Title: Macronutrients

Key words: proteins, carbohydrates, fats, fibre, energy requirements

Date: 17/10/01

Category: Sample documents

Type: Article

Author: DJE Candlish

Macronutrients

 

The major nutrients present in food are:

Energy requirements

The body needs energy to carry out vital activities and to maintain itself at a constant temperature. This is provided by the energy in food. The energy provided by food is measured in Joules or calories. Each individuals has a different calorific requirement, which depends upon their size, weight, sex, age, normal daily activity levels and inherent basal metabolic rate. An average man needs up to approximately 2,750 kcal per day, while even an active woman needs only 2,200 kcal. However, a woman's requirements can be higher during pregnancy or if she is breastfeeding.

In addition to these major nutrients, our bodies also need a range of ‘micronutrients’. These are either vitamins or minerals.