What are macros and how much protein, carbs and fat do you need?

Macros (macronutrients) are the three main nutrients needed in larger amounts, protein, carbohydrates and fats. The right balance varies by age, body size, activity level, health status and goals. General guidelines suggest carbohydrates provide 45-65% of daily calories, fat 20-35% and protein 10-35%. Strength training may require more protein, while carbohydrate needs can vary with activity.