Training And Rest Days
How to match your food to your training week
One of the quickest wins with nutrition isn’t changing what you eat – it’s changing when and how much you eat based on what the week actually looks like.
Most athletes fall into one of two camps:
Eat roughly the same way every day, regardless of training load.
Go all-in on “being good” on rest days and accidentally under-fuel the heavy days.
Neither is a disaster, but both leave performance (and sanity) on the table. This guide is about smoothing that out so your food quietly supports the plan, instead of working against it.
Not every day is equal
Look at a typical training week and it’s obvious: a long run or long ride is not the same as a 30-minute easy jog or a complete rest day. Your body knows that. Your appetite usually does too – although life, stress and habit can drown that signal out.
So rather than trying to eat “perfectly” all the time, it makes more sense to ask one simple question:
“What are my big days, my medium days, and my light days?”
Big days are your long sessions, hard interval blocks, key bricks – anything that leaves you properly worked. Medium days might be solid, moderate efforts or double days where each session is shorter. Light days are easy runs, recovery spins, technique sessions or full rest.
Once you’ve got that picture in your head, you can start nudging food up or down to match.
The plate that flexes with the plan
We’ll stick with the same SPC plate idea from the foundations guide, because there’s no point reinventing the wheel.
On a big training day, think:
Plenty of carbs to fuel and refill
Steady protein to repair
Veg and fruit to keep you vaguely healthy
In practice, that usually looks like:
A visible portion of carbs at most meals (and sometimes an extra carb-based snack around sessions).
Protein staying fairly consistent – you don’t really down-regulate protein on rest days – it’s carbs that move the most.
Veg and fruit popping up on the plate regardless of the day.
Rather than weighing or tracking, think about portion shape. For a big day, carb portions get a little more generous. For a light or rest day, everything shrinks slightly, particularly the carbs, but the overall structure stays the same.
The point is that your body can see from your plate what kind of day you’re having, without you needing to do mental maths every time you eat.
Big days: giving yourself permission to fuel them
A lot of athletes treat long-run or long-ride day as some kind of test of character: “How far can I go on nothing but a coffee and a protein bar?” That’s not training; that’s suffer-festing.
On big days, you’re allowed – and encouraged – to eat more. In fact, that’s the job.
If you’ve got a long run or ride in the morning, that might mean a solid carb-based breakfast and a proper pre-bed meal the night before. If it’s later in the day, you’re looking at decent carbs at lunch and a sensible snack in the afternoon. After the session, you don’t nibble a lettuce leaf and call it recovery; you have a meal that actually looks like it could rebuild something.
When you consistently under-fuel your big days, a few things usually happen:
The session itself feels harder than it needs to.
You finish ravenous and spend the evening hoovering up anything that isn’t nailed down.
The next day’s training quality drops because you’re still in a hole.
When you match food to the work, the long sessions stop feeling like all-out survival missions. You still get tired – that’s the point – but you’re tired from the training, not from running your energy budget into the ground.
Medium days: the quiet middle ground
Medium days are where most weeks either work or don’t. These are your tempo runs, solid rides, or days with a short session and some strength work. They still matter, but they don’t chew through energy like a 3-hour ride or long brick.
Here, you’re not trying to eat like it’s Christmas, but you’re also not on a monk-like ration. Carb portions at meals are sensible rather than huge, and you may or may not need a specific pre-session snack depending on timing and intensity.
If you’ve had a genuinely big day before, medium days can also act as a “catch-up and settle” point: you still eat well, but you’re not throwing extra fuel on top of an already topped-up tank. Think comfortable, not stingy.
Rest days: less drama, more consistency
Rest days get massively overcomplicated. People swing between “cheat day, eat everything” and “I must barely eat because I’m not training”.
The reality is much calmer. You still need:
Protein to repair and maintain muscle
Veg and fruit so your body doesn’t give up on you
Enough overall energy that recovery actually happens
The main thing that changes is carb demand. You’re not burning through as much, so portions can shrink a bit. That might look like a smaller spoon of rice, half a jacket potato instead of a whole one, or skipping the extra side of garlic bread you’d happily have on a long-ride day.
What you don’t need to do is strip carbs right back to almost nothing and white-knuckle your way through the day. If rest days leave you constantly thinking about food, you’ve probably over-corrected.
A nice mental reframe is:
“Rest days are when my body cashes in the training I’ve done.”
You’re still an athlete on those days; you’re just not putting a session on top.
Where snacks fit in
Snacks are where a lot of people accidentally erase the difference between training and rest days. If your meals are well balanced but you snack the same way whether you’ve just ridden 3 hours or watched three episodes of something on Netflix, it’s easy for energy in and out to drift.
On big days, snacks can do some heavy lifting – a banana and yoghurt before a run, toast with peanut butter mid-morning, a cereal bar in the afternoon. On rest days, you might swap some of those out for lighter options or simply snack less often, especially in the evening when “I’m tired” and “I’m hungry” feel suspiciously similar.
You don’t need a strict rule; just an awareness that snacks are another lever you can nudge up or down based on the training.
A week in real life
To make this less theoretical, imagine a simple triathlete week:
Tuesday: harder bike plus short run off the bike
Thursday: tempo run
Saturday: long ride
Sunday: long run
The rest: easier bits, strength, or rest
Tuesday, Saturday and Sunday are your higher-fuel days. Plates on those days feature clear carb portions before and after key sessions, and you’re not shy about a snack or two. Thursday sits in the middle: you fuel the tempo run properly but don’t need quite as much around it. The remaining days are lighter – same protein, same veg, slightly gentler on the carbs, fewer auto-pilot snacks.
Nothing is “off limits”. You’re just giving your body a clear message: this is a big day, this is a medium one, this is when we back off a bit.
The real win: less guilt, more intention
Matching food to training days isn’t about making your life more rigid. It’s actually the opposite. Instead of constantly feeling like you’ve eaten the “wrong” thing, you start to see your choices in context.
A bigger dinner on long-run day doesn’t feel like overeating; it feels like paying your body back. A slightly lighter rest-day lunch doesn’t feel like punishment; it’s just recognising that today’s energy spend is lower.
Over time, that kind of calm, intentional approach beats any short-term “diet” you could jump on. You’re still allowed pizza on a rest day. You’re still allowed cake after a ride. You’re just more aware of the rhythm of the week and what helps you feel and perform at your best.