Individuals following The 1:1 Diet by Cambridge Weight Plan were taken aback today upon discovering the unexpected closure of the company’s Australian branch.

A notice labeled as an ‘update’ appeared on the company’s Australian site, notifying ‘dieters nationwide’ that, ‘after numerous years’ of service, the Australian distributor Slimmerlife ‘will cease distributing The 1:1 Diet products within Australia’.

‘We know this may come as disappointing news if you were hoping to start (or continue) your weight-loss journey with us,’ the update read.

Even though the weight loss venture is concluding its Australian operations, the team assured that some local ‘consultants still possess ample stock and are prepared to assist you, as they have consistently done’.

The notice concluded with the details of six consultants, based in NSW, VIC, WA, and SA, alongside a message encouraging people on the plan to reach out to them for support and products.

‘They’re passionate, knowledgeable, and ready to walk alongside you with one-to-one support every step of the way,’ the update read.

At the time of publication, The 1:1 Diet by Cambridge Weight Plan’s UK website and business appeared to still be operational, as were several overseas distribution websites, including in New Zealand.

FEMAIL spoke to one disappointed Aussie dieter who had only recently started the program and had already experienced incredible weight loss results. 

‘When I saw the message on the website, I rushed to panic order meal replacements,’ the anonymous client said.

‘I’ve been doing the plan since the start of February 2025 and am down 16kg. The thought of losing that progress so suddenly was deflating after two months of hard work.’

The unexpected shut-down left her worried how to continue without the support, structure and products that the program provides. 

‘The diet is all about consistency, that is how I have approached it at least, and losing that makes me nervous I might revert to my previous bad habits – particularly when I haven’t been doing it for that long,’ they said.

‘I have secured one of the remaining consultants but will be trying to stock up as much as possible while they figure out next steps.’

The 1:1 Diet by Cambridge Weight Plan, was previously known as The Cambridge Diet.

The diet was initially developed by Dr Alan Howard at Cambridge University in 1970 before being introduced as a weight loss commercial product in the US and UK in the mid 1980s. 

The name of the plan was changed in more recent years to highlight its point of difference to other weight loss programs; that it offered one-to-one support and personalised plans from its consultants.

The 1:1 Diet by Cambridge Weight Plan is essentially a very low-calorie diet designed for rapid and drastic weight loss. It requires participants to primarily consume low-calorie meal replacement foods, including shakes, soups, porridges and snack bars, before gradually re-introducing healthy meals based around vegetables and protein.

Similar to other ketogenic diets, the diet involves consuming a low-calorie diet and meal replacement products to induce a metabolic state known as ketosis in which the body uses stored fat for energy, resulting in rapid weight reduction.

This particular program offers personalised support from a consultant, who provides customers with an individualised meal plan and supplies them with their meal replacement food products.

News of the weight loss business’ Australian closure comes after weight loss company Jenny Craig shut its doors in 2023.

Jenny Craig, which was founded in 1983, was famed around the world for its personalised weight loss centres and ready-made meal plans.

But the brand found itself struggling to compete with growing competition from other fashionable diets as well as weight loss drugs like Ozempic.