RPE-aligned eating means adjusting your portions to how hard your day actually was, using your rating of perceived exertion (RPE), rather than following the same meal plan whether you trained hard, went for a gentle walk or skipped your workout. You keep a steady base of balanced meals every day and add a little more carbohydrate and food on genuinely hard days. It is a simple way to fuel training without overeating on rest days or undereating on demanding ones.
What RPE is
RPE is a self-rating of how hard exercise feels. The most common modern version runs from 0 (rest) to 10 (maximal effort). An older scale developed by Gunnar Borg runs from 6 to 20. Both ask the same thing: how hard is this for you, right now?
Mayo Clinic describes exercise intensity as a subjective measure of how hard physical activity feels to you while you’re doing it. At a moderate intensity you can talk but not sing; at a vigorous intensity you cannot say more than a few words without pausing for breath.
RPE captures things a heart rate monitor misses: poor sleep, heat, stress or a long workday can make the same session feel harder. That is useful for eating too, because those days often need more fuel and recovery.
A simple effort scale for eating
Rate your whole day’s activity, not just one set, after the fact. Then match it to a fuel level.
| Day effort (RPE) | What it looks like | Fuel level |
|---|---|---|
| Low (0–3) | Rest day, easy walk, stretching, mostly sitting | Base plates |
| Moderate (4–6) | 45–60 minutes of steady cardio or a normal strength session | Base plates plus a bit more carbohydrate at the meal after training, or a snack |
| Hard (7–8) | Intervals, heavy lifting, long run or ride, a long hike | Base plates, a pre-training snack, and a larger carbohydrate and protein portion afterward |
| Very hard (9–10) | Races, very long events, two sessions in a day | As above, plus fuel during the activity and an extra snack |
Most people spend most days at low or moderate. Be honest: a busy day on your feet may feel tiring without being a hard training day.
Build your base plate first
Your base is what you eat on a low-effort day. Canada’s Food Guide plate is a good starting point: half vegetables and fruits, a quarter whole grain foods and a quarter protein foods. Keep protein steady every day, since muscles repair on rest days too. See our guide to protein pacing for ways to spread it across meals.
How to adjust portions by effort
The main thing that changes with effort is carbohydrate, because it is your muscles’ main fuel for harder work. The joint position of the Academy of Nutrition and Dietetics, Dietitians of Canada and the American College of Sports Medicine says performance and recovery are enhanced by well-chosen nutrition strategies, including the type, amount and timing of food and fluids, tailored to different training scenarios.
Use hand-sized portions instead of weighing food:
- Low day: about a fist of carbohydrate (rice, potatoes, pasta, oats, bread, beans or fruit) at main meals, plenty of vegetables, a palm or two of protein.
- Moderate day: add about half a fist more carbohydrate to the meal after training, or have a snack such as yogurt and fruit.
- Hard day: add a pre-training snack (banana, toast, a few dates) and make the post-training meal about one and a half to two fists of carbohydrate, with protein.
- Very hard day: add carbohydrate during long sessions (a banana, dried fruit or a sports drink) and an extra snack later in the day.
Then let hunger fine-tune it. If you are still hungry an hour after a hard-day meal, add a snack. If you are not hungry on a low day, a smaller portion is fine.
Eat for the day you actually had
Plans change. A planned long run becomes a short walk; a rest day turns into helping a friend move. RPE-aligned eating handles this simply:
- Workout cancelled? Return to base plates. No need to make up for the snack you already ate.
- Unexpectedly hard day? Add carbohydrate and protein at the next meal.
- Sick? Eat what you can tolerate, drink fluids and rest; this is not the time to cut back.
- Tomorrow is the hard day? Make sure dinner tonight includes a regular carbohydrate portion and breakfast is not skipped.
Sample day at each level
Low effort
Breakfast: eggs, whole grain toast, tomatoes. Lunch: big lentil salad. Dinner: tofu or fish, a fist of rice, two vegetables. Snack if hungry: Greek yogurt.
Moderate effort (after-work strength session)
Same base, plus a banana and milk after training, and a slightly larger rice portion at dinner.
Hard effort (morning intervals)
Pre-training: toast with peanut butter and honey. Breakfast after: oats with milk, fruit and yogurt. Lunch and dinner as usual with a bit more carbohydrate. Afternoon snack: hummus, crackers and vegetables.
Tracking without obsessing
A one-line daily note works: effort rating, energy (low, normal, high), sleep quality, and how training felt. After a few weeks, look for patterns. If hard sessions feel flat, you may need more fuel the day before. If you are steadily gaining weight you did not want, look at whether “hard day” portions are creeping into low days. If you weigh yourself, look at weekly trends rather than daily numbers, since water shifts after hard training are normal.
This approach should never turn into “earning” food. Base plates are for every day, no matter what. If eating is starting to feel like a reward or punishment for exercise, talk to your healthcare provider; NEDIC (nedic.ca) offers support in Canada. Rest is part of training too; see our article on recovery days.
When to check with a professional
See a doctor or sports dietitian if you have ongoing fatigue, frequent injuries, missed periods, dizziness during exercise, or if you have diabetes and want to adjust carbohydrate around training. A registered dietitian can turn these ranges into a personal plan for performance or weight goals.
Takeaways
- Rate your day’s effort from 0 to 10 and match fuel to it.
- Keep base plates and protein steady every day.
- Change mainly carbohydrate: a bit more on moderate days, noticeably more around hard sessions.
- Eat for the day you actually had, not the one you planned.
- Food is never earned; base plates are for every day.
FAQ
Can RPE-aligned eating help with weight loss?
It can help by preventing big portions on low-activity days while still fuelling hard sessions. Steady habits over weeks matter more than any single day.
How do I get better at rating RPE?
Use the talk test: easy if you can chat, moderate if you can talk but not sing, hard if you can only say a few words. Rate right after your session and again at the end of the day.