If everyone had identical bodies, we could easily determine basal energy needs. But-luckily-this is not the case. Therefore, to establish your calorie needs you need to take into account your body size and composition, your age, and sex.In a nutshell, larger body mass requires more energy (that's to say more calories) than smaller body mass. Also, as you probably know, muscle burns more calories than does fat; so the higher your muscle to fat ratio, the higher your basal metabolic rate.Age brings with it a decrease of muscle in favor of fat, which lowers the basal metabolism; and metabolism itself tends to grow more inefficient with age. This means that your calorie needs naturally decrease as you grow older. Keep that in mind.As a rule, men have more muscle and less body fat than women of the same age and weight do. This is why men generally have a higher basal metabolic rate and burn more calories-just sitting still (or changing the channel)-than women do.


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