Tracy Anderson hates juice cleanses as they encourage unsustainable "extreme dieting".
The Hollywood fitness guru is responsible for toning and honing some of the finest figures in the entertainment industry.
Gwyneth has previously advocated the use of the juice cleanses to help shift weight fast, but health and fitness expert Tracy says they are to be avoided at all cost.
"I 100 per cent hate them. I think it's a really unfortunate trend, and it's not a sustainable weight-loss program. Plus, once you puree anything, you lose nutritional value by the second. You're drinking calories: If you're going to drink that many calories, you might as well eat anyway. It's extreme dieting," Tracy ranted to Allure magazine. "Skinny is not the end all for beauty - a lot more goes into being beautiful than [whether you] have extra weight on you."
Tracy's clients have included Jennifer Lopez, Courteney Cox and her biggest fan Gwyneth. The trainer explained her latest project, which is an expansion of her fitness empire, including food as well as exercise programmes.
Tracy chatted about her US food-delivery program, which launched earlier this month.
"Nutrition is something I've been in for 15 years. When I started the [Tracy Anderson] Method, part of transforming these women was making sure they lose weight as their muscular structure changes. It takes time to get good at fitness, and nutrition is a huge component to wellness. I don't like people to live on diets," she explained.
"There's so much confusion out there - from protein bars to shakes to diets to counting calories. I became frustrated with what's being sold as diets to help people lose weight. They're not sustainable and they're pumped with chemicals - if you leave it to people to calorie-restrict, they'll be like, 'Oh, I'll have my soy latte because it's this many calories, and then I'll have this little Weight Watchers cake.'"
This initiative is the latest launch from the entrepreneur and follows her recently announced new fitness suite and blow-dry bar in Los Angeles.
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