For a short, easy run, eat almost nothing different. For a long one, the lever that matters is carbohydrate, timed to the run and scaled to its length: a banana before a 30-minute jog, but 30 to 60g of carbs an hour during anything past about 70 minutes. The night-before carb-load only helps when the next day's effort is genuinely long, and the protein shake you down afterwards is doing far less for "muscle building" than the marketing suggests. Here's what the evidence actually says, in food you can buy at any Singapore kopitiam or supermarket.
The myth: carb-load Friday, run fasted Saturday on willpower
This is two bad ideas stacked on top of each other. The night-before carb-load is real science, but it's specific: topping up muscle glycogen makes a difference for prolonged, glycogen-depleting efforts. The International Society of Sports Nutrition's position stand puts daily carbohydrate for serious endurance training at 5 to 12g per kg of body weight a day, with the upper end reserved for athletes training at moderate-to-high intensity upwards of 12 hours a week. A 70kg recreational runner doing a 5k three mornings a week is nowhere near needing a plate of pasta to "load". You'll just be heavier off the line.
Then there's the fasted run, sold as a fat-burning hack or a test of discipline. Training with low carbohydrate availability does trigger some useful cellular signals, but a systematic review and meta-analysis in the Journal of the International Society of Sports Nutrition found that periodised carbohydrate restriction was not superior to a normal high-carbohydrate diet for endurance performance. Seven of nine studies showed no performance benefit, and the reviewers flagged a real drawback: compromised training quality, especially lower intensity on the hard intervals. Fasted easy runs are fine if you feel fine. Running hard or long on an empty tank mostly buys you a worse session.
What to eat before a run, by distance
The honest answer is that pre-run food scales with how long and hard you're going. Singapore's Health Promotion Board, via HealthHub, keeps it simple: eat a meal that's mainly carbohydrate with some protein one to two hours before, or wait three to four hours after a large meal so you're not running on a full stomach.
For a short, easy run under 45 minutes or so, you genuinely don't need much. Your muscles already hold enough glycogen. A banana, a slice of kaya toast, or just a teh-O if your stomach is fussy at 6am is plenty. The teh-O does double duty here: a little caffeine before a humid morning run is one of the better-supported performance aids going, and the sugar is a small, fast top-up. If you've eaten dinner the night before, you can run a 5k on that alone.
For a longer or harder run, give yourself something more substantial one to two hours out and lead with carbs. Two slices of wholemeal bread, oats with low-fat milk, or kaya toast with a soft-boiled egg all fit HealthHub's "mainly carbohydrate, some protein" template. Keep it low in fat and fibre so it clears your stomach in time. This is the same principle behind easing into running with a couch-to-5k plan: the food, like the training, should match where you actually are, not where the marathon crowd is.
During the run: only past about 70 minutes
For most Singapore runners most of the time, the answer to "what should I eat during the run" is nothing. You're not out long enough to run the tank dry.
It changes once you're past roughly 70 minutes of sustained effort. The ISSN position stand recommends consuming around 30 to 60g of carbohydrate per hour during extended high-intensity bouts, ideally as a dilute carbohydrate-electrolyte solution. That's where the "banana for a 5k is not the same job as 75g of carbs for a 90-minute long run" line lands: the longer effort needs fuel going in while you move, not just before. A banana is about 25g of carbs, so on a long run you'd be eating one every half hour or so, or using a sports drink, or both. HealthHub says the same thing in plainer terms: water alone for sessions of 30 to 60 minutes, water plus a light snack like raisins or a banana once you go past an hour, and sports drinks only for high-intensity efforts over an hour.
In Singapore's heat and humidity, the fluid and electrolyte side of this matters as much as the carbs. If you're running long in the morning sun, you'll lose a lot through sweat, which is its own hydration question worth getting right, and part of why heat adaptation deserves its own attention here.
After the run: the protein-shake habit, examined
Here's where the popular script is most wrong. The reflex move is a protein shake the moment you stop, on the belief that you're "building muscle" in a closing window. For recovery from a run, the bigger job is usually refilling glycogen, and that job is carbohydrate's, not protein's.
The ISSN guidance is to take in 0.6 to 1.0g of carbohydrate per kg of body weight within the first 30 minutes after a glycogen-depleting run, then again every couple of hours. And the question of whether adding protein speeds that up has a clear answer: a 2021 systematic review and meta-analysis in Sports Medicine - Open, pooling 29 trials, found that co-ingesting protein with carbohydrate "does not appear to enhance the rate of muscle glycogen re-synthesis, nor is it detrimental". So if your only goal after a run is restocking energy, the carbs do the work and the protein is along for the ride.
Protein still earns its place, just for a different reason: repairing the muscle you've worked, not topping up fuel. The ISSN position stand suggests a 20 to 40g dose of quality protein (roughly 0.25 to 0.40g per kg per dose) to maximally stimulate muscle protein synthesis, repeated every three to four hours through the day. Note what that means: it's about your total daily protein spread across meals, not one frantic shake. A shake is a convenient way to hit one of those doses. It is not a magic post-run window.
The good news for Singapore runners is that the ideal recovery meal is already on every hawker menu. Chicken rice gives you the carbs from the rice and the protein from the chicken in one plate. Wholemeal prata with a side of dhal, fish soup with rice, or a chicken biryani all do the same double job. HealthHub's own examples run the same way: grilled lean chicken with vegetables, or tandoori chicken with chapatis, eaten within an hour of finishing. If you'd rather cook, the principle behind a quick high-protein meal you can make in under 30 minutes is exactly what a recovery plate wants: protein plus carbs, minimal fuss.
A note on who this is for
This is general information, not medical advice. See a clinician or an accredited dietitian before making big changes to how you eat around training if you have diabetes, take medication that affects blood sugar, are pregnant, or have a history of disordered eating. Fuelling strategies that suit a healthy recreational runner are not one-size-fits-all, and "eat more carbs around your runs" is the wrong message for some people. The numbers above come from research on healthy, training adults and are a starting point, not a prescription.
FAQ
Do I need to carb-load before a 5K?
No. A short easy run under 45 minutes needs little beyond normal meals. Your muscles already hold enough glycogen for routine sessions.
What should I eat before a morning run in Singapore?
For easy runs, a banana, kaya toast or teh-O is plenty. For longer efforts, eat mainly carbohydrate with some protein one to two hours before.
When do I need fuel during a run?
Past roughly 70 minutes of sustained effort. Aim for about 30 to 60 g of carbohydrate per hour via sports drink, gels or fruit.
How important is post-run protein?
Useful for recovery, but the marketing oversells it. Total daily protein and timing across meals matter more than a single shake immediately after an easy 5K.
Should I do fasted runs for fat loss?
Fasted easy runs are fine if you feel fine, but fasted hard or long sessions often compromise training quality without clear performance benefit.
Sources
- International Society of Sports Nutrition position stand: nutrient timing (Kerksick et al., Journal of the International Society of Sports Nutrition, 2017)
- The Effect of Consuming Carbohydrate With and Without Protein on the Rate of Muscle Glycogen Re-synthesis During Short-Term Post-exercise Recovery: a Systematic Review and Meta-analysis (Craven et al., Sports Medicine - Open, 2021)
- Performance effects of periodised carbohydrate restriction in endurance trained athletes: a systematic review and meta-analysis (Journal of the International Society of Sports Nutrition, 2021)
- What to Eat Before and After a Workout (Singapore Health Promotion Board, HealthHub)
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