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WeightWatchers attributes points to food and drink, stating that it uses a "groundbreaking algorithm" to assess their nutritional makeup and then uses a point system to inform its members which food is better to eat.

At its peak, WeightWatchers was seen as being synonymous with safe and controlled weight loss.

WeightWatchers says it uses an "holistic model of care" to support "the whole person" with "access to obesity-trained clinicians and registered dietitians".

At first glance, it could be a WeightWatchers class – women meeting up to share their stories of weight loss and support each other – but there are crucial differences, says BeeWeighed owner and founder Lynda Leadbetter.

She was a group leader for WeightWatchers for 18 years but left to set up her own group in 2018.