Nutrition Basics for Busy Engineers: Macros Made Simple

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You work long hours. You skip breakfast. Your lunch is whatever is nearest. You eat dinner late. You wonder why you are not seeing results from your workouts. The answer is almost certainly in your kitchen, not the gym. Training accounts for about 20–30% of body composition results. Nutrition accounts for 70–80%. This is not a small difference.

This guide does not ask you to weigh everything, download a tracking app, or follow a complex diet protocol. It gives you the practical nutrition principles that professionals use — explained simply, without the noise.

The Three Macronutrients: What They Do

Protein — Your Most Important Macro

Protein is made of amino acids — the building blocks used to repair and build muscle tissue after training. Without adequate protein, your body cannot recover from workouts, build muscle, or maintain a healthy immune system. Target: 1.6–2.2 grams per kilogram of bodyweight per day. For a 75 kg person, that is 120–165g of protein daily. This is non-negotiable for anyone training seriously.

Best sources: eggs (6g each), chicken breast (31g per 100g), canned tuna (25g per 100g), Greek yoghurt (10g per 100g), lentils (9g per 100g cooked), cottage cheese (11g per 100g). Spread intake across 3–4 meals — research shows muscle protein synthesis peaks at ~40g per meal.

Carbohydrates — Your Training Fuel

Carbohydrates are the body's preferred fuel for high-intensity exercise. Your muscles store glycogen (glucose) and use it during resistance training and HIIT. Low-carb training makes high-intensity work significantly harder. Do not fear carbohydrates — time them around your training. Eat the majority of your carbs in the meals surrounding your workout window.

Fats — Essential, Not Optional

Dietary fats are required for hormone production (including testosterone), vitamin absorption (A, D, E, K are fat-soluble), and joint lubrication. Cutting fat too low disrupts hormone levels and recovery. Aim for 0.8–1g per kg of bodyweight from quality sources: avocado, olive oil, nuts, eggs, oily fish.

Simple Rules That Actually Work

1. Eat protein at every meal. Every single meal. If there is no protein source on your plate, add one before anything else.
2. Prioritise whole foods. The less processed, the better. Not because of "chemicals" — because whole foods are more satiating, nutrient-dense, and harder to overeat.
3. Do not drink your calories. Juices, soft drinks, flavoured coffees, and alcohol add hundreds of calories with zero satiety. Drink water, black coffee, and tea.
4. Prepare your food in advance. You will not eat well when you are hungry and have nothing ready. Cook once, eat twice. Batch cooking one day per week is the single highest-leverage nutrition habit for busy people.
5. Eat enough total food. Most people trying to lose weight under-eat, then binge. Eat at a moderate 300–500 calorie deficit — not 1,000+. Sustainable fat loss is 0.5–0.75% of bodyweight per week.

Hydration: The Free Performance Enhancer

A 2% reduction in body water causes a measurable decline in strength, endurance, and cognitive performance. Most people are chronically mildly dehydrated. Drink 35–40 ml per kilogram of bodyweight per day — more on training days and in hot climates like Tigray. For a 75 kg person: minimum 2.6–3 litres daily. Urine colour should be pale yellow — clear means overhydration, dark means dehydration.

"You cannot out-train a bad diet. But you also do not need a perfect diet — you need a good-enough diet executed consistently."