What works, and what doesn’t…

With community pharmacy teams increasingly being the first place patients turn to for clarity, Mike breaks down what works, and what pharmacy teams should advise customers to think twice about.

“Firstly,” says Mike, “there are strategies that are evidence-backed, such as diets high in protein and fibre; calorie control in various forms; exercise, and sleep improvement – and these do have plausible and evidence-based roles in weight management.

“Higher protein intake can help preserve lean mass during weight loss, fibre can improve satiety and modestly support weight control, and regular physical activity improves cardiometabolic health and helps with weight maintenance. However, patients often encounter these repackaged as ‘metabolic hacks’, when in reality they are simply the foundations of weight management. Sleep matters too. Poor sleep is associated with overeating behaviours and obesity risk, even though sleep alone is not a weight loss treatment.”

Plausible but modest

Next, we come to the ‘plausible but modest’ category. “Berberine sits here,” says Mike. “It is often marketed as ‘nature’s Ozempic’ but that comparison is a little bit misleading when it’s used as a single ingredient.

“Meta-analyses suggest berberine may produce improvements in weight, BMI and waist circumference, but the evidence is not near the scale, consistency or regulatory standard of licensed anti-obesity medicines. It also is not risk-free.

“At high doses, gastrointestinal adverse effects are common and possible interactions with medicines have been proposed.”

Green tea extract also belongs in this category, says Mike. “Some reviews show effects on body weight or body fat, but the benefits are limited and not dependable enough to recommend it as a meaningful weight loss tool on its own,” he says.

“More importantly, excessive intakes of highly concentrated green tea extract supplements have been linked to occasional liver injury.”

When it comes to intermittent fasting, Mike says it is best described as a dietary pattern, not a metabolic reset: “Evidence suggests it can help some people lose weight, but overall, it performs similarly to conventional continuous calorie restriction rather than dramatically outperforming it.

“If it triggers bingeing, headaches, dizziness or poor adherence, it is not the right fit.”

Other options are fibre-based and multi-ingredient supplements. “These kinds of new OTC supplements combine ingredients rather than including single compounds,” explains Mike.

“This means they are designed to increase satiety (e.g. glucomannan, a soluble fibre), influence glucose metabolism (e.g. berberine, chromium), and affect appetite-related pathways. They also include vitamins and minerals to compensate for any micronutrient deficits which might occur as a result of reduced food intake”.

Mostly hype

Drinking apple cider vinegar is the classic example of an idea that is weakly evidenced. “There are small studies suggesting possible effects on weight and metabolic markers, but the evidence base is still too small and uncertain to support the confident claims seen online,” says Mike.

“Plus, regular acidic ‘shots’ may cause dental erosion and gastrointestinal irritation.”

Detoxes and ‘resets’ are even easier to debunk. “There is very little good clinical evidence that detox diets remove toxins or produce meaningful, sustained weight loss,” says Mike.

“Indeed, the British Dietetic Association is blunt that detox claims are exaggerated and not based on robust science. In most cases, any short-term weight change is down to fluid loss, glycogen depletion, or simply eating less for a few days.”

Similarly, Mike believes that cortisol-targeting supplements deserve particular caution because they often lean on the pseudo medical idea of ‘adrenal fatigue’. “The Endocrine Society states that adrenal fatigue is not a recognised medical diagnosis and warns that there is little evidence to support the use of supplements sold for adrenal health,” he advises.

When to refer

Rather than positioning natural versus non-natural (medical) weight loss, it is more helpful for pharmacy teams to frame weight management as a spectrum that is built on lifestyle foundations, behavioural support (such as NHS apps) and pharmacological and/or nutritional options where appropriate.

Customers can be signposted to useful websites such as NHS Better Health.

Customers should be referred to the pharmacist if they may be eligible for prescription weight management treatments, if they have obesity-related problems such as type 2 diabetes or hypertension, or if an eating disorder is suspected.

By helping patients understand the weight loss landscape, pharmacy teams can support safer choices and more realistic expectations, while maintaining the focus on long-term health.