GLP-1 medications are the most talked-about — and most misunderstood — drugs in medicine right now. Ozempic, Wegovy, Mounjaro, Zepbound: the names are everywhere, the opinions are loud, and somewhere between the miracle stories and the fear stories, patients are left to make a medical decision with very little actual medicine in the conversation.
That’s why I want to point you to a book that gets this right: Weightless: A Doctor's Guide to GLP-1 Medications, Sustainable Weight Loss, and the Health You Deserve (Rodale Books, December 2025), by Rocio Salas-Whalen, MD — a board-certified endocrinologist and obesity medicine specialist, fellowship-trained in endocrinology, diabetes, and metabolism, who founded New York Endocrinology in New York City. The foreword is by Dr. Mary Claire Haver, whose work many of you already know. Mel Robbins calls the book "a game-changer" — and for once, the blurb undersells it.
The reframe that matters most
Dr. Salas-Whalen’s starting point is the one I build my own practice on: obesity is not a character flaw. Her publisher describes her approach as seeing obesity “not as a personal failure but as a chronic health condition that deserves medical treatment.” Her first chapter is literally titled “Rethinking Obesity: What We Got Wrong.”
That reframe changes everything downstream. If obesity is a chronic, complex disease — driven by hormones, genetics, environment, and physiology — then treating it with medication isn't a shortcut or a surrender. It's medicine, the way we treat blood pressure or thyroid disease: without shame, and without apology.
As Dr. Salas-Whalen puts it: "I want people to make an informed, educated decision, not one based on fear." She reminds readers that these are not new medications — the first GLP-1 drug was FDA-approved in 2005 for type 2 diabetes, which means we have more than two decades of safety data behind them. And she clears up a common misconception: there is no "GLP-1 deficiency." People with obesity don't have less of this gut hormone than lean people do — the medications are engineered, long-acting versions of a hormone your own body already makes.
What the book actually teaches
Weightless is a working guide, not a pep talk. It walks through:
Starting well — picking a provider who actually knows these drugs, what to ask at each visit, and how to make telehealth work in your favor.
Preserving muscle — her guidance on protein intake and strength training, because the number on the scale is not the outcome that matters. (My patients hear my version of this constantly: the goal here is not skinny — it’s strong. It’s fit.)
Protecting your progress — handling side effects with proven strategies, spotting when the dose needs adjusting, and knowing your options if the medication stalls.
Life after GLP-1s — the physical, social, and emotional aftershocks of major weight loss that nobody warns you about, and how to keep the results if you eventually stop the medication.
That last section is the one most GLP-1 conversations skip entirely — and the one that decides whether the medication becomes a turning point or a temporary detour.
Where I’d add my own emphasis
I read this book as a preventive physician, and the places Dr. Salas-Whalen and I agree most are the places I’d underline for my own patients:
Measure composition, not just weight. A GLP-1 can take off fat and muscle alike. Before, during, and after treatment, I want body-composition data — DEXA, strength, function — not just a scale number. Losing twenty pounds while losing your muscle is not a win.
The medication is the tool, not the plan. Protein, resistance training, sleep, and follow-up labs are what convert weight loss into health. Support matters: these drugs deserve a clinician who adjusts, monitors, and knows you — not an auto-refill.
Plan the long game from day one. What happens at your goal? What does maintenance look like? A good GLP-1 journey starts with those answers, not just a first prescription.
If you’re considering a GLP-1 — or already on one and feeling under-guided — read Weightless. Then bring your questions to a clinician who will treat your weight the way Dr. Salas-Whalen does: as medicine, not morality.
— Pooja Singh, MD
This post is educational and is not personalized medical advice. GLP-1 medications are prescription treatments with real indications, risks, and contraindications — whether one is right for you is a decision to make with your own care team.
Sources
Salas-Whalen, R. Weightless: A Doctor’s Guide to GLP-1 Medications, Sustainable Weight Loss, and the Health You Deserve. Rodale Books, 2025. Publisher’s page: penguinrandomhouse.com/books/806992/weightless-by-rocio-salas-whalen-md/
Weight Watchers Book Club: Weightless by Dr. Rocio Salas-Whalen — discussion and quotes, weightwatchers.com/us/blog/book-club-weightless