Man has evolved as the dominant species on earth by being able to exploit natural resources to the highest extent. In fact, Man has been able to convert wealth of Nature into resources for his progress. Different human groups have been found to be innovative at certain stages of their existence and pursue varieties of sustantecular activities. The ways and means lie with their level of intelligence and tecl1nological development and backed by the biological capacity to convert more energy from less amount of food. In fact humans have been found to vary considerably, in consumption pattern, quantity of food and physical labour.
Larger quantity of food is consumed by people who are engaged in harder physical labour. Standard calorie consumption for an agricultural labourer (male) should be 3900 k cal and that of a lactating mother should be 3550 k cal. But in India this is far from reality. The energy derivation process of various types of human groups at different stages of technological development is expected to ensure adequate supply of energy packed food. Class-wise analysis of quality and quantity of food impresses upon us that people with lower technological development have to render more physical effort to drive home food, which may or may not be of adequate value.
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