UNIT 3 SEMINAR NS 220

Module 3: Proteins and Health

Module 3: Overview of Protein

Diets rich in protein in U.S.; other parts of world may be deficient

4 calories/gram Contains nitrogen, carbon,

hydrogen, and oxygen to form amino acids Amino acids linked together to form proteins Need to replenish protein in body via food

Amino Acids

Body uses 20 different AA’s to function 11 are Nonessential AA’s 9 are Essential AA’s Both present in protein foods If don’t eat enough essential AA’s, body

eventually breaks down other proteins- health deteriorates.

Dietary Protein

Animal proteins Ample amounts of all 9 essential AA’s High-quality proteins

Plant proteins Many are low in one or more essential AA’s Lower-quality proteins, so need to consume a variety

of plant proteins; > amount needed for protein synthesis

Adults need ~20% of pro requirement from essential AA’s; typical diets= 50%

Protein Needs

If aren’t growing, need enough protein to match whatever is lost daily from protein breakdown = protein equilibrium (protein balance).

Positive Protein Balance: eat more than body loses/day to build new tissues; growing bodies, recovery from illness/injury, weight training.

Negative Protein Balance: consuming less protein than needed

Increased by ~15-25 grams per day during pregnancy What is the problem with eating too much protein on a

chronic basis?

Terms to Know…

Amino Acids

Essential & Nonessential Amino Acids

Complete & Incomplete Proteins

Limiting Amino Acid

Kwashiorkor

Marasmus

Vegetarian Diets

Some death rates (CA, DM Type 2, Obesity, heart disease) are lower

What are some nutritional

benefits of eating a vegetarian

diet? Why become a vegetarian?

Types of Vegetarians

Vegans Fruitarians Lacto-vegetarians Ovo-vegetarians Lacto-ovo-vegetarians

Protein and Nutrient Profiles

6-ounce porterhouse steak= 42 grams protein; 44 grams of fat, 16 grams sat.

fat (~three-fourths of the recommended daily intake for saturated fat).

6-ounce salmon= 42 grams of protein; 18 grams of fat, 4 grams sat.

fat 1 cup cooked lentils=

18 grams of protein; <1 gram of fat.

Protein Content in Foods

Beef= 7 grams/ounce Poultry= 7 grams/ounce Fish= 7 grams/ounce Large Egg= 7

grams/egg Milk= 8 grams/cup Cheese (eg. Cheddar)=

7 grams/ounce

Bread= 4 grams/slice Cereal= 4 grams/1/2 cup Vegetables= 2 grams/ 1/2

cup Soybeans (dry)= 10

grams/ounce Peanuts= 7 grams/ounce Lentils (dry)= 6.5

grams/ounce Red beans= 6 grams/ounce Cashews= 5 grams/ounce

Case Study

Mary and Leon are married college students, both 21 years old. They live on a limited income and became vegetarians two years ago when they became involved in the ecological movement on campus. Mary, who at 5’9” weighs 110 lbs, has just discovered that she is pregnant with her first child. She requests advice about an appropriate diet.

Case Study

What other information do you need to gather about Mary’s diet habits?

What is the basic nutritional increase she will need during her pregnancy? How much increase?

What is Mary’s general protein requirement according to her weight? How many grams of protein will she need during pregnancy?

Case Study

Is Mary’s weight appropriate for her height?

Should Mary gain >24-30 lbs that is recommended for normal pregnancy?

If Mary and Leon are vegans, will she be able to get the quality & quantity of protein she needs? What food combos would you recommend?

Case Study

Why does Mary need adequate carbohydrates in her prenatal diet?

If Mary has an adequate diet in pregnancy will she be in positive or negative protein balance? Why?