26/04/2023
* Personal preference
* Pleasure
* Emotional comfort
* Ethnic heritage or tradition
* Habit
* Social interactions
* Availability
* Convenience
* Economy
* Positive and negative associations (happy occasions, sickness after eating, used as punishment or reward, etc.)
* Personal Values (political and environmental views, religious beliefs, etc.)
* Body image
* Health benefit (true or false knowledge)
* Maintain life
The study of nutrition uses scientific research in an endeavor to measure human nutritional requirements for:
â Growth
â Maintenance and repair
â Activity
â Reproduction Nutrition
Optimal Nutrition Requires
⢠Good decisions in food selection
⢠Balance and variety in foods eaten
⢠Dietary choices based on quality scientific research .
What are nutrients?
Nutrients are substances used in your body to:
⢠Produce energy
⢠Provide essential building blocks for all the bodys needs and functions
⢠Protect the body from many chronic diseases The six (6) essential classes of nutrients include:
⢠Water
⢠Macronutrients (needed in larger quantities): carbohydrates, fats, protein
⢠Micronutrients (needed in small quantities): vitamins, minerals Chemical Composition of Nutrients Minerals (the simplest): Indestructible elements that help to facilitate chemical reactions. Each element is composed of identical atoms. For example, iron remains iron if the food is raw or cooked, if it is in the red blood cell, when the cell is broken down, and when the iron is lost from the body by excretion.
It is defined by scientists as an inorganic nutrient because it contains no carbon.
Water (next simplest): Made of two elementsâhydrogen and oxygen. Classified as an inorganic nutrient.
Carbohydrate (more complex): A significant and efficient energy source (starches, sugars, fibers, and more). Classified as an organic compound since it contains carbon, as well as hydrogen and oxygen. They produce the least waste when used for energy.
Fat (more complex): Moderate source of dietary energy, needed for production of hormones and absorption of vitamins A, D, E, and K. Found in cell walls. Helps store energy in the body. Classed as an organic compound.
Protein (more complex): Promotes growth, cellular repair, formation of DNA and enzymes, moderate energy production, and more. This organic compound contains carbon, hydrogen, and oxygen (like carbohydrates and fats), but also contains nitrogen and sometimes sulfur.
Vitamins (more complex): Organic compounds needed in extremely small amounts for metabolic processes.