Has AI Already Killed How-To Nonfiction? Sales Trends, My Personal Data, and What It Might Mean for the Future - The Blog of Author Tim Ferriss Has AI Already Killed How-To Nonfiction? Sales Trends, My Personal Data, and What It Might Mean for the Future - The Blog of Author Tim Ferriss Podcast All Episodes Sponsorship & Advertising Sponsors of The Tim Ferriss Show Podcast 30-Day Challenges (3) 4-Hour Case Studies (50) Comfort Challenges (4) Entrepreneurship (63) Filling the Void (97) Low-Information Diet (42) Mental Performance (42) Mini-retirements (24) Opening the Kimono - OTK (3) Outsourcing Life (17) Physical Performance (50) Practical Philosophy (39) Protecting Time (16) Quarterly Shipments (3) Rockstar Living in... (5) The 4-Hour Body - 4HB (54) The 4-Hour Chef - 4HC (39) The 4-Hour Chef Recipes (1) The Book - 4HWW (45) The Slow-Carb Diet (5) The Tim Ferriss Experiment - TFX (11) The Tim Ferriss Show (818) The Tim Ferriss Show Transcripts (634) Tim Ferriss Book Club (6) Tribe of Mentors (11) Writing and Blogging (71) Has AI Already Killed How-To Nonfiction? Sales Trends, My Personal Data, and What It Might Mean for the Future Topics: Writing and Blogging My head has been spinning after getting a spreadsheet roughly a week ago. Before we dive into my dirty laundry, let's state the obvious: millions of people have a vague sense that AI is changing things. And LLMs sure are convenient for getting answers quickly. My team and I use Claude and other tools daily. But far fewer people have first-hand experience with the speed and intensity of disruption that's happening. Not in a year, not in six months, but right now. So let me show you, using my own books as the cadaver on the table, what a fatality looks like. First, some broader stats For the first three months of 2026, Publishers Weekly reported that "adult nonfiction" was down 9% from Q1 2025. Who knows... maybe in line with historical fluctuations? But looking more closely, Self-help had the steepest subcategory decline, with units down 26.3% year-over-year. Only two of 16 subcategories-crafts/hobbies/antiques/games and religion-grew at all (9.6% and 1.6%, respectively). The exceptions alone could make an interesting blog post for another time. But, let's be honest: one quarter doesn't make a trend. So let's zoom out and look at my full catalog over a few years. My personal sales numbers Below are the domestic print numbers (BookScan) for my five books-The 4-Hour Workweek, The 4-Hour Body, The 4-Hour Chef, Tools of Titans, and Tribe of Mentors-as a portfolio. Keep in mind that all of these were #1 NYT and/or WSJ bestsellers, and The 4-Hour Workweek was one of the most highlighted books across all of Amazon in 2017, a full decade after publication. The sales have been surprisingly durable... and predictable. These books have long been an annuity that I could count on. There's trouble in paradise: 2026 (run-rate)-57% vs. 2025 Let that sink in for a minute. ChatGPT, powered by the updated GPT-3.5 model, launched on November 30, 2022. There was a gentle -5% slip in 2023, then -13% in 2024, and then the floor disappears: -46% in 2025, followed by an even steeper -57% pace this year. If the run-rate holds, my catalog will sell roughly 80% fewer print copies in 2026 than it did in 2022, with almost all of that happening since LLMs like Claude and ChatGPT exploded in use. But what about ebooks and audio? Looking at all formats (print + ebook + audio) for the catalog in 2025, the second half of the year was down ~45% versus the first half. Now, there are caveats, of course. We could talk about Amazon stocking changes, post-pandemic shifts of spending, a few potential exceptions, reversion to the mean after outlier events (e.g., TikTok virality of The 4-Hour Body in 2024, thanks to Gary Brecka), and so on. But, even if I try my best to steelman a counter-argument... it's all fancy-talk and wishful thinking. I don't believe any constellation of footnotes begins to explain a near-vertical drop in prescriptive nonfiction. Many of the strongest self-help franchises on the planet-standout darlings with perennial dominance-are also getting hammered. These are the best performers. You see them on endcaps everywhere books are sold. But if you look at BookScan sales for 2025 vs 2026 thus far, and do a little math, it ain't pretty. If you rightly assume that self-help books tend to sell the most copies in H1, the biggest names I could think of will be down ~40-60%. My agent, who has decades of statements to compare against, put it bluntly: 2025 was the first big drop, 2026 looks more severe, and the only thing that's really changed in that timeframe is the acceleration of AI. Some publishers point to the growth of YouTube and podcasts, and those certainly contribute, but I think they are relative rounding errors. What's actually going on? Think about what my books are, functionally speaking. Links
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