Diet_and_Nutrition

Diet_and_Nutrition - 1 Diet and Nutrition Diet and...

Info iconThis preview shows pages 1–4. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: 1 Diet and Nutrition Diet and Nutrition GM Roybal, M.D., M.P.H. HP 200 Fall 2006 September 12, 2006 How important is diet in How important is diet in maintaining health? maintaining health? Very! Accumulating evidence of a link between diet and disease, especially chronic disease Cardiovascular disease Diabetes Osteoporosis Cancer Breast, prostate, colon Some terminology Some terminology Diet : Anything you eat. Nutrition : The study of nutrients in foods and of their ingestion, digestion, transport, metabolism, interaction, storage, and excretion. Essential nutrient : A nutrient which cannot be synthesized by the body, or not in amounts necessary to meet metabolic need; therefore, must come from the diet. Six classes of nutrients Six classes of nutrients Carbohydrates Protein Fat Vitamins Minerals Water Energy providing nutrients! 2 C calories or calories or c calories? calories? Calorie is a measure of energy (heat) generated by a substance. Calorie of heat is cal Food calorie Cal is 1000 heat calories. 1 Cal = 1 kcal = 1000 cal Carbohydrates: Carbohydrates: 4 kcal/g 4 kcal/g Can classify carbohydrates two ways Simple Monosaccharides: glucose, fructose, galactose Disaccharides: sucrose, lactose, maltose Complex Polysaccharides: starches, dextrins, glycogen, fiber Glycogen is the storage form of carbohydrate in the body, found in the muscle and liver Fiber: soluble and insoluable Cellulose: Insoluable fiber (eg. Bran) Pectin: Soluble fiber (fruit) Functions of carbohydrates Functions of carbohydrates The main function of carbohydrate is to provide energy. They aid in fat metabolism. They spare protein. Glucose is the only fuel used by the brain. They stimulate the movement of the gastrointestinal tract. Protein: 4 kcal/g Protein: 4 kcal/g Most Americans consume far more protein than they need. Proteins are formed from smaller units called amino acids Amino acids contain nitrogen (some contain sulfur). 20 different amino acids. 3 Classification of amino acids Classification of amino acids Amino acids can be classified as either essential or non-essential. Essential Amino Acids: the body cannot synthesize the carbon skeleton. Non-essential Amino Acids : the body can synthesize the carbon skeleton....
View Full Document

Page1 / 12

Diet_and_Nutrition - 1 Diet and Nutrition Diet and...

This preview shows document pages 1 - 4. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online