Mid Term #2 Flashcards
Fill in the blank:
Triglycerides are the most common lipid found in food and in the body; they consist of a ______ backbone attached to three fatty acids.
Glycerol
Fill in the blank:
Fatty acids are classified based on the degree to which the carbon chain is saturated with _______.
Hydrogen
Fill in the blanks:
A fatty acid is _______ if it contains no carbon-carbon double bonds, _________ if it has only one carbon-carbon double bond, and __________ if it contains two or more carbon-carbon double bonds.
- Saturated
- Monounsaturated
- Polyunsaturated
The unsaturated fatty acids can exist in one of two structural forms. What are they?
Cis:
- Hydrogens=same side of the carbon-carbon double bond
Trans:
- Hydrogens=double bond lie on opposite sides of the bond.
Are lipids enzymes?
no
What are the three things that lipids do?
- Store energy
- Insulate
- Part of cell membranes.
What does fat add directly to a meal?
Enticing flavor and aroma
What does the mouth do in fat digestion?
Saliva minor digestion of fat
What does the stomach do in fat digestion?
Minor fat digestion by gastric lipase.
What does the small intestine do in fat digestion?
Site of most fat digestion and absorption.
What does the liver do in fat digestion?
Secretes bile to emulsify fats.
What does the pancreas do in fat digestion?
Secretes pancreatic lipase and other enzymes for fat digestion.
Fill in the blank:
The salivary glands, stomach, and pancreas secrete _______ enzymes to break down triglycerides into monoglycerides, fatty acids, and glycerol.
Lipase
Fill in the blank:
The products of fat digestion (monoglycerides, fatty acids, and glycerol) are absorbed into the cells of the _________.
Small intestine
Fill in the blank:
Immediately after absorption, the products of fat digestion are resynthesized into triglycerides within the cells of the ________.
Small intestine
What are Chylomicrons?
Before they can be transported through body fluids, dietary lipids must be packaged as lipoproteins
What is the Lymphatic system?
These lipoproteins are absorbed from the gastrointestinal tract into the vessels of the lymphatic system.
Fill in the blank:
The liver secretes ______ to emulsify fats in the chyme in the small intestine.
Bile
What carries absorbed lipids from the small intestine to body cells?
Chylomicron
What arises from VLDL and carries mostly cholesterol to the cells?
LDL
What is VLDL?
Carries to body cells mostly triglycerides taken up from the bloodstream by the liver as well as any fat made by the liver.
What is HDL?
- Arises mostly from the liver and intestine
- Carries cholesterol from cells to other lipoproteins and to the liver for excretion.
What should the recommended fat intake?
20-35%
What is considered an essential fatty acid?
Linoleic acid
Fill in the blank:
Olive oil contains mostly ______ fatty acids.
Monounsaturated
What is a food that is cholesterol free?
Peanut butter
Which combination of foods provide the best source of omega-3 fatty acids?
Carrots and snow peas stir-fried in canola oil.
What food is the best source of EPA and DHA?
Fatty fish
Is it higher or lower?
Coconut oil is ________ in saturated fatty acids than butter and beef fat.
Higher
What do Omega-3 fatty acids tend do to blood clotting?
Decrease
What do Omega-3 fatty acids do to inflammation in the body?
Decrease
What does Omega-6 fatty acids do to clotting and inflammation in the body?
Increase to both
What do omega-3 fatty acids as a dietary supplement do to circulating triglyceride levels in the blood?
Decrease
Fill in the blank:
Fish oil capsules are associated with a(n) ________ in rheumatoid arthritis symptoms and some behavioral disorders and cases of mild depression.
Decrease
What is NOT a component of plaque?
Chylomicron
What are the three components of plaque?
- Oxidized LDL
- Platelets
- Calcium
What are some components of an anti-atherosclerotic lifestyle?
- Smoking cessation
- Engaging in daily physical activity
- Dietary pattern low in saturated and trans fats
- Dietary pattern high in fruits and vegetables
Which of the following individuals would be at highest risk for cardiovascular disease?
50-year-old man; Abdominal obesity; HDL-C = 39 mg/dl
Besides her fat intake, what other dietary modifications could improve Jackie’s heart health?
Choose whole grains instead of refined grain products.
What are the functions of lipids?
- Energy use and storage
- Insulation and protection
- Hormone synthesis
- Nerve impulse transmission
- Component of absorbing vitamins
- Nutrient transport
What makes up Triglycerides?
- Fatty acids
- Glycerol
What makes up sterols?
Cholesterol
What are fatty acids?
- String of carbons
- Methyl group one end, acid group other end
- Differ in number and position of types bonds
What is Triglyceride makeup?
Glycerol backbone + three fatty acids
What is Monoglyceride makeup?
Glycerol + 1 fatty acid
What is Diglyceride makeup?
Glycerol + 2 fatty acids
What are saturated fats?
Properties:
- 0 double bonds
- Carbon chain completely filled with hydrogen
Food sources:
- Animal fats
- Tropical oils like coconut oil
Health implications:
- High intake may increase risk for CVD
What are Monounsaturated fats?
Properties:
- 1 double bond
Food Sources:
- Olive and canola oils
- Avocado
- Peanut butter
Health implications:
- May decrease risk for CVD
What are Polyunsaturated fats?
Properties:
- Two or more double bonds
Food sources:
- Plant oils
- Fatty fish
- Nuts
Health implications:
- Depends on the type (omega 3 most heart-healthy)
What is Linoleic acid?
- omega-6 fatty acid family
- Food sources: plant oils, margarine, mayonnaise
What is Linolenic acid?
- omega-3 fatty acid family
- Food sources EPA +DHA: In plants ALA: canola oil, flax, walnuts
What are the benefits of Omega-3?
- Lower blood pressure
- Prevent blood clot formation (large amounts may cause bleeding, bruising)
- Protect against irregular heartbeats
- Reduce blood triglyceride levels
- Brain vision function (especially in infants)
What is the maximum amount of fish you should eat?
Limit fish to 12 oz/week
What is cholesterol?
- Produced by liver
- Used to make hormones, bile acids, and Vitamin D
- No energy
- Food sources: ONLY in animal products (even healthy ones)
What are the main cause of increases in cholesterol?
Saturated fat and trans fat are the main culprits for raising blood cholesterol
What are Phospholipids?
- Glycerol + 2 fatty acids + phosphate
- Form structure for cell membranes
What are the 3 parts of Lipid Absorption?
- Bloodstream
- Turn into triglycerides
- Transported via chylomicrons in the lymphatic system
What are the four things that participate in cholesterol/lipid transport lipoproteins?
4 kinds:
- Chylomicrons: dietary fat transporters
- VLDL (very low density lipoprotein): fat deliverers
- LDL (low density lipoprotein): cholesterol deliverers
- HDL (high density lipoprotein): cholesterol clean up crew
What is Atherosclerosis and Plaque Process?
Atherosclerosis:
- Foam cells form a fatty streak and calcify
- Narrowed arteries are at-risk for clots
Plaque Process:
- Minerals, platelets, and oxidized LDL form plaque
What is the diet to reduce the risk of heart disease?
- Low in saturated, trans fats, sugar, and refined grains
- High ratio of omega 3:omega 6
- Lots of plant-based foods
What heart rate should you keep it below to reduce risk of heart disease?
<90/<60
What are the healthy lipid levels for cholesterol, LDL, HDL, and Triglycerides?
- Total blood cholesterol <200
- LDL <100
- HDL >60
- Triglycerides <100
What is Hydrogenation?
- The process that adds hydrogens to unsaturated fat to increase its shelf life
- Results in a trans fat
What is the recommended fat intake?
- AMDR 20%-30% calories from fat
- Consume <10% of calories from saturated fat
- Consume fish twice a week