Best PCOS Books: What Each One Gets Right, and Who It Is Wrong For

Disclosure: this page is flagged for affiliate content under PCOSguides’ editorial policy. Some links to the books below may be affiliate links, meaning PCOSguides could earn a small commission on a purchase at no extra cost to you. No book below was rated, ranked by review count, or given a star score — the comparison is on facts you can check yourself: who wrote it, when, and what it tells you to eat.

Is there a single “best” PCOS book?

No — there are six worth knowing about, and the right one depends on your phenotype, your history with restrictive eating, and whether you want a clinical explainer, a cookbook, or a diet protocol. 8 Steps to Reverse Your PCOS (2016) by Fiona McCulloch, ND, a Toronto-based naturopathic doctor, is the most comprehensive general explainer, walking through insulin resistance, inflammation and adrenal patterns with citations throughout. PCOS SOS (2019) by Felice Gersh, MD — a board-certified OB-GYN and integrative medicine physician — covers similar ground from a conventional-medicine background with an added circadian-rhythm framework. Neither book replaces the 2023 international PCOS guideline or your own clinician; both are explainers, not prescriptions.

Which books are written by a credentialed clinician, and which aren’t?

Four of the six carry a clinical or dietetic credential the reader can verify independently; two do not. McCulloch (ND) and Gersh (MD) are licensed clinicians. Angela Grassi holds an MS and is a registered, licensed dietitian nutritionist (RDN, LDN) who has specialized in PCOS for more than two decades. Nadia Pateguana, co-author of The PCOS Plan, is a naturopathic doctor; her co-author Jason Fung, MD, is a nephrologist and bestselling author known for popularizing intermittent fasting, not a PCOS or fertility specialist by training. Colette Harris, co-author of The PCOS Diet Book, is a journalist who has PCOS herself rather than a clinician; her co-author Theresa Cheung is a health writer.

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What is the best PCOS cookbook?

The PCOS Nutrition Center Cookbook (2014) by Angela Grassi, MS, RDN, LDN, is the clearest answer to that specific question, because it is the only one of the six built as a cookbook first rather than an explainer with recipes attached. Grassi founded the PCOS Nutrition Center and has worked exclusively with PCOS clients for over 20 years; the book pairs 100 whole-food recipes with a four-week meal plan and weekly shopping lists, without eliminating a food group. If what you want is dinner tonight rather than a mechanism explained, this is the one built for that.

What is the best PCOS diet book, and is the science still current?

The PCOS Diet Book by Colette Harris and Theresa Cheung, first published in 2002, is the book most searches for that exact phrase return, and it is worth naming its age plainly: it predates the Rotterdam diagnostic criteria’s wide clinical adoption, the current inositol trial base, GLP-1 medications, and the 2026 PMOS rename discussed below. Its low-glycemic-index core recommendation has aged reasonably well against current evidence, but readers should treat any specific supplement or medication guidance in a 2002 text as out of date and confirm current options with a clinician rather than the book itself.

Which book leans hardest on restriction, and why that’s worth knowing before you buy

The PCOS Plan leans hardest, by a clear margin. Fung and Pateguana’s ketogenic-and-fasting protocol reflects real trial data — a 12-week uncontrolled trial of a ketogenic Mediterranean diet in 14 overweight women with PCOS found an average 9.43 kg weight loss alongside significant drops in fasting insulin, HOMA-IR and free testosterone — but that trial had no control group, ran only 12 weeks, and did not test whether the changes held afterward. Structured fasting and macro elimination are demanding protocols to sustain, and they are the wrong starting point for some readers entirely.

Do the “PCOS types” in these books match how PCOS is actually diagnosed?

No, and this is worth stating clearly. Lara Briden’s four PCOS “types” — insulin-resistant, post-pill, inflammatory and adrenal — are a clinical framework she developed to guide her own patient conversations, not the diagnostic phenotypes used to confirm a PCOS diagnosis. Our explainer on the four Rotterdam-based PCOS phenotypes covers the system your doctor is actually using, built on combinations of irregular ovulation, androgen excess and ovarian appearance on ultrasound. Briden’s framework can be a useful way to think about which mechanism might be driving your symptoms, but it is not a substitute for the diagnostic workup, and conflating the two is a common source of confusion between these books and a clinical visit.

Which book fits which phenotype or life stage?

Most of these six books are written with the insulin-resistant, higher-BMI phenotype as the default reader, which is the most common presentation but not the only one. If your pattern is insulin-resistant, McCulloch’s, Gersh’s and Fung’s books all speak directly to that mechanism, with Fung’s the most aggressive intervention of the three. If your pattern is lean PCOS with normal or low insulin markers, none of these six books centers that phenotype specifically, and a ketogenic-and-fasting protocol built for insulin resistance is a poor match for a body that is not insulin-resistant to begin with — worth discussing with a clinician before adopting one. Readers newly diagnosed and wanting the lowest-friction starting point are usually best served by Grassi’s cookbook alongside our own guide to the Mediterranean diet for PCOS, the pattern with the deepest trial base of any of the diets discussed across these six books, and a meaningfully less restrictive one than Fung and Pateguana’s protocol.

Who should skip a restrictive protocol book entirely?

• Anyone with a current or past eating disorder, given the roughly 3-fold higher disordered-eating risk documented in PCOS specifically — a ketogenic-and-fasting protocol is a plausible trigger, not a neutral starting point, for this group.
• Anyone with lean PCOS, since five of the six books default to an overweight, insulin-resistant reader and the sixth (Period Repair Manual) treats PCOS as one chapter among several period problems rather than centering it.
• Anyone actively trying to conceive on a fertility timeline, since none of these books can replace the monitoring, testing or medication decisions a fertility specialist provides.
• Anyone looking for current medication or supplement guidance, since the oldest of these six books is 24 years old and none can reflect trial data published after its print date.

PCOS was renamed polyendocrine metabolic ovarian syndrome (PMOS) in a 2026 global consensus published in the Lancet, agreed by more than 50 organizations. None of the six books above use the new name, since all were published before the change; the condition and its management are unchanged, and this article uses PCOS throughout because that is still what most readers search.

If you’re weighing a specific inositol brand any of these authors recommend, our own comparison of Ovasitol and Ovasitol Plus and our roundup of the best inositol supplements cover dose and certification the same way this page covers books — on checkable specs, not marketing claims. More comparisons like this one are in the site’s ranked guide to the best PCOS products.