Everything You Need to Know About Weight Loss: GLP-1s, Food, Lifestyle and Supplements

Over the last few years, GLP-1 weight loss drugs have appeared on the scene and rapidly risen in popularity, and for good reason. It is estimated that 64% of adults in the UK are now overweight or obese. We are living in a society where ultra-processed food is cheap, readily available and heavily marketed, while eating patterns have shifted away from regular, shared meals towards convenience and eating on the go.

At the same time, science has transformed our understanding of weight. We now know that weight management is not simply a matter of willpower or calories. Differences in hormones, gut health, stress, biology and metabolic responses mean that some people find it far harder than others to regulate appetite and body weight, even when eating similar foods.

For many people, weight loss medications have offered a genuine lifeline. But they are not suitable or accessible for everyone. Cost is a major factor, side effects are commonly reported, and there are important nutritional considerations. These medications significantly reduce appetite, which can inadvertently lead to insufficient protein and micronutrient intake, muscle loss, digestive symptoms and fatigue if not carefully managed.

There is also the longer-term question: what happens when someone wants to stop taking them? Without appropriate dietary and lifestyle support, weight regain is common.

As a result, many people are exploring alternatives. My inbox is full of companies promoting so-called “natural GLP-1 alternatives”, and our clients regularly ask whether these products actually work.

In this article, I’ve brought together the research, the biology and my clinical experience to help you make sense of the noise, and make informed decisions.

As always, a personalised approach is essential. We are all different, and weight management requires an individual plan. I encourage you to book a free 15-minute health review with one of the nutritional therapists at Amaranth Wellbeing for tailored guidance. We only stock products supported by credible research, appropriate dosing and ethical marketing, and we actively avoid products that over-promise or mislead.

In this article, I’ll cover:

• The biological mechanisms involved in weight management
• How modern weight loss drugs work
• Why insulin, cortisol and the gut microbiome matter
• How this knowledge helps you assess “natural” weight loss products
• Which supplements are actually worth considering

The Biological Mechanisms Involved in Weight Management

Before discussing supplements or medications, it’s essential to understand how weight loss works in the body. Without this foundation, it’s impossible to judge whether any intervention, natural or medical is likely to help.

At its simplest, weight management is often described as energy in versus energy out:

• Energy in refers to calories consumed from food. Protein, carbohydrates and fats each contribute differently.
• Energy out includes calories used for basic bodily functions at rest, physical activity and the maintenance of muscle mass.

For decades, weight loss advice focused almost entirely on calorie reduction. Programmes like SlimFast, Weight Watchers and Slimming World all approached this differently, but the principle was the same: eat fewer calories.

While calorie reduction can lead to short-term weight loss, it has significant limitations:

• It ignores blood sugar and insulin responses
• Low-calorie does not mean nutrient-dense or satisfying
• Hunger, cravings and “food noise” often increase
• Metabolic adaptation reduces energy expenditure over time
• Weight regain is common

Despite decades of dieting culture, obesity rates have continued to rise. Clearly, there is far more to the story.

Hormones, Enzymes and Appetite Regulation

Advances in metabolic science show that bodies respond very differently to food. Hormones, blood sugar control, gut bacteria and stress all influence appetite, fat storage and energy use.

Modern weight loss drugs work because they target the biological drivers of hunger and satiety, rather than relying on willpower alone. Understanding these pathways also helps us assess which foods and supplements may, or may not, be useful.  I’ll try here to explain the main enyzmes and hormones involved in appetite regulation.

 

1. AMPK: The Metabolic Master Switch

AMPK (AMP-activated protein kinase) is an enzyme that acts as the body’s cellular energy sensor. When energy levels are low, AMPK is activated, signalling the body to generate more energy.

Activation of AMPK leads to:

• Increased fat burning
• Improved insulin sensitivity
• Reduced fat and cholesterol synthesis

AMPK can be activated naturally through exercise, periods of fasting, and some medications (such as metformin). Certain botanicals, including berberine, resveratrol and EGCG from green tea, may also influence this pathway and I’ll come onto these later.

 

2. GLP-1: The Hormone Behind the Headlines

GLP-1 (glucagon-like peptide-1) is a hormone released from specialised cells in the gut after eating. It plays a central role in appetite regulation and blood sugar control.

GLP-1:

• Stimulates insulin release when blood sugar rises
• Suppresses glucagon
• Promotes fullness and reduces appetite
• Slows gastric emptying
• Improves insulin sensitivity over time

In simple terms, GLP-1 helps regulate how much we eat and how efficiently we use energy.

Medications such as Wegovy, Ozempic and Mounjaro are GLP-1 receptor agonists. They activate the GLP-1 receptor in a stronger and far longer-lasting way than the body’s own hormone. Natural GLP-1 lasts only minutes before being broken down whereas GLP-1 agonist drugs resist breakdown and remain active all day

This sustained activation of GLP-1 by the medications, reduces appetite, slows digestion and improves blood sugar control. However, constant activation of this pathway is not natural and may explain common side effects such as nausea, reflux and gastrointestinal discomfort.

 

3. Insulin: The Metabolic Gatekeeper

Insulin plays a crucial role in how food is used and stored. After eating carbohydrates:

• Blood glucose rises
• Insulin is released
• Glucose is moved into cells for energy or storage

Insulin also suppresses fat breakdown. When insulin levels remain high, fat loss becomes difficult. Chronically elevated insulin (which can be driven by refined carbohydrates, stress, poor sleep, inactivity and hormonal changes),can lead to insulin resistance, a major driver of weight gain, PCOS, type 2 diabetes and mid-life metabolic changes. Nutrition, movement, sleep and stress management are foundational for improving insulin sensitivity.

 

4. Cortisol: Stress and Weight Gain

Cortisol is often overlooked in weight discussions, yet it has a profound influence. Chronically elevated cortisol:

1. Suppresses GLP-1 release
2. Increases appetite and cravings
3. Promotes insulin resistance
4. Encourages abdominal fat storage

Excessive fasting or over-exercise, particularly in women, can raise cortisol and undermine weight loss efforts. Sustainable weight management must include stress regulation.

 

5. The Gut Microbiome

The gut microbiome plays a central role in appetite regulation and metabolism. GLP-1 is released following the fermentation of dietary fibre by healthy gut bacteria, making gut health foundational to weight management.

Modern diets, antibiotics, hormonal changes and low fibre intake all negatively affect the microbiome. Supporting microbial diversity through fibre-rich foods is essential for long-term metabolic health.

Natural Alternatives to Weight Loss Drugs: Do They Work?

Weight management is far more complex than simply “eating less”. By now, it should be clear that modern weight loss drugs work by targeting biological pathways, particularly GLP-1 signalling to reduce appetite, quieten food noise and improve insulin sensitivity. This raises an important question: can natural supplements work in the same way as GLP-1 weight loss medications?

The short answer is no. Natural supplements cannot replicate the potency or duration of pharmaceutical GLP-1 receptor agonists. Weight loss medications are specifically engineered to resist enzymatic breakdown, keeping GLP-1 receptors activated throughout the day.

This does not, however, mean natural approaches are ineffective. When used appropriately, certain supplements can support the same metabolic pathways involved in weight regulation including appetite control, insulin sensitivity, GLP-1 signalling and gut health, but in a gentler, more physiological way.

How Natural Weight Loss Supplements Work

Most supplements marketed for weight management fall into one or more of the following categories:

• Supporting satiety and appetite regulation

• Improving insulin sensitivity and blood sugar balance

• Enhancing natural GLP-1 release or slowing its breakdown

• Supporting gut health and the microbiome

It’s important to note that the evidence for many supplements comes from small human trials or mechanistic studies. For this reason, understanding how an ingredient works is just as important as the headline results.

Equally as important, supplements are only effective when provided at research-backed dosages, in bioavailable forms, from high-quality manufacturers.

Ingredients you may find in Weight Management Supplements : The Evidence

Many of the new weight management supplements appearing on sale contain the same ingredients (although not in the same quality or dosage).  Here is further information on the ingredients that you may find on the label, to help you assess the potential benefits.

 

1. Metabolaid®: Botanical Support for GLP-1 and Fat Metabolism

Metabolaid is a patented blend of Hibiscus sabdariffa and lemon verbena and is one of the most researched botanical ingredients used in natural weight management supplements.

Research suggests Metabolaid may:

• Activate AMPK, supporting fat oxidation

• Influence GLP-1 and ghrelin, improving satiety

• Support the gut microbiome

• Improve cholesterol and metabolic markers

Clinical trials using 300 mg daily for 90 days have shown an average 3 kg weight loss, primarily from fat mass, with no significant loss of lean muscle. While the results are promising, it shoud be noted that the trials are relatively small. Metabolaid should be viewed as a GLP-1 enabler, not a GLP-1 mimic. It encourages short-lived, natural GLP-1 release rather than the sustained activation seen with weight loss drugs.

2. Berberine: Insulin Sensitivity and Metabolic Support

Berberine is a plant-derived compound found in herbs such as barberry and goldenseal. It is best known for its effects on insulin resistance and blood sugar regulation.

Evidence suggests berberine may:

• Activate AMPK

• Improve insulin sensitivity

• Reduce glucose production in the liver

Human studies show modest reductions in BMI and waist circumference, with more consistent benefits seen in blood glucose control. Doses of 1,000–1,500 mg per day appear most effective.

Berberine is most beneficial for individuals with:

• Insulin resistance

• PCOS

• Metabolic syndrome

• Midlife or stress-related weight gain

3. Bioactive Peptides including DNF-10

Certain bioactive peptides derived from food proteins have shown potential for appetite and weight regulation. One peptide of interest, DNF-10, mildly inhibits DPP-4, the enzyme responsible for breaking down GLP-1.

By slowing GLP-1 degradation, these peptides may:

• Prolong satiety signals

• Reduce energy intake

• Improve post-meal glucose control

Small human trials using yeast protein hydrolysate have reported weight loss of 1.6–2.6 kg over 8–10 weeks, with reductions in fat mass and no loss of lean muscle.

4. Glucomannan (Konjac Fibre): Satiety and Appetite Control

Glucomannan is a water-soluble fibre derived from the konjac plant. It is reported to have benefits for weight management by :

• Absorbing water and expands in the stomach

• Slowing gastric emptying

• Promoting feelings of fullness

While early studies suggested modest weight loss, later trials have shown mixed results. A meta-analysis concluded that overall weight loss effects were not statistically significant. Glucomannan may help manage hunger when taken before meals, particularly alongside dietary changes but it is not an effective stand-alone weight loss supplement.

 

5. Green Tea Extract: 

Green tea extract is rich in polyphenols, particularly EGCG, which has been linked to increased fat oxidation and energy expenditure.  Research, however, shows only small reductions in body weight and fat mass with green tea extra supplements, with the most consistent benefits seen when higher-dose extracts are taken for 12 weeks or longer, alongside diet and exercise.

In my view, green tea extract is best viewed as a supportive metabolic and antioxidant supplement, rather than a primary weight loss tool.

6. Chromium: 

Chromium is an essential trace mineral involved in insulin signalling. Supplementation has been shown to improve insulin sensitivity and blood glucose control in insulin-resistant individuals. Studies using 200–1,000 mcg per day of chromium picolinate report modest improvements in glucose regulation, appetite control and lipid profiles.

Chromium may be supportive for those with prediabetes, type 2 diabetes or PCOS, but is unlikely to benefit weight control in individuals with normal insulin sensitivity.

 

7. Cinnamon: 

Ceylon cinnamon extract also has evidence for improving glucose uptake and insulin sensitivity. Clinical trials suggest modest reductions in fasting blood glucose and small improvements in body composition, particularly in individuals with insulin resistance.

In my opinion, cinnamon is most effective when used as part of a multi-ingredient supplement, rather than alone.

 

So… Do Natural Weight Management Supplements Work?

My opinion is that some weight support supplements may have a positive effect but this very much depends on the selected ingredients, purity and dosage. Supplements do not work in the same way that weight loss drug do – they don’t override appetite or produce rapid weight loss but instead, they support the same biological pathways in a gentler way and work best when combined with food, movement, sleep and stress support.

The foundations have to be food and lifestyle, and the most effective long-term strategies remain:

1. Prioritising protein and fibre
2. Supporting blood sugar balance
3. Strength training and gentle movement
4. Managing stress and protecting sleep
5. Supporting gut health through dietary diversity

In my option, the right, carefully selected weight management supplements are best viewed as:

• Supportive tools, not replacements
• Most effective when combined with diet, movement, sleep and stress regulation
• Particularly useful for weight maintenance or metabolic support after weight loss

Specific Supplements: Which Weight Management Products Are Actually Worth Considering?

Finally, this is often the part people really want to get to, out of all the weight loss supplements on the market, are any actually worth taking?

I’ve spent a considerable amount of time reviewing the research, ingredient profiles and formulations available. Below are the products I currently feel most comfortable recommending, based on evidence, dosing and realistic expectations. None of these are quick fixes, but when used appropriately, they may provide meaningful support alongside diet and lifestyle changes.

1. Dr Vegan Weight Support

Dr Vegan Weight Support is a relatively simple, well-formulated product that centres around Metabolaid®, a patented botanical blend of hibiscus and lemon verbena.

This formula provides 500 mg of Metabolaid, which aligns well with the dosages used in clinical research. Human trials using 300 mg daily for 90 days have shown an average weight loss of around 3 kg, primarily from fat mass, with no significant loss of lean muscle. Metabolaid appears to:

• Activate AMPK, supporting fat oxidation
• Influence GLP-1 and ghrelin, supporting satiety and appetite regulation

While the human trials remain relatively small, the results are encouraging and biologically plausible. Dr Vegan Weight Support also contains:

• 100 mg green tea extract (equivalent to approximately 3 g of green tea), providing antioxidant and metabolic support
• 200 mcg chromium, which may support insulin sensitivity and appetite regulation in insulin-resistant individuals

Overall, this is a solid, research-aligned option for those looking to support appetite regulation and metabolic health.

View the product here.

2. Wild Nutrition Weight Management Support

Wild Nutrition’s Weight Management Support also includes Metabolaid, at the same 500mg dosage, but in addition this formula provides a comprehensive profile of vitamins and minerals, meaning it can also function as a daily multi nutrient. There is a greater emphasis on liver and metabolic support, which may be helpful for some individuals.

The chromium dose is lower than in some standalone products, and the price point is higher, but for those looking for an all-in-one option, this can be a convenient and well-designed formula.

View the product here.

3. Natroceutics Berberine

For individuals where blood sugar balance and insulin resistance are key drivers of weight gain, berberine remains one of my preferred ingredients. From the available evidence, berberine appears to have:

• Stronger support for improving insulin sensitivity than chromium or cinnamon
• Additional influence on AMPK activation, which may support metabolic health

Berberine is particularly relevant for people with insulin resistance, PCOS or midlife weight gain. However, if you are taking metformin or other glucose-lowering medications, caution is advised and supplementation should always be discussed with your GP or healthcare provider.

View the product here.

4. Cytoplan Satiety Support

Cytoplan Satiety Support is a newer and more innovative product. Its primary active ingredient is yeast protein hydrolysate, derived from a specific strain of Saccharomyces cerevisiae. This process releases bioactive peptides, including DNF-10, which has been shown to mildly inhibit enzymes involved in the breakdown of GLP-1 and GIP. By slowing this breakdown, natural satiety signalling may be enhanced.

Clinical studies using yeast protein hydrolysate have reported:

• Reduced hunger
• Lower calorie intake
• Modest but meaningful weight loss
• Reductions in fat mass and abdominal fat
• No loss of lean muscle mass

This product is very new to the market, so we do not yet have extensive client feedback. However, the mechanism of action is well understood, and the approach is far gentler and more physiological than pharmaceutical GLP-1 medications that keep receptors switched on continuously.

View the product here.

 

A Final Word on These Supplements

With the exception of berberine, the products listed above have been available for less than six months. Based on the evidence currently available, I feel comfortable introducing these options to clients, particularly when compared to many of the heavily marketed products circulating online and on social media.

As always, supplements are supportive tools, not solutions in isolation. I look forward to updating this section as we gather real-world feedback from clients and as the research

At Amaranth Wellbeing, we believe in evidence-based nutrition, realistic expectations and ethical recommendations. If you’re navigating weight changes and want support that looks at the whole picture, personalised guidance makes all the difference.

Book your free one to one health review with a registered nutritional therapist today.

Full nutritional therapy consultations and detailed diagnostic health testing services are also available.