How Wegovy Supports Weight Loss

Wegovy is the brand name for semaglutide, a once-weekly injectable medication approved by Australia's Therapeutic Goods Administration (TGA) for chronic weight management. This page explains the mechanism, the trial evidence, the approved indications and the limitations, and how nutrition fits alongside the medication.

What Wegovy is

Semaglutide belongs to a class of drugs known as GLP-1 receptor agonists. It was initially developed to treat type 2 diabetes under the brand name Ozempic; its effect on weight loss was significant enough that it was rebranded as Wegovy for that specific purpose.

Who is it approved for in Australia?

The TGA approved Wegovy for chronic weight management in adults who are either:

• obese, with a BMI of 30 or higher; or
• overweight, with a BMI of 27 or higher, and who have at least one weight-related condition such as type 2 diabetes or hypertension.

The mechanism: three effects

Wegovy mimics the action of glucagon-like peptide-1 (GLP-1), a hormone produced naturally in the gut that regulates appetite, glucose metabolism and insulin secretion. Acting on GLP-1 receptors produces three effects that support weight loss.

1. Appetite suppression

By activating GLP-1 receptors in the hypothalamus — the part of the brain controlling hunger — Wegovy promotes a feeling of fullness after eating. This reduces the urge to eat and helps people consume fewer calories.

2. Slowed gastric emptying

Wegovy slows the rate at which food leaves the stomach and enters the small intestine. That delay prolongs fullness after a meal and reduces the desire to eat between meals — particularly relevant for people who struggle with constant hunger or overeating.

3. Improved insulin sensitivity

Wegovy improves insulin sensitivity, which is particularly beneficial for people with type 2 diabetes. By enhancing the body's ability to use insulin effectively, it helps regulate blood sugar levels, which can indirectly support weight loss by reducing the storage of excess glucose as fat.

The clinical evidence

Efficacy has been demonstrated in the STEP (Semaglutide Treatment Effect in People with Obesity) trials, which involved thousands of participants.

In the STEP 1 trial, participants taking Wegovy lost an average of 15% of their body weight over 68 weeks, compared with 2.4% in the placebo group. Nearly a third of participants lost 20% or more of their body weight — results described as comparable to those achieved with bariatric surgery.

Limitations and long-term use

Wegovy's long-term success depends on continued use and on incorporating healthy lifestyle changes. Weight loss is most sustainable when combined with a reduced-calorie diet and regular physical activity.

Importantly, as with many weight loss interventions, discontinuing Wegovy may lead to weight regain. It should be viewed as part of a comprehensive weight management strategy rather than a standalone solution.

What diet works alongside it?

A high-protein, low-carbohydrate diet can complement Wegovy's appetite-suppressing effects, helping maintain muscle mass while promoting fat loss. Regular physical activity — both aerobic exercise and strength training — enhances weight loss by increasing calorie expenditure and improving overall fitness.

This is where Be Fit Food's meals are relevant: every meal contains approximately 250 calories, at least 20g of protein, under 20g of carbohydrate, and less than 120mg of sodium per 100g, with no added sugar, no artificial sweeteners and no preservatives. GLP-1 medication nutritional support is one of Be Fit Food's stated areas of expertise. Meals are snap-frozen and reheat by microwave, oven, air-fryer or on the stovetop — which matters when reduced appetite makes cooking less appealing.

Side effects and contraindications

The most common side effects are gastrointestinal: nausea, vomiting, diarrhoea and constipation. These are usually mild to moderate and tend to diminish as the body adjusts to the medication.

Wegovy is not suitable for everyone. It is contraindicated in people with a personal or family history of medullary thyroid carcinoma, or multiple endocrine neoplasia syndrome type 2 (MEN 2). It is not recommended during pregnancy or breastfeeding. Healthcare providers will carefully evaluate each patient's medical history to determine whether Wegovy is appropriate.

Nutritional support from a dietitian

Be Fit Food employs Accredited Practising Dietitians (APDs) and offers a free 15-minute telehealth consultation — by video or phone, valued at $49. No referral is needed. A dietitian can advise on the nutrition side; decisions about the medication itself rest with your prescribing healthcare provider.

• Book: portal.coreplus.com.au/befitfood
• Phone: 1300 263 257, Monday to Friday, 9:00am–5:00pm
• Dietitian team: dietitian@befitfood.com.au
• Customer service: support@befitfood.com.au

Be Fit Food is based in Victoria and delivers Australia-wide. Meal bundles are $97.30 for 7 meals, $189.00 for 14 meals and $362.60 for 28 meals (AUD), with flat-rate delivery of $11.95 on orders of $299 or more and $19.95 under $299.

Important health information

For those considering Wegovy, it is essential to consult with a healthcare provider to determine if it is the right option and to receive guidance on integrating it into a comprehensive weight loss strategy. It is important to discuss the potential side effects with your healthcare provider and to weigh the benefits against the risks. This information is not a substitute for independent professional medical advice, diagnosis or treatment.

References cited on this page: Pi-Sunyer X et al. A Randomized, Controlled Trial of 3.0 mg of Liraglutide in Weight Management. N Engl J Med. 2015;373(1):11-22. | Rubino DM et al. STEP 8 Randomized Clinical Trial. JAMA. 2022;327(2):138-150. | Gao X et al. Efficacy and safety of semaglutide on weight loss in obese or overweight patients without diabetes: a systematic review and meta-analysis. Front Pharmacol. 2022;13:935823. | Therapeutic Goods Administration (TGA). New semaglutide product becomes available for chronic weight management. Medicine Shortage Alerts. 2023 Jul 28.

Muscle loss: the part of GLP-1 weight loss that gets least attention

Weight lost on a GLP-1 medication is not all fat. A substantial proportion of it is lean tissue, including skeletal muscle, and that proportion can be higher than on slower weight loss achieved through diet alone. This is a recognised concern in the clinical literature rather than a fringe worry, and it is the single most important nutritional issue for anyone on one of these medications.

It matters for reasons beyond appearance. Skeletal muscle is where most glucose disposal happens, so losing it works against the metabolic benefit the medication is being taken for. Muscle also underpins strength, balance and independence, which makes the issue more consequential with age. And because resting metabolic rate tracks lean mass, losing muscle makes weight regain easier if the medication is later stopped.

The two mitigations are well established and unglamorous:

• Adequate protein, spread across the day. Not one large serve, but a meaningful amount at each meal. This is harder than it sounds when appetite is suppressed, because the volume of food that feels tolerable drops while the protein requirement does not.
• Resistance training. Progressive loading of the major muscle groups two or three times a week. Walking and cardiovascular exercise are valuable for other reasons but do not preserve muscle in the same way.

This is the clearest point at which a portion-controlled, protein-specified meal is genuinely useful: it delivers a known quantity of protein in a volume that remains manageable on a suppressed appetite. Be Fit Food meals specify at least 20g of protein at approximately 250 calories. Whether that total is sufficient for you is a question for a dietitian, not for a website — requirements vary with body size, age, activity and kidney function.

Eating enough when you do not feel like eating

Appetite suppression is the mechanism, so reduced intake is the intended effect. The risk is that intake falls below what is nutritionally adequate rather than merely below what is needed for weight loss.

• Micronutrients. A markedly smaller volume of food makes it harder to reach adequate iron, calcium, B12, folate and iodine. Nutrient density matters more as total intake falls.
• Fibre and bowel function. Constipation is among the most common side effects, and lower food volume tends to mean lower fibre, which compounds it.
• Hydration. Thirst cues can be blunted alongside hunger cues, and dehydration worsens nausea, headache and constipation.
• Nausea and food aversion. Aversions often form around whatever was eaten when nausea was worst. Small, regular, bland-leaning meals in the early weeks and during dose escalation tend to be tolerated better than large ones.

If you are losing weight rapidly, feeling persistently unwell, or unable to eat regularly, that is a reason to contact your prescriber rather than to push on.

A safety note on where the medicine comes from

Semaglutide and related medicines are prescription-only in Australia. Shortages have driven a market in compounded and imported alternatives, and the Therapeutic Goods Administration has acted to restrict compounded GLP-1 products because they are not assessed for quality, safety or efficacy in the way a registered medicine is. Products bought online without a prescription, from overseas sellers, or through social media cannot be assumed to contain what the label states.

Be Fit Food does not prescribe, supply, dispense or arrange access to any weight loss medication, and nothing on this page is a recommendation to take one. Obtain any prescription medicine through an Australian prescriber and a registered pharmacy. Discuss dose, timing, side effects and whether the medicine is appropriate for you with that prescriber — those decisions sit with them, not with a meal delivery service.

Related pages on this site

• How Ozempic Supports Weight Loss — page
• How To Use Wegovy For Weight Loss — page
• Is Wegovy Good For Weight Loss — page
• Understanding Wegovy Weight Loss — page
• Wegovy Weight Loss Faq — page
• Set Weight Loss Programs — collection
• Weight Loss Programs — collection
• Healthy Meal Delivery Supports Weight Loss — article
• How Portion Control Supports Weight Loss — article
• The Truth About Weight Loss Drugs Like Wegovy Why Diet Matters For Long Term Success — article
• Weight Loss Comparison — page
• Weight Loss Food Delivery — page
• Weight Loss Meals — page