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Eating for Your Sport: A Practical Macro Guide for Athletes

Almost all mainstream nutrition advice was written for people who do not train. You are not the customer it had in mind.

By Sedric Louissaint, professional MMA fighter, cybersecurity consultant & founder of iVenza • September 8, 2026 • 8 min read
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Nutrition Weight cutting Health & recovery
Illustration of a divided plate with a fork and a rising energy curve

Walk into any nutrition conversation and you will find advice built for a sedentary adult trying to lose fifteen pounds. Cut carbs. Eat less. Fast in the morning. Some of it is fine for that person. Applied to someone doing nine hard sessions a week, it produces an athlete who is tired, injured, and confused about why they got worse.

Athletes have a different problem. You are not trying to eat less. You are trying to fuel a specific workload, recover from it, and often hit a weight while doing both.

Not medical or dietetic advice. The ranges below are general guidance from sports nutrition literature. Individual needs vary with age, sex, training load, health conditions, and medication. For anything involving a medical condition, disordered eating, or an aggressive weight change, work with a registered dietitian or your physician.

Total energy comes first, ratios come second

The internet argues about ratios because ratios are interesting. In practice, if you are under-eating for your workload, no macro split will save you, and if you are eating roughly the right amount of roughly the right things, small ratio changes matter far less than people claim.

Signs you are under-fueling are boring and easy to miss: a heavy warm-up that used to feel fine, strength that stalls despite good programming, disturbed sleep, poor mood, persistent low-grade niggles, and in many athletes a resting heart rate that drifts up. Under-fueling gets misread as overtraining constantly. They look identical from the inside and one of them is much easier to fix.

Protein: the number most athletes actually get wrong

Sports nutrition research generally lands in the range of roughly 1.6 to 2.2 grams per kilogram of bodyweight per day for athletes in hard training, with the upper end being useful when you are in a calorie deficit and trying to keep muscle. In pounds, that is roughly 0.7 to 1.0 gram per pound.

Two practical points. Distribution beats total obsession: three or four meals of twenty-five to forty grams each does more than the same protein crammed into dinner. And this is the macro where most athletes are genuinely short. If you only fix one thing in your eating, fix protein, because it is the one that protects muscle when training is hard and food is limited.

Carbohydrate: it scales with what you are actually doing

Carbohydrate is the fuel for anything intense. Not moderate steady work, where fat does plenty of the job, but the sprints, the rounds, the heavy sets, the fourth quarter. Glycogen is what runs out, and when it does you do not gently slow down, you fall off a cliff.

Which means carbohydrate should not be a fixed number. It should move with your week. A day with two hard sessions needs meaningfully more than a rest day, and athletes who eat identically all week are either over-fed on Sunday or under-fueled on Wednesday.

The single most common self-inflicted wound in athlete nutrition is a low-carbohydrate approach paired with high-intensity training. It feels disciplined. It reliably makes the hard sessions worse, which is where the actual adaptation was supposed to come from.

Fat: set a floor, then let it fill the gap

Fat matters for hormone production, joint health, and absorbing several vitamins, so do not drive it to zero even in a cut. A common working floor is around 0.5 to 0.8 grams per kilogram of bodyweight. Beyond that floor, fat is largely the flexible remainder once protein and carbohydrate are set.

Timing: less important than you have been told, with two exceptions

The famous thirty-minute anabolic window turned out to be much wider than the supplement industry implied. Daily totals do most of the work. There are two situations where timing genuinely matters:

  • Around hard sessions. Carbohydrate one to three hours before, something with protein and carbohydrate after. This matters more the more often you train, and it matters enormously when you have two sessions in a day.
  • When you are making weight. Here timing is the whole game, particularly in the final week.

Weight-class sports: the work happens months before

If you compete in a weight class, the most valuable thing you can do has nothing to do with fight week. It is knowing, from actual recorded data rather than memory, what you weigh across a normal month, what your weight does after a rest day, and what your realistic walking-around weight is when you are eating properly.

Athletes who track weight and eating year-round arrive at camp needing to lose a manageable amount and spend camp training. Athletes who do not arrive needing to lose far too much, spend camp thinking about food, and compete depleted. The difference was decided in the off-season, quietly, months earlier.

iVenza logs food without making it a project. Scan a barcode, photograph a plate to estimate its macros, or describe the meal in a sentence. Weigh-ins, hydration, and macros sit next to your training, so you can see fueling against workload instead of guessing, and a competition weight glide path tells you whether the cut is on schedule. Start free.

Track for three weeks, not forever

Here is the honest position on tracking. Weighing and logging everything permanently is unnecessary for most athletes and, for some, actively harmful. But almost nobody can accurately estimate their intake without ever having measured it. Most people underestimate what they eat by a wide margin, and athletes trying to gain frequently overestimate.

So use tracking as a calibration exercise. Log honestly for two or three weeks, including the weekend, which is where the story usually is. Learn what your normal portions actually contain. Then move to anchors instead of arithmetic: a protein source at every meal, carbohydrate scaled to the day's training, vegetables at two meals, a repeatable breakfast, and a plan for the two or three meals a week that are genuinely unpredictable.

Come back to full tracking when something changes: a camp, a weight class, a plateau, an injury layoff. That is a tool you pick up and put down, not a lifestyle.

Hydration, briefly

Chronic mild dehydration is common and boring and it costs you performance and concentration. Urine color is a decent daily proxy. Sweat rate varies enormously between people and climates, so if you train hard in heat, weigh yourself before and after a session once or twice - the difference is mostly fluid, and it will probably surprise you. Sodium matters alongside water for heavy sweaters, and matters a great deal during rehydration after a weigh-in.

Real life, restaurants, and not being difficult

A plan you can only follow at home is a plan you will abandon. Learn to estimate a restaurant meal roughly rather than avoiding restaurants. Keep two or three default orders you know work. Accept that a handful of meals a week will be approximations, and that consistency across a month beats precision across a Tuesday. The athletes who last are the ones whose eating is boring, repeatable, and socially survivable.

FAQ

How much protein does an athlete need?
Sports nutrition research generally supports roughly 1.6 to 2.2 grams per kilogram of bodyweight per day for athletes in hard training, which is about 0.7 to 1.0 gram per pound, with the higher end useful during a calorie deficit. Spreading it across three or four meals of twenty-five to forty grams tends to work better than concentrating it in one. Individual needs vary, so treat this as a starting range.
Do I need to count macros to eat well as an athlete?
Not permanently. Track honestly for two or three weeks, weekends included, to calibrate what your normal portions actually contain, because most people estimate badly in one direction or the other. Then switch to anchors - protein at every meal, carbohydrate scaled to the day, vegetables twice - and return to full tracking when something changes, like a camp or a weight class.
What should I eat before training?
Carbohydrate one to three hours beforehand, with the amount and timing depending on how much your stomach tolerates. Something with protein and carbohydrate afterwards helps, and matters most when you train more than once a day or on consecutive hard days. Daily totals do more work than precise timing for most athletes, but around hard sessions timing is genuinely useful.
How should I eat during a weight cut?
The real answer is that most of the work happens months earlier: knowing your true walking-around weight from recorded data means arriving at camp with a manageable amount to lose. During a cut, protein usually goes to the top of its range to protect muscle, carbohydrate is scaled to training rather than eliminated, and fat sits at a floor rather than zero. Aggressive cuts should involve a dietitian or physician.

How this works in iVenza: Logging food & macros →