modest, sustained weight loss can improve health for people who would benefit from it. Others may need help maintaining their current weight, preserving muscle or avoiding further gain.

Choose realistic changes, seek treatment when it is appropriate and measure success by improvements in health—not only by the scales.