You're doing the thing that's supposed to make this impossible. Riding several times a week, maybe racing on the weekend, watching mates who don't train at all — and the scale is creeping up anyway. It feels like a betrayal, and the explanations people reach for (broken metabolism, "muscle weighs more than fat", age) mostly don't survive contact with the numbers.
Here's the boring, fixable truth: in the overwhelming majority of cases, riders who gain weight while training regularly are eating for a training load they no longer have.
The Habit Lag
Think back to the block that got you fit. Big winter and spring weeks — ten, twelve hours, long weekend rides, mid-week sessions. Your eating adapted to that, mostly without conscious decisions. Portions grew. The mid-morning snack appeared. The café stop became structural. Second helpings stopped registering as second helpings. That's your body doing its job — you needed the fuel, and appetite plus habit delivered it.
Then the calendar changed. Racing started, or life compressed the schedule, and the twelve-hour weeks became six or seven — tapers, travel days, an hour-long crit where a four-hour ride used to be. Expenditure dropped by a third or more.
The eating didn't drop with it. It almost never does, because by now it isn't decisions — it's routine. The same breakfast, the same portions, the same snacks, all calibrated to a workload that ended in April.
Run the arithmetic on that gap. A modest 250-calorie daily surplus — one habitual snack, slightly generous portions — is invisible on any given day. Across a fourteen-week race season it's north of 24,000 calories, which is roughly three kilos of drift. No bingeing, no broken metabolism, no moral failure. Just a mismatch nobody was watching.
Rule Out the Impostors First
Before fixing anything, make sure you're diagnosing the right problem — two things masquerade as fat gain and aren't.
Glycogen and water. Every gram of stored carbohydrate holds roughly three grams of water. Carb-load before an event, or refuel a big weekend properly, and the scale jumps a kilo or two overnight. That's fuel, not fat, and it drains away within days. If you only weigh yourself after big-eating days, you're measuring your fuelling, not your body composition. Judge the trend over three to four weeks, same conditions each time — morning, after the bathroom, before breakfast.
New muscle. Real, but slower and smaller than riders hope. A trained cyclist adding a kilo of genuine muscle over a season is doing well; it doesn't explain a climbing monthly trend line. If the trend rises steadily for two months, it's overwhelmingly likely to be energy surplus.
Neither impostor survives the trend test. A steady climb, month over month, is the mismatch.
The Under-Fuelling Boomerang
There's a second pattern worth naming, because it's common and it looks like a discipline problem when it's actually a fuelling problem.
A rider notices the weight creeping up, decides to be "good", and starts stripping food out of weekdays — light breakfast, salad lunch, unfuelled evening sessions. Tuesday to Friday looks virtuous. Then the weekend arrives: a long ride on empty, ravenous hunger by 2pm, and an afternoon-long graze through the kitchen that undoes the week and then some. Sunday brings guilt, Monday brings another restriction cycle, and the scale doesn't move — except slowly upward.
The deficit you force on Tuesday gets repaid with interest on Saturday. Under-fuelling training doesn't just make the riding worse — it hands control of your intake to a hunger response you can't out-discipline. Nobody white-knuckles their way past a body that's actually run dry.
If your weeks look restrained and your weekends look like damage, you don't have a willpower problem. You have an under-fuelling problem wearing a willpower costume.
The Fix: Match the Fuel to the Work
The framework that solves this is the one performance nutrition has been converging on for years, and it has a name: fuel for the work required. We've covered the research side in depth with Dr James Morton on the podcast; the day-to-day version is refreshingly simple.
Carbohydrate tracks the day. Protein stays constant. That's the whole engine.
Hard days — races, intervals, long rides — get fuelled fully and without apology. Carbs before, carbs during anything much past an hour, proper refuelling after. These days are why you train; starving them is self-sabotage.
Easy days — recovery spins, short social rides — need less. Normal meals, smaller carb portions, no riding snacks for riding that doesn't demand them.
Rest days — the same logic, one step further. This is where most of the drift lives, because a rest day fuelled like a training day is pure surplus. Trim the carbs, hold the protein, and don't call it dieting — it's just matching.
In practice you're building three day-templates and assigning them to the calendar each week. No weighing, no logging, no apps unless you enjoy them. The point is that your eating finally has the same structure your training does.
Two guardrails. First, protein is non-negotiable and identical every day — it protects muscle and recovery while the carb dial moves. Second, race week is exempt: carb-loading before an event that matters is doing its job, and the water weight it brings is the cost of a full tank. Weigh yourself in race week and you're reading noise.
For the deeper mechanics of the framework, the full FFTWR explainer walks through it step by step, and the fuel-for-the-work-required approach to weight loss covers the deliberate-deficit version.
What Not to Do
The blanket cut. It's always tempting — eat less of everything, everywhere, starting Monday — and in-season it's nearly always the wrong move. You lose the fuelling that makes your key sessions good, keep the habit structure that caused the drift, trigger the weekend boomerang, and trade a body-composition annoyance for a performance problem. Flat legs, slow recovery, and a scale that barely notices.
If the goal is racing well, an extra kilo fuelled properly beats a lighter body running on empty — and it isn't close. Meaningful weight change is an off-season project, done patiently when there's no form to protect. In-season, the job is stopping the drift and racing fast, in that order. Losing weight without losing power covers how to sequence that properly, and if you're not sure what you should weigh in the first place, finding your race weight is the place to start.
A Simple Two-Week Audit
If you want certainty before changing anything, run this for a fortnight. Note your actual riding hours and rough intensity each day. Weigh yourself three mornings a week, same conditions. Don't change your eating at all — just photograph or jot each day's food in one line.
What almost always emerges: the eating is nearly identical every day, while the training swings from zero to hard and back. That flat line of intake against a wildly variable line of output is the diagnosis. Then you fix it with the templates, not with restriction.
And if you're doing the training, the fuelling looks right, and the results still aren't coming — weight, power or both — something else in the system is leaking. The Plateau Diagnostic takes three minutes, it's free, and it looks at training, fuelling and recovery as one picture.
The full breakdown of the in-season trap — including why it hits racers hardest — is on this week's episode. And if you want to work through your own numbers with riders who've been through it, that's what the Roadman community is for.