Food and nutrients provide
energy and building materials for countless substances that are essential
for growth and survival of living things. Food is
thus the prime necessity of life.
The food we eat is digested and assimilated in the body and used for its maintenance and growth. The manner in which nutrients become integral
part of the body and contribute to its function depends on the physiological
and biochemical processes that govern their actions.
This section opens with an overview of the processes of digestion, absorption, transportation and excretion because these functions determine the fate of the food after it enters the body.
health comprises of a sound body and a sound mind. Sound body is the outcome of food
and nutrients we consume, their digestion, absorption,
and excretion. Food provides the energy and building materials for our growth
Our food mainly consists of nutrients like proteins, carbohydrates, vitamins,
minerals and fats that promote good health
Nutritional supplements are provided when dietary
needs are not met. This may occur in case of old age, pregnancy
and various deficiency diseases.
As the age progresses, absorption and utilization of
nutrients decreases and supplementation becomes
necessary. In case of pregnancy there is increased
nutrient requirement due to the growing fetus;
therefore supplements becomes necessary. In the
treatment of various deficiency disease, the nutrient
is provided in high doses which can be obtained by the
However, supplementation requires continuous
monitoring as it may lead to toxicity.