UNIT 6 - BALANCED DIET

BALANCED DIET

When the diet is able to meet all the needs of an individual and also it provides an extra allowance for minor stresses and strains, the individual is said to be in a state of optimum nutrition.

OPTIMUM NUTRITION is also known as adequate nutrition or good nutrition.

GOOD NUTRITION thus provides all essential nutrients in correct balance which are further utilized to promote the highest level of physical and mental health. Such a state of nutrition can be attained through balanced diets.

BALANCED DIET can be defined as one which contains different types of foods (from all food group) in such quantities and proportions that needs for all the nutrients are adequately met and a small extra allowance is made as a margin of safety.

SAFETY MARGIN is taken into account due to individual variations, losses during cooking and processing and also minor illnesses.
Thus a balanced diet along with inclusion of various food groups focuses on the RDA for various nutrients.

RDA is defined as the estimates of intakes nutrients which individuals in a population group need to consume to ensure that the physiological needs of all subjects in that population are met.
RDA varies with age, sex, physiological state etc.

Factors affecting RDA

This nutritional requirement is influenced by –

1. age
2. growth 
3. gender
4. pregnancy
5. breastfeeding
6. illness
7. psychological and emotional stress
8. activity level
9. smoking
10. drinking.

IMPORTANCE OF BALANCED DIET

1. It includes variety of food items from all the food groups.
2. It meets the RDA for all nutrients
3. it provide safety allowances so as to withstand short duration of illness.
4. To maintain a state of positive health and optimal performance.
5. Prevents deficiency diseases.
6. Promotes and preserves health.
7. Promotes optimum nutrition thus maintains acceptable body dimensions.


DIGESTION, ABSORPTION, AND METABOLISM

• DIGESTION:
– Mechanical and chemical process in which food is broken down in the gastrointestinal (GI) tract, releasing nutrients in forms the body can use

• ABSORPTION:
– Process in which released nutrients are taken into the cells lining the GI tract

• METABOLISM:
– The sum of the body processes involved in converting food necessary for energy, tissue building, and metabolic controls

DIGESTION: BASIC PRINCIPLES

• Principle of Change
– The body cannot use food as it is eaten
– Food must be changed into simpler substances to be absorbed and then used by cells to sustain life

• Principle of Wholeness
– The parts of the digestive process comprise a continuous whole.
– Food components travel through the gastrointestinal (GI) system until they are delivered to cells or excreted

THE GASTROINTESTINAL SYSTEM
• A long muscular tube that begins with the mouth and ends with the anus (also called the alimentary canal or digestive tract)