But Ms Lambert stresses that 'quick fixes never last'.She said: 'They are just that: quick and not sustainable.
Gluten-free substitute foods are bad for your waistline since they contain so much sugar and fat with scant protein, experts warn.
Millions of people swap normal bread for gluten-free versions in a bid to stay trim and have put their own children on this trendy diet, following the example of celebrities like Gwyneth Paltrow, Gisele Bundchen and Alicia Silverstone.
But researchers from the European Society for Paediatric Gastroenterology Hepatology and Nutrition say that the vast majority of gluten-free products are loaded with fattening substances, and miss out the benefits.
The study calls for an overhaul of the lucrative market to incorporate more nutritional value.
A host of other celebrities swear by the Tracy Anderson Method, including Jennifer Lopez, Madonna, Lena Dunham and Kim Kardashian.
But food expert Rhiannon Lambert has hit out at Ms Anderson advocating quick weight loss results.'I am in complete shock that this article has been published as this has the potential to harm a lot of relationships with food,' she told The Independent.
You will experience short-term stress (particularly during your cycle if you’re a woman) – but this can end up being less stressful than living with the stress of excess weight.
Movement is key; you really want to get a solid sweat in for one hour, every day.
Ms Lambert points out that many studies have shown that people tend to lose weight on any diet that restricts a whole food group because overall calories are lower – but it's not healthy.