Why so- called 'superfoods' could be BAD for you: Nutritionist says kale can send your thyroid haywire and quinoa irritates the gut. By. Anna Hodgekiss.

Published. 1. 2: 2. GMT, 7 April 2. 01. GMT, 7 April 2. 01.

Warning: Kale juice, a favourite of healthy eater Gwyneth Paltrow, may cause thyroid problems. They are hailed as the key to health, but so- called superfoods may do more harm than good, a nutrition expert has warned.

Foods such as Gillian Mc. Keith's favourite goji berries, quinoa and kale can cause a host of problems from thyroid malfunction to arthritis flare- ups, says Petronella Ravenshear . Writing in this month's Vogue, she says: 'My only comment about these foods is that they should be avoided'. She goes on to explain that kale - a favourite among celebrities such as Gwyneth Paltrow - and increasingly used in 'green smoothies' can 'interfere with thyroid function' when eaten raw. Eating too many grains such as quinoa, regardless of how healthy they are - can cause an overload of potentially gut- irritating compounds.

This may be because it may not be as wheat- free as originally thought. Meanwhile goji berries are rich in a chemical compound that increases the risk of a digestive syndrome condition called 'leaky gut'. Research last year found that 6.

But the British Dietetic Association has warned that many products giveus false expectations of the benefits or are not fully substantiated. For example, you would need to drink 1. Ms Ravenshear adds that chia seeds - another celebrity favourite - can also cause gut problems. Although high in protein and omega- 3, they swell up to a. While this may help curb the appetite, they are also high in phytates - (antioxidant compounds that have the. Ms Ravenshear.  Not so suepr: Goji berries are rich in a chemical compound that increases the risk of a digestive syndrome condition called 'leaky gut', a nutrition expert has warned.

And goji berries? Consume. with caution, especially if you. Ms Ravenshear said: 'Their [superfoods] appeal is easy to. Many. are rediscovered foods of the ancients, adding an extra layer of. Mayans and Aztecs, amaranth. Incas.'Often best avoided': Chia seeds (left) can stop the absorption of minerals while quinoa (right) can irritate the gut, it has been claimed 'They. Superfoods notwithstanding, their lives were.

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Aztec lived for 3. And. who’s to say they might not have preferred a comforting carrot and. They simply. ate what they could find, and fished and hunted when they got the. Ms Ravenshear's opinions appear in a piece in this month's Vogue magazine. So what should we be eating?

Ms Ravenshear  goes on to explain that at the end of last year, experts at the. Institute for Functional Medicine conference voted for the following foods: avocado. Alaskan salmon. almonds, coconut oil, olive oil and green tea. However, some experts have an even stronger stance. Last year, a leading scientist said fashionable anti- cancer superfoods and supplements do not prevent the disease and may even cause it.

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James Watson - who helped discover the structure of DNA - said the cure for many cancers will remain elusive unless scientists rethink the role of antioxidants, which include vitamin pills and food such as blueberries and broccoli. It is widely believed that superfoods boost health and fight cancer by mopping up oxygen molecules called free radicals.

But Dr Watson argues these free radicals may be key to preventing and treating cancer – and depleting the body of them may be counter- productive. He said a vast number of studies had found antioxidants including vitamins A, C and E and the mineral selenium, to have ‘no obvious effectiveness’ in preventing stomach cancer or in lengthening life. Instead, they seem to slightly shorten the lives of those who take them, and vitamin E may be particularly dangerous.

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