Macronutrients Explained: Protein, Carbs, and Fats

Calories tell you how much energy you eat. Macronutrients—protein, carbohydrates, and fat—tell you where that energy comes from and support different roles in your body.

Protein (4 kcal per gram)

Protein builds and repairs muscle, supports immune function, and helps you feel full. Active adults often aim for roughly 1.2–2.0 g per kg body weight, depending on goals and training. Good sources: chicken, fish, eggs, legumes, Greek yogurt, tofu.

Carbohydrates (4 kcal per gram)

Carbs are your body's preferred fuel for exercise and brain function. Prioritise whole grains, fruit, and vegetables over refined sugars alone. Low-carb diets work for some people, but they are not required for fat loss—calorie balance still matters most.

Fats (9 kcal per gram)

Fats are calorie-dense but essential for hormones, vitamin absorption, and satiety. Include unsaturated fats from olive oil, nuts, avocados, and oily fish; limit excessive trans fats and deep-fried foods.

Sample macro split

Many balanced diets land near 30% protein, 40% carbs, 30% fat—but adjust for preference, culture, and medical advice. If your app shows macros, use them to spot patterns (e.g. low protein at breakfast) rather than chasing perfection daily.

Track calories first; fine-tune macros once logging feels natural. Simple Calorie Counter keeps the focus on daily totals while you learn what works for your body.