2,000 Calorie Diet sets the Recommended Daily Intake of the nutrients that is considered to be sufficient to meet the requirements of 97–98% of healthy individuals in every demographic in the United States. 2,000 cal diet set all daily intakes for macronutrients (fat, carbohydrates, protein) and daily intakes for micronutrients (vitamins and minerals).
Having all nutrients let you stay energized without stimulants for hours. Being a standard reference, 2000 Calorie Diet specifications should be adjusted according to personal parameters (weight, height, activity, etc) to calculate a personal intake. This can be done with Body Mass Index calculator.