Define nutrition.
Processes involved in the ingestion, digestion, absorption, and use of foods and fluids by the body.
What are factors greatly affected by what we eat?
Since early in childhood, food becomes associated with:
Briefly describe the function of the digestive system.
Digestion
Process of changing food into a useable form for the body that takes place in the digestive system.
Digestive system: Mouth
Digestive system: Esophagus
Digestive system: Stomach
Digestive system: Small intestine
Digestive system: Duodenum
- the juices chemically break down the nutrients so that they can absorbed
Digestive system: Jejunum and ileum
-most of the absorption of nutrients takes place in these two places
Digestive system: Liver
Digestive system: Gall bladder
Digestive system: Pancreas
- juices from pancreas and small intestine are added to chyme
Digestive system: Large intestine
Define nutrients.
Substances that are ingested, digested, absorbed and used by the body.
Nutrients: Protein
Nutrients: Carbohydrates
Nutrients: Fats
Nutrients: Vitamins
Nutrients: Minerals
Nutrients: Water
Which are the best sources of energy and why?
If you eat 3 grams of carbohydrate, 4 grams of protein and 2 grams of fat, which will give you the most calories in kJ?
3 grams of carbohydrate = 328kJ = 84kJ
4 grams of protein = 428kJ = 112kJ
2 grams of fat = 2*63kJ = 126kJ