Calories, protein and macros explained
Plain explanations of calories, protein, macros and calorie deficits — the parts of nutrition that actually change results, without the diet-industry noise.
A calorie is a unit of energy. Weight change follows the balance between what you eat and what you use over weeks, which is why single days matter far less than the average.
Protein is the macro most people underestimate. It supports muscle when you are losing weight and keeps meals satisfying, which makes a deficit easier to hold.
Nutrition topics
Calories
How daily calorie needs are estimated and why the number is a starting point, not a rule.
Protein
How much protein per day and per meal, and where it realistically comes from.
Macros
Splitting your calories into protein, carbohydrates and fat without micromanaging.
Calorie deficit
What a sustainable deficit looks like and the signs one is too aggressive.
Frequently asked questions
- How many calories do I need per day?
- It depends on your body size, age and activity. Our free calorie calculator gives an estimate, and two weeks of real weight data tells you whether to adjust it.
- Is a calorie deficit necessary to lose weight?
- Yes, weight loss requires using more energy than you take in over time. How you create that deficit — portions, food choices, activity — is up to what you can keep doing.
Prefer to track it in the app?
Everything on this page is free to read. The Healti app is there if you want your meals, workouts and progress kept in one place.
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Healti provides general information about nutrition and training. It is not medical advice.