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How Not to Diet by Michael Greger M.D. FACLM Review: Science-Driven Weight Loss Beyond Fad Diets
A New York Times bestseller from the founder of NutritionFacts.org, How Not to Diet dismantles the diet-fad cycle by grounding weight loss in peer-reviewed nutritional science, making a research-dense case for plant-based eating, calorie density, gut microbiome health, and twenty-one evidence-based fat-burning accelerators — a serious, wide-ranging reference for readers willing to engage with the depth of the science.
LuvemBooks Verdict
Best for
Chronic dieters who have cycled through trending approaches without lasting results and want a rigorous, evidence-based explanation of why those approaches fail — and what the science actually supports instead.
Worth it if
You want to understand the mechanisms behind weight loss — calorie density, the insulin index, gut microbiome, chronobiology — rather than simply follow a prescriptive meal plan, and you are open to a plant-based dietary framework backed by dense research citations.
Skip if
You are looking for a concise, quick-start protocol, are firmly committed to a ketogenic or other non-plant-based eating pattern, or find 608 pages of research-heavy reading more exhaustive than you need.
What readers & critics say
Books Google's snippet quotes critical coverage calling it a book "for those who want the facts, not your typical fantasy, filler or fluff," signalling strong praise from at least one major press outlet. The publisher page at us.macmillan.com highlights a peer endorsement from Dean Ornish, M.D., who describes it as "one of the best books I've ever read on how to lose weight in sustainable ways that enhance health."
Sources: Google Books, Macmillan4.7from 7,184 Amazon ratings— reader ratings, not a LuvemBooks score
Look inside the book
Preview the actual pages, via Google BooksIn This Review
- What Works & What Doesn't
- What the Book Actually Is
- The Central Argument and Framework
- Significance and Reception
- Genuine Strengths
- Limitations and Who May Struggle
What Works & What Doesn't
What Works
- Instant New York Times Best Seller from a credentialed physician and founder of NutritionFacts.org, lending strong scientific authority
- Goes well beyond food choices to cover twenty-one evidence-based weight-loss accelerators, including insights from chronobiology and metabolism research
- Directly addresses and evaluates popular competing approaches — ketogenic diets, intermittent fasting, HIIT — rather than ignoring them
- Endorsed by Dean Ornish, M.D., a respected figure in evidence-based lifestyle medicine
- All of the author's proceeds go to charity, including the non-profit NutritionFacts.org
What Doesn't
- At 608 pages, the research-dense format is a significant commitment that may overwhelm readers seeking a concise protocol
- The framework is built squarely on a plant-based dietary foundation, which limits its direct applicability for readers committed to other eating patterns
Dr. Michael Greger's How Not to Diet belongs on the shelf of anyone who has cycled through trending diets without lasting success — and wants to understand why.
What the Book Actually Is
How Not to Diet: The Groundbreaking Science of Healthy, Permanent Weight Loss by Michael Greger M.D. FACLM front cover
Published by Flatiron Books in December 2019, How Not to Diet is a science-focused nutrition reference book — not a memoir, a cookbook, or a brief popular-science overview. Dr. Michael Greger, a physician, internationally recognized nutrition expert, and the founder of NutritionFacts.org, turns the full weight of his research practice toward a single question: what does the evidence actually say about healthy, permanent weight loss? The book is structured in three broad movements: an examination of the root causes and mechanisms of obesity; a detailed framework for an ideal weight-loss diet; and a final section that confronts widely debated approaches — ketogenic diets, intermittent fasting, and high-intensity interval training — alongside questions about exercise, metabolism, and sleep. The result, according to Macmillan's publisher description, is a guide designed to be "timeless" and capable of standing up to any future trend.
“one of the best books I've ever read on how to lose weight in sustainable ways that enhance health”
The Central Argument and Framework
Greger's core thesis, as laid out by the publisher, is that plant-based eating is not merely one option among many but a scientifically grounded foundation for sustainable weight management. He builds this case through a series of concrete dietary levers: calorie density, the insulin index, and the impact of specific foods on the gut microbiome. Rather than prescribing a rigid meal plan, the book identifies the criteria that make a diet effective — a structure that invites readers to reason about food choices rather than follow rules blindly. Beyond diet composition, Greger introduces twenty-one "weight-loss accelerators" — adjunct strategies drawn from fields including chronobiology — that are designed to work in concert with, not in place of, a solid dietary foundation. The book is explicit that these accelerators are supplements to a healthy diet, not shortcuts around one.
Significance and Reception
How Not to Diet debuted as an instant New York Times Best Seller, extending the cultural footprint Greger established with his previous book How Not to Die. Dean Ornish, M.D. — founder and president of the non-profit Preventive Medicine Research Institute and author of UnDo It! — offered a notable endorsement published on Macmillan's own site, calling it "one of the best books I've ever read on how to lose weight in sustainable ways that enhance health" and describing NutritionFacts.org as "one of the most credible sources of science-based nutrition." That kind of peer endorsement from a figure of Ornish's standing in evidence-based cardiology and lifestyle medicine signals the book's credibility within the medical community, not merely in popular wellness circles. Greger also donates 100 percent of his book proceeds to charity, including NutritionFacts.org — a fact that shapes the context in which the work was written.
Genuine Strengths
The book's most distinctive asset is its scope and evidence density. Where most weight-loss titles center on a single mechanism or a proprietary protocol, How Not to Diet ranges across calorie density, hormonal response (via the insulin index), microbiome science, circadian biology, metabolism, sleep research, and the specific claims of competing diet philosophies. Each topic is grounded in citations to research rather than anecdote. Readers who want to understand why a dietary principle holds — not just what to eat — will find that the book is structured around explanation rather than instruction alone. The publisher describes it as "chock full of actionable advice and groundbreaking dietary research," positioning it as a reference that rewards re-reading rather than a one-pass motivational read.
Limitations and Who May Struggle
The very comprehensiveness that makes How Not to Diet authoritative is also its most significant barrier. At 608 pages, the book is a substantial undertaking, and readers expecting a concise, step-by-step protocol may find the research-heavy format demanding. The book's framework is also built firmly on the premise that plant-based eating is central to weight-loss success — readers who are not open to that dietary orientation, or who follow eating patterns that diverge sharply from it, may find the prescriptive direction of the evidence less applicable to their preferences. Additionally, because the book engages seriously with contested diet approaches like ketogenic diets and intermittent fasting, it will directly challenge assumptions held by adherents of those methods — a feature or a friction point depending on the reader's disposition. Those looking for a quick-start guide or a minimalist framework will find the depth here more exhaustive than they need.
Frequently Asked Questions
is How Not to Diet: The Groundbreaking Science of Healthy, Permanent Weight Loss by Michael Greger M.D. FACLM worth reading
If you've cycled through trending diets without lasting success and want to understand the science behind why they fail, the review says this book is genuinely worth your time — it's grounded in peer-reviewed research and endorsed by Dean Ornish, M.D., a leading figure in evidence-based lifestyle medicine, who called it 'one of the best books I've ever read on how to lose weight in sustainable ways that enhance health.' That said, it's a demanding 608-page reference, not a quick motivational read, so it rewards readers willing to engage seriously with the material.
What is this book M.D. FACLM actually about
Rather than prescribing a rigid meal plan, Dr. Michael Greger builds a science-based case for plant-based eating as the foundation of sustainable weight loss, working through concrete dietary levers like calorie density, the insulin index, and gut microbiome health. The book also covers twenty-one 'weight-loss accelerators' drawn from fields including chronobiology, and directly engages with contested approaches like ketogenic diets and intermittent fasting — treating it as a wide-ranging reference rather than a single-protocol diet book.
Does this book M.D. FACLM actually work if you don't want to go plant-based
The review is honest that the book's framework is built firmly on the premise that plant-based eating is central to weight-loss success, so readers who follow eating patterns that diverge sharply from that orientation may find the prescriptive direction of the evidence less applicable to their preferences. It's not a neutral survey of all diets — Greger makes a scientific argument for a specific dietary foundation, which is either a strength or a limitation depending on where you're starting from.
Is this book M.D. FACLM too long
At 608 pages, the review flags length as the book's most significant barrier, noting that readers expecting a concise, step-by-step protocol may find the research-heavy format demanding. The reviewer describes it as a reference that 'rewards re-reading rather than a one-pass motivational read,' so if you're looking for a quick-start guide or minimalist framework, the depth here will likely feel more exhaustive than you need.
Is this book M.D. FACLM good if you already follow keto or intermittent fasting
The book directly confronts ketogenic diets and intermittent fasting, engaging seriously with the claims of both approaches — which the review describes as either 'a feature or a friction point depending on the reader's disposition.' If you're a committed adherent to either method, expect your assumptions to be challenged, not validated.
How is this book M.D. FACLM different from other weight loss books
Where most weight-loss titles center on a single mechanism or a proprietary protocol, the review highlights that this book ranges across calorie density, hormonal response via the insulin index, microbiome science, circadian biology, metabolism, sleep research, and competing diet philosophies — all grounded in research citations rather than anecdote. Greger also donates 100 percent of his book proceeds to charity, including NutritionFacts.org, which the review notes shapes the context in which the work was written.
Is this book M.D. FACLM similar to How Not to Die by Michael Greger
Both books come from the same author and the same research-driven, plant-based framework — the review notes that How Not to Diet extends the cultural footprint Greger established with How Not to Die. The key difference is focus: How Not to Diet turns that same evidence-heavy approach specifically toward the question of healthy, permanent weight loss, rather than disease prevention more broadly.
Sources & Further Reading
The key facts and claims in this review are grounded in the retrieved, verified sources listed below.
- Cited in this review
- 1
us.macmillan.com
- 2
- 3
nutritionfacts.org
- Further reading
- 4
Michael Greger M.D. FACLM, Wikipedia
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- 7
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