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Nutrition Labels

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Nutrition Labels. Total Fat. saturated trans fats - cholesterol. Total Carbohydrate ... Nutrition advice. limit saturated fats particularly if blood cholesterol ... – PowerPoint PPT presentation

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Title: Nutrition Labels


1
1
Nutrition Labels
Total Fat saturated trans fats - cholesterol
Total Carbohydrate dietary fibers - sugars
Protein
Minerals - Na, Ca, Fe, Vitamins - A C
2
2
Dietary Macromolecules
Lipids Triglycerides from vegetable oil fat
cholesterol from animal tissue
Carbohydrates starch glucose sucrose
glucose fructose lactose glucose
galactose fiber cellulose (non-digestible
glucose)
Protein muscle fiber vegetable protein stored
in seeds, legumes
3
3
calories 9 x grams fat
4 x grams carbohydrate 4 x grams protein
Nutrition myths Old myth - Fat is bad New
myth Carbs are bad
Nutrition advice limit saturated fats
particularly if ?blood cholesterol limit carbs
from sugars/processed starches particularly with
insulin resistance exercise is beneficialto
all
4
4
MACROMOLECULES
Lipids Triglycerides, phosphoglycerides,
cholesterol, steroid hormones
Carbohydrates starch, cellulose,
glycogen, glucose
Protein enzymes, connective tissue,
cytoskeleton, membrane channels
Nucleic Acids DNA and RNA
5
6
Macromolecule Function
Lipid Carbohydrate Protein
membrane cell walls cell tissue

bone/skin
fat starch seed
protein oils glycogen muscle
protein fasting
steroid cell surface
peptide hormones antigens hormones
6
7
Macromolecule Function
Protein
7
8
Protein Functional Groups
O
Carboxylic Acid R -
C - OH
Amine R - NH2
See the handout on functional groups included in
you packet
8
9
Amino Acid
H H2N - Ca - COOH
R
9
Sidechain Categories
10
Nonpolar C H only (S)
Polar Hydroxyl or amide ( Trp)
Acidic carboxyl (-COOH)
Basic Amine (-NH2) (- Trp)
10
NONPOLAR
11
11
POLAR
12
O -CH2-C-NH2 Asn

-CH2-OH Ser
12
13
Acid proton donor
pK - log Keq pH at which COOH
COO- acid form
base form
13
14
if pH lt pK then more acid form if pH gt pK
then more base form if pH pK then equal
amounts of both
14
15
-NH2 H ? -NH3 base form
acid form
base proton acceptor
if pH lt pK then more acid form if pH gt pK
then more base form if pH pK then equal
amounts of both
15
16
ACIDIC
BASIC
16
17
Amino Acid
H H2N - Ca - COOH
R
What is correct ionized form at pH 7.0?
17
18
Amino Acid
H H3N - Ca - COO
R

What is correct ionized form at pH 7.0?
18
19
Amino Acid Tryptophan
Neurotransmitter Serotonin
19
20
H3N - CH COO-
CH2
OH
Amino Acid Tyrosine
Hormone Thyroxine (T4)
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