Patrick Holford, a trained psychologist, is the UK’s leading nutritionist and the founder of The Institute for Optimum Nutrition, which is at the forefront of nutritional education and research. – He is the author of many bestselling books published by Piatkus including The Optimum Nutrition Bible and is regularly featured in the media. He lives in London. – Dr Hyla Cass is Assistant Clinical Professor of Psychiatry at the UCLA School of Medicine. She is the author of several books including St John’s Wort: Nature’s Blues Buster and Kava: Nature’s Answer to Stress, Anxiety and Insomnia.

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Books by Patrick Holford