Here is what to do tomorrow, before we go anywhere near the mechanisms of nutrition.

• Eat 1.6-2.2g of protein per kg of bodyweight every day. Spread it across 3-5 meals.
• Build the rest of your plate around the training demand: 3-7g of carbohydrate per kg depending on volume and goal.
• 0.8-1.5g of fat per kg.
• 35-40ml of water per kg plus what you lose in training.
• Eat enough vegetables, fruit and whole-food fibre that you hit 30-40g of fibre a day without counting it.
• Eat real food (single ingredient foods) the vast majority of the time.
• Use creatine monohydrate at 0.1g/Kg daily.
• Sleep 7-9 hours.
• Time caffeine deliberately.

That is roughly 90-95% of what most people need to know about nutrition. The rest of this article fills in the why, the calibration, the periodisation for different goals, and the supplements worth their place. But if you do not read another word, the paragraph above is the working answer for the "help me with my nutrition" question.

The reason the simple picture above works is that the major levers in nutrition are not meant to be hard or unachievable. Total calories, protein, training-supportive carbs and fats, hydration, sleep, and a few cheap supplements with strong evidence behind them.

The athletes who get nutrition right are not following a complicated protocol.

They are running the basics consistently across years. The athletes who chase the latest seed oil debate or the specific peptide their favourite influencer is on are almost always missing the basics.

This article is built for tactical athletes, serving Operators, selection candidates and civilian tactical workers who want a working framework for eating for performance. It covers how to set your calorie target, how to hit the macronutrients that matter, how to time food around training, how to periodise nutrition across different phases of training, the supplements worth taking, and the common mistakes that quietly erode performance over years.

The four principles that drive nutrition for tactical athletes

Before we get into numbers, the four principles below underpin almost everything else.

• Calorie balance drives body composition. Surplus builds, deficit cuts, maintenance maintains. The first decision in any nutrition plan is which of the three you are in, because everything else changes around it.
• Protein drives recovery and lean mass retention. Hitting daily protein at 1.6-2.2g per kg is the single most evidence-backed nutrition intervention for trained athletes. Below 1.6g/kg recovery and lean mass can start to suffer. Above 2.2g/kg you are not getting more for the effort - cause that's a lot of meat to eat...
• Carbohydrate fuels intensity. Tactical performance is heavily anaerobic and aerobic-glycolytic. Carbohydrates are the dominant fuel for moderate-to-high intensity work. Low-carb diets work for some health goals; they do not work well for the work tactical athletes need to do.
• Consistency beats perfection. A reasonable plan executed across years beats a perfect plan executed for six weeks. Nutrition that fits your life is the nutrition that delivers results. Nutrition that requires constant white-knuckled discipline collapses the moment life gets in the way.

Get these four right and the rest is minor calibration. Get them wrong and no amount of supplement stacking or meal timing precision will rescue the picture.

How many calories should a tactical athlete eat?

The first decision is which phase you are in. Your overall calorie target moves with the goal.

Table 1. Daily calorie targets across the four most common phases for tactical athletes. Each is calibrated to bodyweight change over a 2-week window rather than a single weighing.

Two practical points worth flagging.

First, caloric needs scale with training load far more than most people assume. A serving operator on light maintenance training might need 2,800 kcal a day. The same operator three weeks into a pre-selection block with 15+ hours of weekly training might need 4,500 kcal a day (depending on a few things). Under-eating in heavy training phases is one of the most common errors I see in consultations. It produces not only slow or no results but also a slow erosion of recovery, sleep quality, mood, immune function and operational readiness that often gets blamed on overtraining, stress, or just poor genetics.

Second, calorie estimates are starting points. Track for 2-3 weeks at the estimated number, weigh in twice a week under similar conditions, and adjust by 100-200 kcal up or down based on bodyweight movement. Calculators give you a hypothesis. Bodyweight trend confirms or denies it.

How much protein, carbs and fat should you eat?

The macronutrient targets below are calibrated for tactical athletes and trained populations. They sit slightly higher than the recommendations for general population health, because the training stimulus and the operational performance requirement both warrant it.

Table 2. Working macronutrient targets for tactical athletes. Protein is the most non-negotiable. Carbs scale with training load. Fat takes the remainder of calories once protein and carbs are set.

Protein: the non-negotiable

The 1.6-2.2g per kg bodyweight per day target comes from the most-cited meta-analysis on the question (Morton et al. 2018) which examined 49 studies on resistance-trained athletes. Below 1.6g/kg, additional protein continued to improve outcomes. Above 2.2g/kg, the effect plateaued. Phillips and Van Loon's earlier review work supports the same range for athletes broadly.

Distribution matters slightly. Areta and colleagues (2013) showed that splitting daily protein into 4-5 doses of 0.3-0.4g/kg per meal produced better muscle protein synthesis across 24 hours than the same total split into 2 doses. The practical version: aim for 30-50g of protein per meal, 3-5 times a day. Most tactical athletes already do this if they eat structured meals. Skipping breakfast and front-loading protein at dinner is a small but real cost over months.

Carbohydrates: the performance fuel

Tactical performance is heavily glycolytic. Carbohydrate availability directly determines how hard and how long you can perform at moderate-to-high intensities. Low-carb diets and ketogenic approaches have their place for some health and body composition contexts, but they are not the right tool for someone whose job requires repeatable high-intensity output.

Carb intake should track training volume. A lower-volume week (under 6 hours of training) holds well at 3-4g/kg. A heavy week (10-15+ hours) often needs 5-7g/kg. The mistake is keeping carbs static or unmeasured and assuming the deficit or surplus will be small enough to ignore. It rarely is and equates to a loss in performance and recovery.

Fat: structural and hormonal

Fat is essential for hormone synthesis, fat-soluble vitamin absorption and cell membrane function. The lower bound for serious athletes sits around 0.6-0.8g per kg. Below that, testosterone and other steroid hormones drop measurably (Volek et al. 1997; Hamalainen et al. on dietary fat composition). The upper bound is set by what remains after protein and carbs are dialled in.

Composition matters somewhat. Aim for a mix of sources: olive oil, oily fish, nuts, eggs, dairy fat, modest amounts of saturated fat from real food. The seed-oil debates online are overblown (and heavily politicised) for trained athletes eating mostly whole foods; the dose and pattern matter more than the specific source.

How to time nutrition around training

Meal timing matters less than total daily intake. But within a well-fuelled day, timing improves the quality of individual sessions and supports recovery.

Table 3. Practical timing for training-day nutrition. The pre and post windows produce most of the measurable training benefit; intra-training matters above 75 minutes of hard work; pre-bed protein is an optional refinement for build phases.

The anabolic window myth is worth bringing up at this point. The old line that you must consume protein within 30 minutes of finishing training has been substantially weakened  (if not completely destroyed) by subsequent research (Schoenfeld, Aragon & Krieger 2013). The window is meaningfully wider...like a barn door really, usually 2-4 hours either side of training, and the dominant variable is hitting daily protein totals. That said, getting a mixed meal in within 2 hours post-session is usually the convention and easiest scenario that works for most athletes and there is no good reason to delay it.

How to periodise nutrition across different goals

This is where the vast majority of tactical athletes get nutrition wrong. They run the same macro split in every phase regardless of what they are training for. Each phase has its own demand.

Body composition / fat loss

Really depends on whether you are changing your nutrition specifically to drop body weight/fat. Generally, a modest deficit (300-500 kcal). Protein high (2-2.4g/kg in a deficit, slightly above maintenance norms) to preserve lean mass under reduced calorie availability. Carbs flexible, prioritised around training. Fat at the lower bound of the range to leave more carb headroom. Rate of loss: 0.5-1% bodyweight per week. Faster than that and strength loss and recovery debt accelerate.

Maintenance

Calories at maintenance. Macros within the working ranges in Table 2. This is where most serving operators sit most of the year. The goal is reliable operational fitness and durability. Most variation across a year is small and sits within this band.

Build / lean gain

Modest surplus (200-400 kcal). Protein at the upper end (2.0-2.2g/kg). Carbs at the upper end to support volume and recovery. Fat moderate. Rate of gain: 0.25-0.5% bodyweight per week. Faster than this and you build proportionally more fat for the same lean mass gain. Trained athletes can rarely add more than 0.25-0.5 kg of lean mass per month under any conditions.

Selection prep/pre-deployment workup

Slightly above maintenance (+5-15% depending on training load). High protein, very high carbs (often 6-8g/kg) to support training volume. Fat moderate. The aim is fuelling the work and supporting recovery, not body composition change. This is definitely not the time to be cutting weight.

Operational period/deployment

Maintenance or modest surplus depending on tempo. Protein remains 1.6-2.2g/kg if available. Carbohydrate intake can flex with operational tempo. Fat remains stable. The variable that usually breaks first under operational conditions is sleep, not food, so simplicity wins here over precision. Eat real food where you can, supplement gaps with whey or 'protein and high micronutrient' shakes where you cannot.

Which supplements are worth taking?

Most supplement spending is wasted time and money. There are a few supplements that have meaningful evidence behind them for tactical athletes; everything else is either neutral or marginal.

For job security - our advice is to always lean into the informed sport certified brands and you can follow this link to get a discount off of supplements - https://healf.com/STOIC10

Table 4. The supplement landscape for tactical athletes ranked by evidence. Creatine and caffeine sit in Tier 1. A handful of micronutrients and conditional supplements sit in Tier 2. Most other categories sit in Tier 3 or below and rarely justify the cost.

Some practical principles for supplements.

• First, higher quality food before supplements.
• A 5-10g daily creatine dose is worth more and is more beneficial for you than the most expensive pre-workout.
• Whole-food protein sources are usually superior to powders for satiety, micronutrients and gut health.
• Use powders to fill gaps, not as the foundation.

The marketing budget for a supplement is inversely correlated with the strength of evidence behind it. The cheapest, least exciting supplements (creatine, vitamin D, fish oil) tend to have the strongest evidence. The expensive flagship products with the slick branding and proprietary (hidden) blends usually have the weakest.

Hydration: the most under-prioritised variable

Hydration sits in the same category as sleep. Everyone knows it matters. Most tactical athletes are mildly chronically dehydrated and would see immediate performance gains from fixing it.

Baseline target: 35-40ml per kg of bodyweight per day. For an 80kg operator that is around 2.8-3.2 litres of water from drinks, before accounting for food (which contributes around 20-30% of total water intake).

Add 500-1000ml per hour of hard training, depending on sweat rate. For long sessions in heat or with body armour, the requirement climbs higher. Two practical tests: urine should be pale straw colour through the day (clear is over-hydration; dark yellow is under-hydration), and bodyweight before and after a hard session should be within 2% (each 1kg lost is approximately 1 litre of fluid debt to replace).

Electrolytes (sodium particularly) matter when sweat losses are high or training is sustained above 60-90 minutes. The simplest practical version: salt your food, and add an electrolyte tab or pinch of salt to your water bottle during longer or hotter sessions.

What are the common nutrition mistakes for tactical athletes?

Five errors I see across most consultations.

Under-eating in heavy training blocks. The single most damaging mistake. Trying to maintain a low-calorie baseline through a 15-hour training week produces recovery failure, sleep degradation, mood disruption and immune suppression. If the training volume climbs, the calories have to climb with it.

Protein too low because the meals look fine. Most athletes I work with who are chronically under-consuming proteins assume they are at target until they actually track. 1.6g/kg for an 85kg operator is 136g of protein a day. That is around five palm-sized servings of meat, fish or equivalent. Most untracked athletes are below this.

Carbs too low for the training demand. Influenced by social media nutrition trends, many tactical athletes are running low-carb against their best operational interests. The flat sessions, irritable mood, poor sleep and stalled progress are often a carb shortage masquerading as overtraining.

Supplement spending without basics in place. £200 a month on the latest stack while skipping breakfast, sleeping 6 hours and drinking 1 litre of water a day. Fix the foundations first.

Treating nutrition as a sprint instead of a system. Six-week aggressive cuts followed by uncontrolled rebounds. 12-week build phases followed by abandoning structure entirely. Tactical careers run on decades, not training cycles. Build a nutrition framework that holds across years.

Bottom line

Tactical nutrition is largely a discipline of consistency on a few high-leverage variables, not a chase across exotic protocols or the latest fad that a shirtless influencer is telling you about.

Five principles to take away:

• Hit 1.6-2.2g per kg of protein every day. Spread across 3-5 meals. The single most evidence-backed nutrition intervention available.
• Calibrate calories to phase. Cut, maintain, build, fuel. Each has a different target. Run the wrong one for the goal and the goal will not happen.
• Carbs scale with training load. Heavy weeks need heavy carbs. Light weeks can drop. Static macros across all phases is the most common error.
• Hydrate, sleep, take creatine. Three of the highest-leverage interventions in the entire nutrition and recovery picture. Cheap, well-evidenced, often neglected.
• Build a system you can hold across years. Tactical careers run on decades. A reasonable plan executed consistently beats a perfect plan executed for six weeks.

Eat for the job. Calibrate your nutrition to the phase. Run the basics consistently. Most of the rest is noise you can safely ignore.

Nutrition for tactical athletes: frequently asked questions

How much protein do I need as a tactical athlete?

1.6 to 2.2g per kg of bodyweight per day, split across 3-5 meals of 30-50g each. This is the range that consistently produces the best lean mass retention and recovery in trained athletes (Morton et al. 2018 meta-analysis). Below 1.6g/kg you leave performance on the table. Above 2.2g/kg the returns plateau.

Should I eat low carb if I'm training for selection?

No. Tactical performance is heavily glycolytic and selection courses demand repeatable high-intensity output over multiple days. Low-carb and ketogenic approaches impair this kind of work even after months of adaptation. Carbs should sit at 5-7g per kg of bodyweight during heavy training blocks, with the upper end of that range during selection prep itself.

Do I need a pre-workout supplement?

Probably not. The active ingredient in most pre-workouts that produces measurable benefit is caffeine, which costs pennies and can be taken on its own. Beta-alanine has narrow application for repeat high-intensity work. Most other pre-workout ingredients (citrulline, beetroot, etc.) show small effects in specific contexts but rarely justify the cost. A coffee and a small carb hit pre-training produces most of what a pre-workout provides.

How do I know my calorie target?

Three steps. Estimate maintenance using a calculator (bodyweight in kg x 30-35 for moderate activity, 35-40 for heavy training). Track at that number for 2-3 weeks while weighing in twice weekly. Adjust by 100-200 kcal up or down based on actual bodyweight movement. The calculator is a hypothesis; the scale is the test.

What about intermittent fasting for tactical athletes?

Workable for body composition if it suits your schedule, but rarely the optimal strategy for performance. Compressing meals into a short window often makes hitting protein and carbohydrate targets harder around training. The data on time-restricted feeding for body composition is largely equivalent to calorie matching at other windows. If fasting fits your life, run it. If not, do not chase it.

Is creatine safe for tactical athletes long term?

Yes. Creatine monohydrate is one of the most-studied supplements in sport, with decades of safety data including in tactical and military populations. 5g daily is the standard maintenance dose. 0.3g per kg per day split into 4-6 doses is the loading protocol used for events where cognitive and physical performance under sleep deprivation matters. There is no evidence of meaningful long-term safety concerns in healthy populations.

Should I eat differently as a serving operator versus a selection candidate?

Mostly the same principles, different calibrations. Selection candidates typically run in surplus during build phases to support 12+ hours of weekly training. Serving operators in steady-state roles run closer to maintenance and shift to surplus during operational periods or workups. The protein, carbohydrate and hydration principles hold across both.

What's the best way to lose body fat while staying strong?

Modest deficit (300-500 kcal), high protein (2.0-2.4g/kg), maintain training intensity, lose 0.5-1% of bodyweight per week. Faster than this and strength loss accelerates. Slower and progress feels frustrating but is more durable. Two-to-three months is a reasonable window for a meaningful cut without losing the strength you built getting there.

What about cheat meals or refeeds?

In a maintenance phase, normal social eating fits within total weekly calories without problem. In a deficit, planned higher-carb refeeds (1-2 per week) can support training quality and hormonal markers (specifically leptin) over longer cuts. The unstructured 'cheat day' chaotic-binge culture is rarely useful. Structured refeeds at scheduled times work; uncontrolled blowouts undo the week's deficit and damage the relationship with food.

How important is meal timing really?

Less important than total daily intake but not nothing. Hitting protein in 3-5 doses through the day produces marginally better muscle protein synthesis than 1-2 large doses. A pre and post-training meal supports recovery and performance reliably. Beyond that, exact timing matters less than the marketing industry suggests. The 30-minute anabolic window is broadly debunked (Schoenfeld, Aragon & Krieger 2013). Aim for a meal within 2 hours of training; do not stress if life pushes it longer.

References

Morton, R. W., Murphy, K. T., McKellar, S. R. et al. (2018). A systematic review, meta-analysis and meta-regression of the effect of protein supplementation on resistance training-induced gains in muscle mass and strength in healthy adults. British Journal of Sports Medicine, 52(6), 376-384.

Phillips, S. M., & Van Loon, L. J. C. (2011). Dietary protein for athletes: from requirements to optimum adaptation. Journal of Sports Sciences, 29(sup1), S29-S38.

Areta, J. L., Burke, L. M., Ross, M. L. et al. (2013). Timing and distribution of protein ingestion during prolonged recovery from resistance exercise alters myofibrillar protein synthesis. Journal of Physiology, 591(9), 2319-2331.

Schoenfeld, B. J., Aragon, A. A., & Krieger, J. W. (2013). The effect of protein timing on muscle strength and hypertrophy: a meta-analysis. Journal of the International Society of Sports Nutrition, 10(1), 53.

Trommelen, J., & Van Loon, L. J. C. (2016). Pre-sleep protein ingestion to improve the skeletal muscle adaptive response to exercise training. Nutrients, 8(12), 763.

Helms, E. R., Aragon, A. A., & Fitschen, P. J. (2014). Evidence-based recommendations for natural bodybuilding contest preparation: nutrition and supplementation. Journal of the International Society of Sports Nutrition, 11(1), 20.

Iraki, J., Fitschen, P., Espinar, S., & Helms, E. (2019). Nutrition recommendations for bodybuilders in the off-season: a narrative review. Sports, 7(7), 154.

Volek, J. S., Kraemer, W. J., Bush, J. A., Incledon, T., & Boetes, M. (1997). Testosterone and cortisol in relationship to dietary nutrients and resistance exercise. Journal of Applied Physiology, 82(1), 49-54.

Kerksick, C. M., Wilborn, C. D., Roberts, M. D. et al. (2018). ISSN exercise & sports nutrition review update: research & recommendations. Journal of the International Society of Sports Nutrition, 15(1), 38.

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