The Economists' Diet
Economics of eating less
Description
Sometime in the late 2000s, two economists who worked in finance in London and New York found themselves in the same unremarkable situation as a large share of professional adults: they had gained weight steadily through their careers, they had tried the diets everyone tries, and none of it had held. Christopher Payne and his co-author Rob Barnett were not nutritionists. They spent their days modelling markets, arguing about incentives, and treating claims with the reflexive suspicion of people trained to ask what the data actually shows. And yet, when it came to their own bodies, they had been following the same folk wisdom as everyone else — and getting the same disappointing results.
So they did the thing economists do. They stopped trusting the advice and started looking at the mechanism. Both men eventually lost a significant amount of weight and, more to the point, kept it off — which is the part almost every diet fails at. Out of that came a short, plain-spoken book, The Economists' Diet, that reads less like a wellness manual than like a memo from two colleagues who solved a problem and want to show their working. There are no forbidden foods, no branded plan, no supplements to buy. There is instead a way of thinking.
What makes the book worth sitting with is that it refuses the entire register of the diet industry. It doesn't promise transformation, it doesn't sell hope, and it's oddly comfortable telling readers that losing weight will feel unpleasant. That honesty is the whole pitch. Applied to eating, the tools of a trade built on scarcity, incentives and marginal choices turn out to say something quite specific about why most attempts fail and what a durable one looks like.
The question we’re asking : What happens when two economists stop taking diet advice and instead apply the thinking of their own profession to the problem of eating less?What we’ll see : How a discipline built on scarcity, incentives and small daily choices reframes weight loss as a habit problem rather than a knowledge one.
Table of contents
01Chapter 1 — Two overweight economists and a spreadsheet
Payne and Barnett met working in financial research, the sort of job where you are paid to be sceptical for a living. You read a bullish forecast and your first instinct is to ask who benefits from your believing it. That instinct, they eventually realised, was exactly what they had switched off the moment they thought about food. Like most people, they had absorbed a shifting cloud of dietary claims — carbs are the enemy, then fat is, then sugar, then meal timing — and treated each new one as if it might be the missing key.
The trouble was that both of them had been gaining weight for years despite genuinely trying. They had done low-carb, they had done the gym-membership phase, they had done the periods of virtuous eating that collapse after a fortnight. Nothing stuck. And here the economist's reflex finally kicked in: if a product keeps failing for almost everyone who buys it, the problem probably isn't the buyer's willpower. It's the product. The diet industry, they noticed, is enormous, profitable, and coexists with rising obesity — which is not the profile of an industry that works.
02Chapter 2 — Scarcity, not abundance, is the tool
Economics, at its root, is the study of scarcity — how people allocate limited resources against unlimited wants. Payne's small, mischievous move is to point out that most modern eating happens in the opposite condition. We live in permanent food abundance: cheap calories, engineered flavours, a snack within arm's reach at every hour. The environment that surrounds us is optimised to make eating easy, frequent and frictionless. In that world, doing nothing means drifting upward.
Their counter-strategy is to reintroduce a little artificial scarcity into a life that has none. Rather than following a rulebook, they suggest making certain foods genuinely inconvenient — not present in the house, not bought on the way home, not stocked in the desk drawer. The logic is straight from behavioural economics: we are far more governed by what is easy to reach than by what we resolve to do. A biscuit you have to leave the flat to buy gets eaten far less often than one already in the cupboard, and the difference is not moral, it's logistical.
03Chapter 3 — The daily weigh-in and the marginal decision
If one habit sits at the centre of the book, it's the daily weigh-in. Payne and Barnett recommend stepping on the scale every morning — not to fixate on a target, but to install a feedback loop. An economist trusts data over intuition, and the number on the scale is the one honest signal in a system full of self-deception. It catches drift early, before a good stretch quietly becomes a bad month, and it turns a vague sense of how things are going into something you can actually see.
They're clear-eyed about the objection: daily weight bounces around with water, salt and timing, and a single reading means little. That's fine, because they're not reading single points, they're reading the trend. Over a couple of weeks the noise cancels out and the direction is unmistakable. It's the same posture a trader takes toward a jittery market — you don't panic at every tick, you watch the moving average. The scale becomes a dashboard, not a verdict.
04Chapter 4 — When the profession becomes a lens
Step back from the eating, and The Economists' Diet is really a case study in what happens when someone turns the analytic habits of one field onto their own ordinary life. Payne and Barnett didn't discover new nutrition science; they imported a way of reasoning. Suspicion of marketing, respect for incentives, attention to what data shows rather than what feels true, comfort with unglamorous trade-offs — these are professional reflexes, and the book's quiet argument is that they travel further than we assume, into domains that seem to have nothing to do with markets.
There's something bracing in that, and also something limiting, and the authors are more honest about the limits than most. Treating yourself as an economic agent — a creature of incentives and constraints rather than a bundle of good intentions — is genuinely clarifying. It strips away the moral drama that makes dieting so exhausting, the sense that hunger is a test of character. But it also flattens the parts of eating that aren't rational at all: comfort, culture, the meal shared with people you love, the way food carries memory. The economist's lens is powerful precisely because it ignores those things, which is also its blind spot.
05Conclusion
The two men who started out as overweight financial researchers ended up with the one result the diet industry rarely delivers: weight lost and, years on, still off. They got there not by finding the right foods but by refusing to treat the problem as a knowledge problem at all. The environment gets engineered, the scale gets read as a trend, the marginal portion gets a moment of thought, and the occasional bad weekend gets absorbed rather than mourned. It is a system, not a burst of resolve.
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