For most people, these basic processes account for most of the calories you burn every day. Any physical activity, from cleaning the house to going for a jog, burns calories above and beyond this basic amount. Basal metabolic rates vary from person to person, and there are a number of factors that can influence how many calories your body needs to function. Body size: Just as an SUV requires more fuel to run than a regular sedan, bigger bodies require more calories for fuel than smaller ones. As a result, your height and weight will affect the number of calories you burn. Body composition: Muscle requires more energy than fat, so the more muscle you have in relation to fat, the more calories your body needs to function. Age: Metabolism naturally slows as you age. As well, many people lose muscle and gain fat as they age, contributing to the slowdown. Gender: Because men usually have more lean muscle mass than women, their metabolism tends to be slightly higher. The number of calories you need per day depends on your basal metabolic rate and on the number of calories you burn through physical activity. The calculation’s simple. If you want to maintain your weight, you need to burn the same number of calories per day as you consume. To lose weight, you need to burn more calories than you consume, while to gain, you need to consume more calories than you burn.
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