NutritionAnswer

IS FASTED RIDING WORTH IT?

By Anthony WalshRoadman CyclingUpdated 26 May 2026

WHO THIS IS FOR

IS THIS YOU?

The rider who skips breakfast before morning sessions

You ride first thing, often without eating, and want to know whether this is helping or hurting you.

The cyclist chasing fat adaptation

You have heard about fat-burning benefits and are considering a low-carb or fasted training approach.

THE ROADMAN VIEW

The fasted riding romance comes from a genuine metabolic fact — exercising without carbohydrate does shift your body toward fat oxidation. The problem is that the cycling world extrapolated a modest acute effect into a universal training principle, and it does not hold up. Anthony has tested it himself and discussed it with Dr Sam Impey on the podcast — when the sessions that matter get run on empty, they are slower, worse quality, and produce less adaptation than fuelled equivalents.

The practical test is simple: check what your 'fasted' rides actually look like in your training files. Most riders who think they are doing easy fasted training are hovering in zone 3 because they cannot hold zone 2 without carbohydrate. At that intensity, you are not getting the fat-oxidation stimulus you are seeking; you are just doing suboptimal aerobic work on a short fuel supply.

There is a legitimate use case: a short, genuinely easy ride — 60 to 90 minutes, fully conversational, heart rate solidly in zone 2 — done fasted occasionally adds a meaningful metabolic stimulus without wrecking the session. The key word is occasional, easy, and short. It is a specific tool for a specific purpose, not a general training philosophy.

EXPERT EVIDENCE

WHAT THE EXPERTS SAY

Dr Sam ImpeyWorld Tour nutritionist
Fasted training has a place in a well-structured programme — specifically low-intensity, short-duration work where fat oxidation is the target. The error is extending it to hard sessions or long rides where glycogen availability is performance-limiting. Under-fuelling those sessions costs more in adaptation than the metabolic benefit of fasting is worth.
Hear it: Why Pros' 120g Carb Rule Fails Amateurs | Roadman Cycling
Fuelling experiment — under vs optimal vs overRoadman podcast — Anthony's personal fuelling test
When Anthony ran a controlled comparison of under-fuelled, optimally fuelled, and over-fuelled riding, the under-fuelled sessions consistently produced the worst power numbers and felt the worst. The metabolic argument for fasting does not translate into better ride quality or more training adaptation.
Hear it: Under vs Optimal vs Overfueling on the Bike | Roadman Cycling Podcast

PRACTICAL APPLICATION

DO THIS WEEK

Limit fasted riding to easy sessions under 90 minutes
If you want the metabolic stimulus, ride before breakfast on a genuinely easy day — zone 1 to low zone 2, fully conversational. Keep it under 90 minutes. This is the condition where fasted training delivers benefit without the cost.
Fuel every hard session, regardless of timing
Intervals, threshold work, and anything with a power target should always have carbohydrate available. Even a small carb intake — a banana before, a gel during — materially improves session quality and the adaptation it produces.
Test your own 'easy' rides
Pull up a recent fasted ride and check the power and heart rate. If you are consistently in zone 3, you are not riding easy enough to benefit from fasted training. Either lower the intensity or add fuel.

COMMON MISTAKES

WHAT CYCLISTS GET WRONG

MISTAKEUsing fasted sessions for interval or threshold work.
FIXFuel hard sessions fully. The quality of the work produces the adaptation — undercutting it with an empty tank is a false economy.
MISTAKERiding 'easy' fasted but actually drifting into zone 3.
FIXTrue fasted-training benefit requires genuinely easy intensity. If you cannot hold zone 2 without carbs, eat something small and lower the expectation.
MISTAKEFasting through long rides trying to burn more fat.
FIXLong rides are where glycogen depletion actually becomes a performance limiter. Bonking 60km from home is not a training stimulus — it is a miserable, suboptimal session.

FAQ

FREQUENTLY ASKED QUESTIONS

Does fasted riding help with weight loss?

Marginally, if it does not increase compensatory eating later in the day. The total calorie balance over the day matters more than the fasting window. Riders who ride fasted often eat more at breakfast, wiping out any deficit. Focus on overall daily calorie management rather than the fasting mechanism.

Will fasted training improve my fat metabolism?

Periodically, yes — occasional fasted easy rides do shift substrate use toward fat oxidation during low-intensity efforts. But the effect does not translate into better race performance, which requires high-intensity fuelled efforts. You are training one energy system while competing on another.

How long can I ride fasted safely?

For easy, zone 2 riding, most people have enough stored glycogen for 60–90 minutes without meaningful performance loss. Beyond that, power and pacing begin to degrade. Two hours fasted at anything above zone 2 is where bonking risk becomes real.

Should I drink coffee before a fasted ride?

Caffeine is fine and does not materially break the fasted state for training purposes. A black coffee before an easy fasted ride keeps you sharp without providing the carbohydrate that would change the metabolic stimulus.

Is fasted training worse for masters cyclists?

Generally, yes. Older athletes are more sensitive to catabolic conditions and muscle protein breakdown. Fasted sessions in masters riders carry a higher risk of muscle loss alongside fat loss, making the high-protein fuelled approach even more important after 40.

RELATED EPISODES

HEAR THE CONVERSATIONS

Under vs Optimal vs Overfueling on the Bike | Roadman Cycling Podcast

Is training fasted a good idea? Vlog #011

Why Pros' 120g Carb Rule Fails Amateurs | Roadman Cycling