ESS 3 Lecture Notes - Lecture 1: Overnutrition, Malnutrition, Scientific Method
Science of nutrition
Nutrition: the study of dietary intake and behavior
➔Nutrients and constituents in food including their use in the body and influence on
human health
Nutrients: chemical substances that provide nourishment necessary for growth and the
maintenance of proper body functioning
➔Essential nutrients: Nutrients that the body cannot produce or produce in sufficient
amounts to meet the body’s needs
◆must be supplied through the diet
➔Nonessential nutrients: nutrients that are present in food but not required in our diet
◆Nutrients that can be manufactured by the body but can still have vital roles
◆Examples: cholesterol, certain amino acids
➔The quantity and variety of nutrients in foods can promote health or increase risk of
disease
Six classes of nutrients necessary for the body to function
➔Carbohydrates
➔Proteins
➔Fats (lipids)
➔Vitamins
➔Minerals
➔Water
Macronutrients
Macronutrients yield energy
➔Carbohydrates, fat (lipids), protein
➔Fiber comes from carbohydrates
◆Helps with weight maintenance, cholesterol levels, gastrointestinal system
➔Fats (lipids) required for synthesis of hormones
➔Proteins are important for structural and fluid balance in the body
Breakdown of nutrients provide energy
➔Energy is the capacity to do work
◆All bodily processes require energy
➔Energy in food is measured as kilocalories
◆Kilocalorie (kcal) = 1000 calories
◆Calorie = kcal = 1000 calories
◆Kcals are listed as “calories” on food labels
Energy-yielding nutrients
➔Macronutrients : source of kcalories
◆Carbohydrates = 4 kcal/g
◆Protein = 4 kcal/g
◆Fat = 9 kcal/g
● Higher energy density
➔Alcohol = -7 kcal/g
➔Lower energy density foods contribute to weight loss
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Document Summary
Nutrition: the study of dietary intake and behavior. Nutrients and constituents in food including their use in the body and influence on human health. Nutrients: chemical substances that provide nourishment necessary for growth and the maintenance of proper body functioning. Essential nutrients: nutrients that the body cannot produce or produce in sufficient amounts to meet the body"s needs. Nonessential nutrients: nutrients that are present in food but not required in our diet. Nutrients that can be manufactured by the body but can still have vital roles. The quantity and variety of nutrients in foods can promote health or increase risk of disease. Six classes of nutrients necessary for the body to function. Helps with weight maintenance, cholesterol levels, gastrointestinal system. Fats (lipids) required for synthesis of hormones. Proteins are important for structural and fluid balance in the body. Energy is the capacity to do work. Energy in food is measured as kilocalories. Kcals are listed as calories on food labels.