Macros are what make up the caloric content of a food, they are called Macronutrients. The three categories of macrconutients are Carbohydrates, Protein and Fats. These three makes up your daily calories and they are what determines whether you lose or gain fat. The caloric combination of these macros are where your total calories come from.
Here's how they are broken down:
- 1 gram of carbohydrates = 4 calories
- 1 gram of protein = 4 calories
- 1 gram of fats = 9 calories
What are Carbohydrates and why do we need them?
Carbohydrates, in both form of starches and sugars, are the macronutrients required in the largest amounts. When consumed and broken down, carbohydrates provide the major source of energy to fuel our daily activities. It is recommended that carbohydrates should supply 45 - 60% of out total daily energy expenditures and needs. Some carbohydrates we consume is converted into a type of starch known as glycogen, which will then be stored in the liver and muscles for later use as energy source.
Sure you have read about "Calories in vs Calories out". Does that mean that if you eat in a calorie deficit, you will lose fats? The answer is no. You will have to pay attention to your macrcos. Lets say you eat in a calorie deficit of 1600cals, but most of them come from carbs, you will not be losing fats. Instead you might even gain them.
Paying attention to macros and tracking them would mean that your diet would be in check and thus leading you to your goal, be it fat loss or muscle gain. Knowing your macros breakdown is absolutely critical in achieving your goals.