Macronutrients form the basis of any nutrition plan. Regardless of whether you follow a strict diet plan or just eat whatever you feel like, you take in macronutrients every single day. Without an adequate macronutrient intake, your body would stop working. The amount of macronutrients in a given food determines how many calories are in that food. By figuring out exactly how many macronutrients your body needs each day and then eating that balanced amount, and adjusting your intake when things get stuck, you can achieve your health and weight loss goals.