2What is nutrition?The study of how your body uses the food you eat.
3What is a nutrient?A nutrient is a chemical substance in the body that helps maintain the body.
4The Six Classes of Nutrients Your body needs over 50 different nutrients which can be divided into 6 classes:CarbohydratesFatsProteinsVitaminsMineralsWater
5Carbohydrates Functions Types Sources: Provides body main source of energyProvide bulkHelps the body digest fatsTypesSimple –SugarsComplexStarches and FiberSources:Sugars—honey, jamFiber sources—fruits, vegetables, whole grainsStarch sources—breads, cereals, pasta
6Fats Functions Types Types Provides energy Carries fat-soluble vitaminsProtects vital organs and provides insulationProvides essential fatty acidsTypesFatty AcidsCholesterolTypesFatty AcidsSaturated –raises LDLPolyunsaturated-decreases LDLMonounsaturated-decreases LDL and increases HDLCholesterolLDL-”bad cholesterol”HDL-”good cholesterol”
7Sources of FatsCheeseButterNutsMeatsDressingsChocolate
8Proteins Functions Types Sources Build and repair tissues Help body make important substancesRegulate body processesSupply energyTypesComplete: contains adequate amounts of all essential amino acidsIncomplete: Lacks some amino acidsSourcesMeat-CompleteMilk-CompleteEggs-CompleteFish-CompleteNuts-IncompleteLegumes-Incomplete
9Vitamins Can be divided into two main categories Fat-soluble vitamins dissolve in fatscan be stored in fatty tissues of the bodyWater-soluble vitaminsdissolve in waterare not stored in the body
15Water Functions Sources Aids digestion and cell growth and maintenance Facilitates chemical reactionsLubricates joints and cellsRegulates body temperatureOverall well-beingSourcesWaterMilkFruits and VegetablesOther LiquidsSome Foods
16Nutrient Deficiencies Not getting enough nutrients can lead to deficiency diseases. SymptomsProtein-energy malnutritionKwashiorkorEdema, irritability, anorexia, enlarged liverVitamin D and CalciumOsteoporosis/RicketsBrittle bones and bow legsIodineGoiterSwelling of the thyroid glandIronAnemiaFatigue, weakness, poor appetite, constipationThiaminBeriberiAffects nervous system, pain, vomiting, difficulty walkingNiacinPellagraDiarrhea, dermatitis, dementiaVitamin CScurvySpongy, bleeding gumsVitamin ANight blindnessDifficulty or inability to see in low light or darkness
17Excess NutrientsAs with everything, too much of any one thing is not good for you and the same thing goes for nutrients.Excess energy nutrients-carbohydrates, fats, and proteins-can lead to unhealthy weight gainExcesses of some vitamins and minerals can lead to toxicity (poisoning) and other complications
18Activity Write down what you ate on yesterday. For each food you ate, list the nutrient class that it would fall under.