Lose up to twenty pounds in four weeks! Discover the next major “health revolution” (The New York Times) with this cutting-edge new program that will help you lose weight, beat disease, and live longer with intermittent fasting—from the #1 New York Times bestselling author of The FastDiet.

Millions of people worldwide have lost weight and reversed disease using Dr. Mosley’s The FastDiet, which revealed the incredible power of intermittent fasting. Clinical studies show that fasting not only helps you lose weight fast, but also improves blood sugar levels and heart health, boosts brain health and function, and is even proven to reduce the risk of cancer recurrence.

Drawing on the latest research and his personal experience gaining and then losing fourteen pounds, “the world’s top gut health guru” (Dr. Barry Marshall, winner of the Nobel Prize for Medicine) returns with an even more effective—yet easier to follow—diet plan designed to reap maximum fasting benefits. The Fast800 Diet pinpoints the ideal fasting calorie count for health and weight loss: 800. Built around a more manageable 800-calorie fasting day—whether that’s 800 calories every day until you achieve your goals, or 800 calories twice a week—Dr. Mosley’s powerful three-phase program is designed to supercharge weight loss and fast-track a healthier life.

Phase 1: A powerful jumpstart designed to accelerate weight loss.
Phase 2: Fast twice a week to sheds pounds without slowing your metabolism.
Phase 3: Discover how to keep the weight off—without calorie counting.

Complete with over fifty-five delicious recipes, four weeks of meal plans, and inspiring success stories, The Fast800 Diet is a simple and life-changing program that gets you real world results.

About The Author

Photograph by David Bostock

Dr Michael Mosley

Dr. Michael Mosley (1957—2024) was the #1 New York Times bestselling author of The FastDiet, FastExercise, FastLife, The 8-Week Blood Sugar Diet, The Clever Gut Diet, and The Fast800 Diet. Dr. Mosley trained to be a doctor at the Royal Free Hospital in London before joining the BBC, where he spent three decades as a science journalist and executive producer. He became a well-known television personality and won numerous television awards, including an RTS (Royal Television Award), and was named Medical Journalist of the Year by the British Medical Association.

Product Details

Publisher: Atria Books (September 1, 2020)
Length: 288 pages
ISBN13: 9781982106904

Raves and Reviews

“The revolutionary new diet by Dr. Michael Mosley, creator of the 5:2 [diet]. It is the most eagerly awaited health book of the year.”

– Daily Mail (London)

“Dr. Michael Mosley has created a practical and easy approach to losing weight fast and sustainably. It is an essential update of the original 5:2, from the creator of the 5:2!”

– Dr. Giles Yeo, geneticist and weight-loss expert, Cambridge University

“A triumph, providing just the right balance of practical advice, scientific reasoning, and hope.”

– Dr. Jack Lewis, broadcaster and neuroscientist

“Dr. Mosley, one of the world’s leading writers covering nutrition and health, does it again with a very informative and entertaining book.”

– Dr. Valter Longo, director of the Longevity Institute, University of Southern California