Bell ringer

If you find out your diet isn’t as good as it should be, would you do something to change it? What would you be willing to do?

The typical American teen diet

Not enough Vitamin A and Vitamin C

*Vitamin A: eye function; skin, hair & nails; immune response

Deficiency: infectious diseases and vision problems

*Vitamin C: wound healing, growth, blood vessel health

Deficiency: anemia, bleeding gums, decreased ability to fight infection, decreased wound-healing rate, easy bruising, swollen and painful joints, weakened tooth enamel

Not enough Iron and Calcium

*Iron (Fe): red blood cell function

Deficiency-anemia, fatigue, memory and mental function in teens

*Calcium (Ca): bones, teeth, nerve & muscle function

Deficiency-osteoporosis later in life (brittle bones that break easily)

Too much cholesterol, sodium, and fat

Cholesterol: important for production of Vitamin D and sex hormones, needed for digestion

Too much: clog arteries and lead to heart disease, stroke

Sodium: needed for nerve function

Too much: high blood pressure, heart and kidney problems

Fats: structural building blocks, insulation, cushioning of organs

Too much: obesity, heart disease

No more than 1/3 of your calories should come from fat

What is a calorie?

Calorie = measure of energy content of food

1 cal = E needed to raise temperature of 1 gram of water by 1 degree C

Very tiny quantity: when people say “calorie” it actually means kcal

Calorie value of foods

When you “burn” calories in exercise or just daily metabolism, you use calories your body has stored

Fats: 9 cal/g

Carbohydrates, proteins: 4 cal/g

When your body breaks down the macromolecules the stored E is repackaged as ATP

Task

Analyzing sample teen diet

--record information from nutrition labels onto chart

--total each column

--answer questions on separate sheet

Boys—fill out for boys, girls for girls

Reading a food label

Calculating % increase or decrease Formula:

change in amount x 100

original amount

Example: target calories = 2500

actual calories = 3500

So 3500 – 2500 = .40 = 40% excess

2500