how much calories

The amount of calories needed per day varies depending on factors like age, gender, weight, height, and activity level. Generally, adults require between 1,600 and 3,000 calories daily. For example, women aged 19 to 30 typically need about 1,800 to 2,400 calories per day, while men in the same age group need about 2,400 to 3,000 calories. The total daily calorie needs are calculated based on basal metabolic rate (BMR) multiplied by an activity factor ranging from sedentary (BMR x 1.2) to very active (BMR x 1.9) levels. Calories are consumed through foods and beverages, and the energy content varies by food type. Common food items range widely in calories, for instance, an apple has about 59 calories, a slice of pizza about 285 calories, and a cooked chicken portion about 136 calories (per 2 oz). Additionally, calories are burned through various exercises differently depending on body weight and activity intensity. In summary, the total calorie intake required depends on individual characteristics and lifestyle, with typical ranges for maintenance between 1,600 and 3,000 calories daily for most adults.