Use macros to structure your daily nutrition. Protein supports muscle retention, carbs support training performance, and fats support hormones and satiety.
Popular split examples
Balanced: 30% protein / 40% carbs / 30% fat
High-protein: 40% / 30% / 30%
Keto: 30% / 5% / 65%
Extra parameters and explanations
Protein target methods: choose percent-of-calories, grams per kg bodyweight, or grams per kg lean mass (requires body-fat %).
Activity multipliers translate BMR → TDEE; choose based on weekly exercise frequency and intensity.
Goal sliders: use gradual deficits/surpluses for sustainable change. Rapid loss risks lean mass loss.
Macronutrients (macros) are the three nutrients that provide energy: protein, carbohydrates, and fat. Tracking macros — rather than just calories — gives you precise control over body composition. Two people eating 2,000 calories can have dramatically different results depending on how those calories are divided: one person eating 200g protein, 150g carbs, 67g fat will build more muscle and lose more fat than someone eating 50g protein, 200g carbs, 111g fat — even at identical calories.
Protein (4 cal/gram) is the building block of muscle tissue. It also has the highest thermic effect of food (TEF) — 20–30% of protein calories are burned in digestion. High protein diets preserve lean mass during calorie deficits and increase satiety, reducing hunger. Sources: chicken, eggs, Greek yogurt, cottage cheese, fish, legumes, tofu.
Carbohydrates (4 cal/gram) are the body's preferred fuel for high-intensity exercise and the brain's primary energy source. They replenish muscle glycogen after training. Fiber (a type of carbohydrate) feeds gut bacteria and slows glucose absorption. Prioritize complex carbs (oats, brown rice, sweet potatoes, vegetables) over simple sugars.
Fat (9 cal/gram) supports hormone production (including testosterone and estrogen), brain health, and absorption of vitamins A, D, E, and K. Healthy fat sources include avocados, olive oil, nuts, fatty fish, and eggs. Minimum 20% of total calories should come from fat to avoid hormonal disruption.
Recommended Macro Ratios by Goal
Fat loss: Protein 35–40%, Carbs 30–35%, Fat 25–30%. High protein maximizes muscle retention and satiety during a calorie deficit. Example for 1,800 cal: 158–180g protein, 135–158g carbs, 50–60g fat.
Muscle building (bulking): Protein 25–35%, Carbs 40–50%, Fat 20–30%. Carbs support training intensity and recovery. Surplus of 200–350 calories above TDEE. Example for 2,800 cal: 175–245g protein, 280–350g carbs, 62–93g fat.
Endurance sports (marathon, cycling): Protein 15–20%, Carbs 55–65%, Fat 20–25%. High carb intake replenishes glycogen for long training sessions. Carb loading (70–80% carbs) 1–2 days before long races maximizes glycogen stores.
Ketogenic diet: Fat 65–75%, Protein 20–25%, Carbs 5–10% (typically 20–50g net carbs). Switches the body to fat-burning ketosis after 2–7 days of carb restriction. Supported for certain therapeutic uses; mixed evidence for general fat loss compared to other approaches at equal calories.
General health maintenance: Protein 20–30%, Carbs 45–55%, Fat 25–30%. Flexible, sustainable ratio aligned with most dietary guidelines. Prioritize food quality over precise macro tracking.
Frequently Asked Questions
What's the easiest way to start tracking macros?
Start with protein only — hit your protein target each day for two weeks before adding carb and fat targets. This single focus builds the habit without overwhelm. Use an app like MyFitnessPal or Cronometer. Weigh food with a kitchen scale for accuracy. Once protein tracking feels automatic, add your other macro targets. Most people find that hitting protein naturally keeps total calories in a reasonable range.
Do I need to hit my macros exactly every day?
No. Aim for ±5–10g on each macro daily. Weekly averages matter more than daily perfection. A useful framework: hit protein within 10g daily (most important macro), keep fat above your minimum (hormonal health), and let carbs flex to balance total calories. Consistency over weeks and months produces results — obsessing over hitting exact daily targets leads to stress and often diet abandonment.
How much protein is too much?
For healthy adults with normal kidney function, intakes up to 2.2–3g per kg of bodyweight (1–1.4g/lb) are safe based on current research. Contrary to old myths, high protein diets don't damage healthy kidneys. They do increase the load on kidneys — people with existing kidney disease should restrict protein as advised by their doctor. Practically, eating more than 1g/lb of bodyweight provides diminishing returns for muscle building, so going much higher offers little benefit.
Should I eat different macros on rest days vs training days?
Carb cycling (higher carbs on training days, lower on rest days) can optimize performance and body composition, but adds complexity. For most people starting out, consistent daily macro targets are simpler and equally effective. If you're an advanced athlete looking to optimize, try higher carbs (and slightly lower fat) on workout days to fuel training, and lower carbs (higher fat) on rest days when glycogen demand is lower. Keep protein constant every day.
