... 10 to 18 year old boy would differ from that of a 10 to 18 year old girl with the same body mass and PAL as the boy, the girl would need less energy than the boy would. That of an adult male with the same mass and pal as the boy would differ as they younger boy needs less energy for physical activity level, where as the adult male would need more energy than the boy as his body requires this as over time it begins to slow down. Then term Dietary Reference Value (DRV) is a dietary reference to the amount a person should eat to maintain a healthy diet, it also shows that not every one of the same age and sex should have the intake of nutrients they differ from one and other. The Recommended Daily Allowance was in 1943 published by the US Government to help plan diets ...

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