What are Macros? I keep reading the term, but I'm not sure what it means!
Macros is the short term for macro-nutrients. A macro-nutrient is a substance (as a protein, carbohydrate, or fat) required in relatively large quantities for growth, energy, and health. You can find them listed on the nutrition facts panel of most foods, or by using calorie counting apps and calculators.
Gram for gram, macro-nutrients are responsible for the calorie count in your food. One gram of carbohydrates provides 4 calories, one gram of protein provides 4 calories, and one gram of fat provides 9 calories.