Final answer:
An individual at an active level, doing at least 2.5 hours of PA per week, may need 2,000 to 3,000 calories per day, depending on their body specifications and the intensity of the activities.
Step-by-step explanation:
The amount of calories needed by an individual who is at an active level, engaging in at least 2 and a half hours of physical activity (PA) per week, can vary based on many factors, including body mass, age, height, gender, and specific exercise intensity and duration. However, the general guideline states that on average, a person needs 1500 to 2000 calories per day to sustain daily activities. For those engaging in moderate exercise for about 1 hour daily or more, the number of calories needed increases and could range from 2,000 to 3,000 calories per day, especially if the activity level is high or includes vigorous-intensity exercise.
It's essential to note that the total daily energy expenditure includes resting metabolic rate, thermic effect of food, and energy expended during physical activity. Therefore, an individual with an active lifestyle should ensure they are consuming sufficient calories to support their increased energy demands, including the discretionary calories that may be allowed for additional nutrient needs due to physical activity.