Nutrition Basics for Training

Calories & Energy Balance

Weight change is governed by energy balance. Eat more calories than you burn and you gain weight. Eat fewer and you lose weight. This is thermodynamics, not opinion. It's not the whole picture — hormones, gut health, and genetics influence where energy goes and how you feel — but the energy balance equation is the foundation everything else sits on.

Your Total Daily Energy Expenditure (TDEE) is the sum of four components:

• BMR (Basal Metabolic Rate): The calories your body burns just keeping you alive — breathing, circulating blood, maintaining body temperature. This accounts for 60–70% of total expenditure for most people.
• NEAT (Non-Exercise Activity Thermogenesis): Everything you do that isn't formal exercise — walking, fidgeting, standing, doing chores. This is highly variable between individuals and is the biggest wildcard in energy expenditure.
• TEF (Thermic Effect of Food): The energy cost of digesting food. Protein has the highest thermic effect (~20–30% of its calories are burned during digestion), followed by carbs (~5–10%), then fats (~0–3%).
• Exercise: The calories burned during deliberate physical activity. Most people overestimate this significantly. A hard 60-minute strength session burns roughly 200–400 calories — less than a single large meal.

Layne Norton (BioLayne) has written and spoken extensively about metabolic adaptation and energy balance. One of his key points: your body doesn't passively burn a fixed number of calories. When you diet, NEAT drops, TEF drops (because you're eating less), and hormonal changes reduce BMR slightly. This metabolic adaptation is real and means that prolonged deficits become less effective over time. It's not "starvation mode" in the dramatic way social media portrays it, but it is a measurable reduction in expenditure that you need to account for.

Macronutrients

Calories determine whether you gain or lose weight. Macronutrients determine what that weight is made of and how you perform.

Protein

Protein is the most important macronutrient for anyone who trains. It provides the amino acids your body uses to repair and build muscle tissue after training. Target 1.6–2.2g per kg of bodyweight per day. This range is well-supported by meta-analyses (notably the 2018 Morton et al. review in the British Journal of Sports Medicine). Going above 2.2g/kg shows diminishing returns for muscle protein synthesis — it won't hurt you, but the additional benefit is minimal.

Space your protein across 3–5 meals throughout the day. Each meal should contain at least 20–40g of protein to maximally stimulate muscle protein synthesis (MPS). Eating 150g of protein in one meal and nothing for the rest of the day is suboptimal compared to distributing it evenly. The per-meal MPS threshold varies by body size — larger individuals benefit from the higher end of that range.

For the training side of the muscle-building equation — volume, rep ranges, and exercise selection — see the hypertrophy fundamentals guide.

Carbohydrates

Carbohydrates are the primary fuel for high-intensity training. Glycogen (stored carbohydrate in muscles and liver) powers your heavy sets, your sprints, and your interval work. If you train hard and restrict carbs severely, your performance will suffer — you'll feel flat, weak, and unable to sustain intensity. Don't fear carbs if you're training hard. They are not the enemy; excess calories are.

For most trainees, 3–6g of carbohydrates per kg bodyweight per day is a reasonable range. The lower end suits lighter training loads or fat loss phases; the higher end suits high-volume or endurance training. Prioritize complex sources — rice, potatoes, oats, fruit, legumes — but simple carbs around training (fast-digesting sugars pre or post-workout) are fine and can actually help performance.

Fats

Dietary fat is essential for hormone production (including testosterone), cell membrane integrity, and absorption of fat-soluble vitamins (A, D, E, K). You need a minimum of roughly 0.5g/kg/day to support these functions. Going much below that for extended periods can impair hormonal health, particularly in men.

Beyond the minimum, the split between additional carbs and fats is largely personal preference. Some people feel and perform better with higher carbs and moderate fats; others prefer higher fats and moderate carbs. As long as protein and minimum fat thresholds are met, fill remaining calories however you prefer. Dr. Mike Israetel at Renaissance Periodization and BowtiedOx have both covered practical approaches to setting macros that account for individual differences and training demands.

Meal Timing

Meal timing matters less than people think. The research is clear: total daily intake is far more important than when you eat. If you hit your calorie and macro targets over the course of the day, you've done 90% of the work. The remaining 10% is optimization — real but marginal.

That said, there are some practical considerations worth following:

Pre-training nutrition

Don't train completely fasted if you can avoid it. Having some protein and carbohydrates 1–3 hours before training gives your muscles readily available fuel and amino acids. This doesn't need to be a full meal — a protein shake and a banana, or a small meal of chicken and rice, is sufficient. If you train first thing in the morning and eating beforehand makes you nauseous, at least have a small protein shake or some easily digestible carbs. Training fully fasted isn't dangerous, but it does slightly impair performance and muscle protein synthesis compared to training with some nutrition on board.

Post-training nutrition

The post-workout nutrition window is real but far wider than the "30-minute anabolic window" myth suggests. You don't need to slam a protein shake the second you rack the barbell. Aim for a protein-rich meal within roughly 2 hours of training. If you had a solid pre-workout meal 1–2 hours before training, you have even more flexibility — the amino acids from that meal are still circulating.

The urgency of post-workout nutrition increases if you train fasted or if you have another training session coming within 8 hours (relevant for two-a-day athletes). In those cases, getting protein and carbs in sooner genuinely matters.

Supplements Worth Considering

Most supplements are a waste of money. The supplement industry is largely unregulated, the marketing is aggressive, and the vast majority of products have either no evidence behind them or evidence showing trivial effects. Here is the short list of supplements with actual, repeatable evidence of benefit.

Creatine monohydrate

5g per day, every day. Creatine is the most researched supplement in sports science. It increases phosphocreatine stores in muscle, which improves performance on short, high-intensity efforts (heavy sets, sprints, explosive movements). The evidence for strength and lean mass gains is robust across hundreds of studies. It also has emerging evidence for cognitive benefits. Take it at any time of day — timing doesn't matter. Monohydrate is the form with the most evidence; there's no reason to pay more for "fancy" forms like HCL or buffered creatine. Loading phases (20g/day for a week) work but aren't necessary — 5g/day reaches saturation in about 3–4 weeks.

Caffeine

3–6mg per kg of bodyweight, taken 30–60 minutes before training. Caffeine is a genuine performance enhancer — it reduces perceived exertion, improves endurance, and slightly increases strength output. For a 75 kg person, that's 225–450mg, roughly equivalent to 2–4 cups of coffee. If you're caffeine-naive, start at the lower end. If you're a regular coffee drinker, you'll need more to see the ergogenic effect. Be mindful of timing — caffeine has a half-life of 5–6 hours, so avoid it within 8 hours of sleep if you're sensitive.

Protein powder

Not magic — just a convenient way to hit your protein targets. Whey protein is well-absorbed and has a strong amino acid profile. Plant-based blends (pea + rice protein) work just as well for muscle building when the leucine content is matched. Use it when whole food sources are inconvenient — post-workout, between meals, or mixed into oats. If you can hit your protein targets through food alone, you don't need powder at all.

Vitamin D

If you're deficient, which many people are — especially those who live at higher latitudes, work indoors, or have darker skin. Vitamin D plays a role in immune function, bone health, and potentially muscle function. Get a blood test (25-hydroxyvitamin D) to check your levels before supplementing. If you're below 30 ng/mL, supplementation is warranted. Typical doses are 1,000–5,000 IU per day depending on severity of deficiency, ideally taken with a fat-containing meal for absorption.

Sleep and stress management outweigh any supplement for recovery. See the recovery guide for evidence-based recovery strategies that actually move the needle.

Practical Tips

Nutrition doesn't need to be complicated. Here are the things that actually matter in practice.

Track food temporarily to build awareness

Track your food intake for 2–4 weeks using an app like MyFitnessPal or Cronometer. The goal isn't to track forever — it's to learn what your portions actually contain. Most people are surprised. That "small" serving of peanut butter is 300 calories. That chicken breast is only 30g of protein, not the 50g you assumed. After a few weeks of tracking, you'll have a much better intuitive sense of portion sizes and can estimate without a scale.

Prioritize protein at every meal

Build each meal around a protein source. Chicken, fish, eggs, beef, Greek yogurt, tofu, legumes, cottage cheese — pick one and build the rest of the meal around it. If protein is the first thing on your plate, hitting your daily target becomes straightforward. Fill the remaining calories however you prefer with carbs and fats.

Eat fruits and vegetables

This sounds obvious, but it's worth stating: eat at least 2–3 servings of fruit and 3–5 servings of vegetables per day. They provide fiber (critical for gut health and satiety), micronutrients (vitamins, minerals, antioxidants), and volume (you can eat a large amount for relatively few calories). A diet built entirely on protein powder, white rice, and chicken breast will hit your macros but miss important micronutrients.

Don't eliminate food groups without medical reason

Unless you have a diagnosed allergy, intolerance, or medical condition (celiac disease, lactose intolerance, etc.), there's no reason to cut out entire food groups. Gluten is not inherently harmful. Dairy is a convenient protein source. Carbs are not making you fat — excess calories are. Elimination diets often lead to unnecessary restriction, poor adherence, and eventual bingeing. Eat a varied diet.

Alcohol and training

Alcohol does impair recovery and muscle protein synthesis. This is well-documented. Even moderate intake (2–3 drinks) reduces MPS by up to 24% when consumed post-training. It also disrupts sleep architecture, dehydrates you, and adds empty calories (7 calories per gram with zero nutritional value). You don't need to be teetotal, but limit alcohol during hard training blocks. If you're serious about maximizing your results, less is better.

Hydration

Drink when you're thirsty. Your body's thirst mechanism works. A simple check: your urine should be pale yellow. Dark yellow means you're under-hydrated. Completely clear means you're probably over-hydrating (which dilutes electrolytes). During training, sip water between sets. In hot conditions or during endurance work lasting over 60 minutes, consider adding electrolytes (sodium, potassium, magnesium).