MacronutrientsProtein, carbohydrate (sugars andstarches) and fats all provideenergyThe amounts are:1 g protein provides 4 kcal1 g carbohydrate provides 4 kcal1 g fat provides 9kcal
Macronutrients Protein, carbohydrate (sugars and starches) and fats all provide energy. The amounts are: 1 g protein provides 4 kcal 1 g carbohydrate provides 4 kcal 1 g fat provides 9 kcal
ProteinProteins are the major functional andstructural components of all the body's cellsProteins may also be a source ofenergyduring times of energy deprivation, althoughfat and carbohydrate are utilizedpreferentially by the body
Protein □ Proteins are the major functional and structural components of all the body’s cells □ Proteins may also be a source of energy during times of energy deprivation, although fat and carbohydrate are utilized preferentially by the body
Essential AminoAcidsAdult & Infants: leucine, isoleucine, valine.threonine, methionine, phenylalanine.tryptophan, lysine, histidineInfants only: cysteine, tyrosine,arginine
Essential Amino Acids Adult & Infants: leucine, isoleucine, valine, threonine, methionine, phenylalanine, tryptophan, lysine, histidine Infants only: cysteine, tyrosine, arginine
Biological Value of a ProteinQuantity and proportionofessential amino acids
Quantity and proportion of essential amino acids. Biological Value of a Protein
Sources - High-quality ProteinsAll animal proteins (liver, meat, fish, cheesemilk etc) are complete, i.e. they contain allthe essential amino acids and are ofhighbiological valueBreast-milk proteins and eggs havethehighest value,Most vegetable proteins, except soy, areincomplete
□ All animal proteins (liver, meat, fish, cheese, milk etc) are complete, i.e. they contain all the essential amino acids and are of high biological value. □ Breast-milk proteins and eggs have the highest value. □ Most vegetable proteins, except soy, are incomplete. Sou rces – High-quality Proteins