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The calorie widget calculates how many calories you need to consume in order to gain or lose weight.
In step 1 of the calorie calculator widget you can input your height, age, gender, weight and your activity level. This information is used to calculate your total daily calorie expenditure. (Calories are a way to measure energy consumed).
In step 2 of the calorie calculator widget you can input how much weight you want to gain or lose. Based on this information the calorie widget creates a calorie surplus or a calorie deficit in your diet that will help you achieve your target weight. Depending on how much weight you want to gain or lose you can adjust your calorie intake or your activity level to achieve your desired result.
Your BMI is a measurement of your body weight based on your height and weight. Although your BMI does not actually “measure” your percentage of body fat, it is a useful tool to estimate a healthy body weight based on your height. Due to its ease of measurement and calculation, it is the most widely used diagnostic indicator to identify a person’s optimal weight depending on his height. Your BMI “number” will inform you if you are underweight, of normal weight, overweight, or obese. However, due to the wide variety of body types, the distribution of muscle and bone mass, etc., it is not appropriate to use this as the only or final indication for diagnosis.
The rate at which energy (calories) is used for the essential life functions is called Basal Metabolic Rate (BMR). Basal metabolism includes most of the involuntary things the human body does to support life – such as breathing, blood circulation, body temperature regulation, nervous system operations, etc., but not the extra energy needed for any additional physical activity such as gym exercise. In other words, if you laid in bed all day doing nothing else, then you would need to eat at least the number of calories roughly equal to your BMR in order to maintain your normal body functions.