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Healthy Lifestyle and Diet
William P. Wattles
Psy 314 Behavioral Medicine
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Dose Response relationship
• A quantitative relationship between the dose of a drug and the degree of an effect caused by the drug
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Causation
• Sadly, there is no sufficient way to prove that an association between a factor and a disease is a causal relationship.
• http://www.med.uottawa.ca/sim/data/Causation_e.htm
• Strength• Consistency• Specificity• Temporality• Dose response
(biological gradiant) • Plausibility• Coherence
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• In British Journal of Sports Medicine, UK researchers found an increase in regular exercise is linked to improved academic performance amongst teens.
• The academic improvements were seen over the long term, with the results indicating a dose-response effect, meaning more intensive exercise produced greater effects on test results. 5
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Dose Response
• The presence of a dose response relationship makes it less likely that a third variable explains the relationship thus providing support for a causal interpretation.
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Unintended injury
• From text: “The terms injury and trauma are replacing use of the word accident to underscore the fact that most injuries are not random, unavoidable events—they are predictable and preventable.”
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Analyze nutrition from a chain restaurant.
• Choose a restaurant not chosen by someone else. First come, first served.
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Bring a Calculator to Class
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Tuesday
• Bring food labels to class
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Lifestyle
• Refers to habits that make up the way that we live.
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Lifestyle examples
• exercise• diet• no smoking• no drug/alcohol
abuse• stress management• meaningfulness
• wear seat belts• take medication • follow medical
advice • sleep• assertiveness• nonviolence • play• social
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Healthy Lifestyle
• Increases the likelihood of a long, disease-free life.
• Deals with risk factors. How to put the odds in your favor.
• Identification of factors under our control that predict death and illness.
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Idiographic vs Nomothetic data
• Idiographic refers to the individual.• Nomothetic - Of or relating to the study or
discovery of general scientific laws.• When we use nomothetic data we gain and.
We lose specificity to the individual but we gain in that we can now generalize to others.
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Diet
• Pattern of everyday eating habits and food selection which result in a specific nutrient consumption
• A good diet:– Provides necessary nutrients and calories– Avoids excessive or harmful elements
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Dietary goals
• 1. Nutrition-provide body with essentials• 2. Weight control -Obesity correlates with
many illnesses• 3. Reduce Coronary heart disease• 4. Reduce hypertension• 5. Maximize Athletic performance
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Seven Dietary Guidelines.
• 1. Eat a variety of foods.• 2. Maintain a healthy weight• 3. Choose a diet low in fat, saturated fat and
cholesterol.• 4. Choose a diet with plenty of vegetables,
fruits and grain products.• 5. Use sugar in moderation
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Seven Dietary Guidelines
• 6. Use salt and other forms of sodium in moderation.
• 7. If you drink alcoholic beverages do so in moderation.
• In moderation all foods can fit into a healthy diet.
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Nutrition
• The process by which materials from the environment are taken up by the body in order to provide the nutrients and energy necessary to keep the body alive and healthy.
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Nutrients
• Components in the food we eat that the body needs to be alive and healthy.
• Carbohydrates• Fats• Proteins• Vitamins
• Minerals• Trace elements• Dietary fiber• Water
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Energy
• Primary need for food is to provide energy .• The ultimate source of energy is the sun• Plants synthesize complex organic
substances from light and inorganic materials such as carbon dioxide and water.
• We get energy either directly from the plants or via animal tissue that got it from plants.
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Digestion
• The process by which food is converted into useful proteins, fats, carbohydrates, vitamins and minerals.
• Useful components of food converted into particles that can be absorbed rest is excreted.
• These molecules are carried by the blood to all cells for energy and repair
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Protein
• Large molecules that are broken down into simply units called amino acids.
• The body needs 21 amino acids.• 8 essential amino acids. Cannot be made by
the body and must be eaten in the diet.• These amino acids critical for restoring the
body tissues, hormones and enzymes.
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Carbohydrates CHO
• Provide the energy for the body• Complex carbohydrates-contain vitamins,
minerals and fiber in addition to energy• Simple sugars. Contain CHO but little else
thus, less nutritious• Also used to synthesize important
compounds in the body
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Fats
• Basic component is triglycerides. – Saturated– Monounsaturated– Polyunsaturated
• Average person needs about one tablespoon a day but gets about 6 per day.
• Fat need to produce energy and synthesize important compounds and tissue.
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Cholesterol
• A type of fat found in animal fat and produced by the body.
• High cholesterol linked to cardio-vascular disease. Major cause of death in the U.S.– heart disease– stroke
• Saturated fat in the diet raises levels of cholesterol
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Dietary goals
• 1. Nutrition-provide body with essentials• 2. Weight control -Obesity correlates with
many illnesses• 3. Reduce Coronary heart disease• 4. Reduce hypertension• 5. Maximize Athletic performance
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Diet
• Pattern of everyday eating habits and food selection which result in a specific nutrient consumption
• A good diet:– Provides necessary nutrients and calories– Avoids excessive or harmful elements
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Nutrition research
• The role of fat tissue in the cholesterol lowering and the pleiotropic effects of statins – statins activate the generation of metabolically more capable adipocytes – Medical Hypotheses, Volume 64, Issue 1, 2005,
Pages 69-73
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Nutrition research
• Serum lipids of physically active adults consuming omega-3 fatty acid–enriched eggs or conventional eggs– Nutrition Research, Volume 24, Issue 9,
September 2004, Pages 731-739
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Nutrition research
• Effect of reduced maternal protein consumption during pregnancy in the rat on plasma lipid concentrations and expression of peroxisomal proliferator–activated receptors in the liver and adipose tissue of the offspring– Nutrition Research, Volume 24, Issue 8, August
2004, Pages 639-646
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Review Articles
• Common gene polymorphisms and nutrition: emerging links with pathogenesis of multifactorial chronic diseases (review)– The Journal of Nutritional Biochemistry,
Volume 14, Issue 8, August 2003, Pages 426-451
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Dietary Guidelines developed by USDA
• Represent the best, most current advice for health American 2 years old and older.
• Represent a consensus of nutrition experts
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Dietary Guidelines for AmericansUSDA
• http://www.usda.gov/cnpp/• Healthful diets contain the amounts of
essential nutrients and calories needed to prevent nutritional deficiencies and excesses.
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Dietary Guidelines for AmericansUSDA
• Healthful diets also provide the right balance of carbohydrate, fat, and protein to reduce risks for chronic diseases, and are a part of a full and productive lifestyle. Such diets are obtained from a variety of foods that are available, affordable, and enjoyable.
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The food pyramidThe food pyramid
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1. Nutrition• Choose most of your foods from the:
– grain products group (6-11 servings)– the vegetable group (3-5 servings)– the fruit group (2-4 servings).
• Eat moderate amounts of foods from the:– milk group (2-3 servings)– meat and beans group (2-3 servings).
• Choose sparingly foods that provide few nutrients and are high in fat and sugars.
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Vitamins
• Vitamins are chemicals that the body cannot make which are needed for many functions in the body. They don't provide calories but participate in reactions that release energy from foods.
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Percentage of total energy intake
• Present• Fat 42%• Protein 12%• Carbohydrate 46%
• Goal• Fat 30%• Protein 10%• Carbohydrate 60%
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Food Labels
• Recent big change by U. S. Government.• Bring labels to class.
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• http://www.cfsan.fda.gov/~dms/foodlab.html
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Percent
• Percent of calories from fat =/= Percent of daily allowance of fat
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Percent allows us to compare foods
• Potato with Bacon• fat grams 9• Santa Fe Chicken• fat grams 10
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Percent allows us to compare foods
• Potato with Bacon• 182 9 81• Santa Fe Chicken• 425 10 90
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Percent allows us to compare foods
• Potato with Bacon• 182 9 81 45%• Santa Fe Chicken• 425 10 90 21%
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Main StreetCurarrehue, Chile
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Choose a Diet Moderate in Sugars
• The problem with sugar is that it is added to foods that offer little else from a nutritional point of view.
• Cream- filled sandwich cookies are indeed delicious, but they don't provide much besides calories.
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Choose a Diet Moderate in Sugars
• Another issue is holes in your teeth if the sugar sticks to them.
• Many of the other claims that sugar causes hyperactivity, criminal behavior, or obesity are simply not supported by peer-reviewed research.
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Choose a diet low in fat
• Some dietary fat is needed for good health. Fats supply energy and essential fatty acids and promote absorption of the fat-soluble vitamins A, D, E, and K.
• Most people are aware that high levels of saturated fat and cholesterol in the diet are linked to increased blood cholesterol levels and a greater risk for heart disease.
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To reduce fat intake
• Use fats and oils sparingly. • Use the Nutrition Facts Label to help you
choose foods lower in fat, saturated fat, and cholesterol.
• Eat plenty of grain products, vegetables, and fruits.
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To reduce fat intake
• Choose low fat milk products, lean meats, fish, poultry, beans, and peas to get essential nutrients without substantially increasing calorie and saturated fat intakes.
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Functional Foods
• The food has some identified value leading to health benefits, including reduced risk for disease
• Journal of the American Dietetic Association
• Volume 104, Issue 5 , May 2004, Pages 814-826
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2. Dieting for Weight loss
• Fundamentally, weight gain results when calories consumed are greater than calories expended.
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Pecan Festival
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• Energy Balance occurs whenEnergy intake=Energy output
• If energy intake exceeds output we gain weight, the extra is stored as fat.
• If energy intake is less than output then we gain weight as the body converts fat and other tissue for energy.
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Calories
• Unit of heat; The heat required to raise 1 gram of water 1 degrees centigrade
• A Calorie (or kilocalorie) describes the available energy in food. It is the amount of heat required to raise the temperature of 1,000 grams (Kilogram) of water by 1 degree Celsius
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Calories
• 3500 calories = 1 pound of fat• A deficit of 112 calories a day = 1 pound a
month weight loss.
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Calories per gram
• Protein 4• Carbohydrate 4• Fat 9
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Parents underestimate calories in fast food
• the average meal purchased contained 733 calories, and 21% contained more than 1,000 calories,
• the parents estimated an average of only 562 calories per meal, with 72% underestimating the actual content,
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Teens underestimate calories
• Of those ages 11 to 20 surveyed outside of fast food chains in four U.S. cities, 80% underestimated the actual calorie content, and 30% misjudged the amount by at least 500 calories,
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Calories needed per day
• Men• Sedentary
– 2510
• Moderately active– 2900
• Very active– 3350
• Women• Most
– 2150
• Very active– 2500
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Components of Energy Expenditure
• Resting metabolism 60-70%• Physical activity 20-30%• Thermal effect of food 10%
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Caveat
• Assume a man who burns 2,510 calories per day.
• If he eats 2,800 calories of CHO and Protein and zero fat he will gain weight.
• If he eats 2,200 calories of pure fat per day he will lose weight.
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Percentage of total energy intake
• Present• Fat 42%• Protein 12%• Carbohydrate 46%
• Goal• Fat 30%• Protein 10%• Carbohydrate 60%
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Obesity Epidemic
• 2/3 of Americans are overweight• 1 in 3 Americans are obese
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Weight loss dilemmas
• Weight alone not a good measure– Lean muscle weighs
more– Water levels fluctuate
• Most interventions work short-term– Behavior change– Metabolic shift
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Body Mass Index
• Body weight in kilograms divided by height in meters squared.
• Compute your BMI
• BMI Categories: • Underweight = <18.5 • Normal weight =
18.5-24.9 • Overweight = 25-
29.9 • Obesity = BMI of 30
or greater
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• Percentage of Body Fat– Measured by
immersion
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Fad Diets
• Severely restricting or eliminating a food category may be nutritionally unwise.
• The Cookie Diet
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The Diet Industry
• Over 26,000 weight loss diets have been published in this century.
• Overweight people spend close to $40 billion dollars a year on weight control.
• “Data is not the plural of anecdote.”
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Fad diets
• Fad diet page• Liquid diets• The Damage-Control
Diet• The All-You-Can-Eat
Soup Diet
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Low Carbohydrate or Protein Diet
• Current fad diet.– Low carb no consistent
meaning
• Technical mumbo jumbo
• Profitable: $14.99 bread ice cream and fudge sauce $73
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Testimonials and Case Studies
• Dan & Karen's Story: 11 months and 136 pounds ago. Atkins Diet
• Jennifer Kushnier, 29 Pounds lost: 20 in 16 weeks. South Beach Diet
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“Low Carb” diets
• Most research no controls• Weight loss attributed to calorie reduction
not eating plan• Weight loss advantage lost after several
months.
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Vegetable
• any of various herbaceous plants cultivated for an edible part such as the fruit or the root of the beet or the leaf of spinach or the seeds of bean plants or the flower buds of broccoli or cauliflower
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Fruit
• The part of a plant that grows where a flower used to be, after the flower was pollinated and died. The fruit contains the seeds, which can grow new plants. Fruits are often fleshy with juices and nutrients for animals to eat.
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Effective weight loss diet
• To be effective an diet must be one that a person will be able to maintain throughout life.
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Weight Control
• Calories count, no matter what you read in the press. The laws of thermodynamics have not been reversed.
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Weight Loss
• The typical weight loss program achieves an average of ten percent reduction in weight.
• A survey of almost 400 obese individuals in the September 24, 2001 issue of the Archives of Internal Medicine revealed that expectations are often unrealistic.
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Weight Loss
• The average starting weight of the subjects was 240 lbs their goals were:– dream weight 142 lbs (41%)– happy at 160 lbs (33%) – disappointed at 198 lbs (18%)
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3. Reducing heart disease
• Cholesterol Waxy, fat-like substance essential for life.
• Too much leads to heart disease.• Serum of blood cholesterol is the level of
blood circulating in the blood stream.• Related (but not perfectly) to dietary
cholesterol and saturated fat.
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Cholesterol
• Cholesterol raised by eating saturated fats and trans fats.
• Dietary modification preferable to medication.
• Lowering overall dietary fat tends to lower saturated and trans fats.
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Cholesterol
• High >240• Borderline high 200-239• Desirable <200• Ratio of total cholesterol to HDL may be a
better predictor.• Levels of trigylcerides also critical
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4. Hypertension
• Diet, medication, relaxation and exercise used to treat hypertension.
• Dietary interventions involve– sodium restriction– weight loss
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Sodium
• A higher intake of dietary sodium is a strong independent risk factor for CHF in overweight persons.
• Arch Intern Med. 2002;162:1619-1624
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Sodium
• Not all people appear to be salt sensitive.• Some estimates suggest that 26% of normal individuals are
salt-sensitive. • Most importantly it appears that the rate of salt-sensitivity
is nearly twice as great (51%) in individuals who are "hypertensive".
• The highest values are found in black individuals who are hypertensive (73%).
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JAMA. 1985;253(5):657-664.98
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Dietary success
• Langford et al. (1985)• 500 hypertensive patients had been on
medication 5 years.• Subjects able to remain in the normal range
without medication:– 78% of those who restricted sodium intake– 72% of those who reduced weight (low-fat,
high carbohydrate diet)
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5. Diet for athletic performance
• Recovery from exertion and injury• Energy
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•At 190 M.P.H., Who Needs a Spare Tire?
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High protein intakes will not increase muscle
• “There is little scientific evidence that the consumption of large amounts of protein supplements will have any beneficial effects on muscle hypertrophy, muscular strength or physical performance, quite irrespective of the claims of the manufacturers.”
• Wooton, S. Nutrition for Sport
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Maintaining glycogen reserves
• One of the greatest problems facing the athlete is achieving adequate glycogen repletion to maintain normal energy reserves.
• Following a ten-mile run followed by some interval training glycogen stores in the muscles of the legs decreased by 60-70%
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Gycogen restoration following training
0
20
40
60
80
100
120
A 375gCHO
B 525gCHO
C 650 gCHO
Before
After
24 hours
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Wendy’s
• Actually, Wendy’s does have quite a few healthy items in their menu, but they may not be the ones that most people would assume to be healthy.
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Wendy’s
• There are five salads on the menu at Wendy’s, and most people would assume that all salads are healthy. Unfortunately, only one of these salads contains less than 30% of its calories from fat.
• The Chicken BLT Salad (the one I usually order) contains 47% calories from fat, 14% calories from carbs and 39% calories from proteins.
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Wendy’s
• One of the items that is unique to Wendy’s, and is not offered at other fast food restaurants is the baked potato. A plain baked potato has no fat at all, 86% calories from carbs and 14% calories from proteins. Even the loaded baked potatoes aren’t high in fat content. A broccoli and cheese baked potato has only 9% calories from fat,
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Bojangles
• … it appears that Bojangles’ can not be considered to be a “health-conscious” restaurant. In fact, the restaurant chain fails to offer but only a few menu items that are low in fat.
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Bojangles
• The healthiest meal that Bojangles’ offers customers is a Grilled Filet Sandwich without mayonnaise and a side of green beans. This is the one meal that will ensure that the customer stays within the suggested daily caloric intake from fat range of 30%.
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Bojangles
• A Grilled Filet Sandwich that does not have mayonnaise on it gets only 19 percent of its calories from fat; however, if the customer adds mayonnaise, that percentage increases to 43%.
• This meal will be the best option because it is not only low in fat, but it will also be delicious because of the extra spices that Bojangles’ tends to use when preparing food.
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Bojangles
• The smoked sausage biscuit, a popular breakfast biscuit at Bojangles’, gets 61% of its calories from fat. This biscuit only costs ninety-nine cents but is high in fat.
• Although it has great food that is delicious, it does not have the healthiest menu items.
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What counts as a serving?
• Grain Products Group (bread, cereal, rice, and pasta) – 1 slice of bread – 1 ounce of ready-to-eat
cereal – 1/2 cup of cooked
cereal, rice, or pasta
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What counts as a serving?
• Vegetable Group – 1 cup of raw leafy vegetables– 1/2 cup of other vegetables -- cooked or chopped raw – 3/4 cup of vegetable juice
• Fruit Group – 1 medium apple, banana, orange – 1/2 cup of chopped, cooked, or canned fruit – 3/4 cup of fruit juice
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What counts as a serving?
• Milk Group (milk, yogurt, and cheese) – 1 cup of milk or yogurt – 1-1/2 ounces of natural cheese – 2 ounces of processed cheese
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What counts as a serving?
• Meat and Beans Group (meat, poultry, fish, dry beans, eggs, and nuts) – 2-3 ounces of cooked lean meat, poultry, or fish– 1/2 cup of cooked dry beans or 1 egg counts as
1 ounce of lean meat. – Two tablespoons of peanut butter or 1/3 cup of
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Definitions of terms used on labels
• Free. Contains no amount of, or a physiologically inconsequential amount. Calorie free means less than 5 calories per serving.
• Low. Foods that can be eaten frequently without exceeding dietary guidelines.– low fat. 3 grams or less per serving– low sodium 140 mg or less per serving
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Definitions
• Lean. Less that 10 grams of fat, 4.5 g of saturated fat and less than 95 mg of cholesterol
• High. Contains at least 20 percent of the Daily Value
• Good Source. One serving contains 10-19 % of Daily Value for a nutrient.
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Definitions
• Reduced. For a nutritionally altered product that is 25% less of a nutrient or calories than the reference product.
• Light either– 1/3 the calories, 1/2 the fat of the reference
food– Sodium reduced 50%
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Milk
whole milk 2% 1% skimfat grams 8 5 3 0CHO 12 12 12 12protein 8 8 8 8
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Milkwhole milk 2% 1% skim
fat grams 8 5 3 0CHO 12 12 12 12protein 8 8 8 8
fat cal 72 45 27 0CHO cal 48 48 48 48Prot cal 32 32 32 32total cal 152 125 107 80
% from fat 47% 36% 25% 0%
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Milk
• Fat-Reduced Milk Products Join the Food Labeling Fold
• 2 percent milk will become known, for example, as "reduced fat" or "less fat" instead of "low fat"
• 1 percent milk will remain "low fat" or become, for example, "little fat"
• skim will retain its name or be called, for example, fat-free, zero-fat, or no-fat milk.
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October 6, 1999 editionof JAMA
• analysis of 570 stroke patients among study populations of over 100,000 people found that after controlling statistically for the standard cardiovascular risk factors, those eating the most fruits and vegetables had a 30% reduction in the risk of stroke.
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5 servings a day
• These people averaged more than 5 servings of fruits and vegetables daily. This is much higher than the typical person so these groups’ experiences may not be representative of the rest of the population.
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Cruciferous vegetables
• Crucifer. Any of various plants in the mustard family (Cruciferae or Brassicaceae), which includes the alyssum, candytuft, cabbage, radish, broccoli, and many weeds.
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Legumes
• 1. A pod, such as that of a pea or bean, that splits into two valves with the seeds attached to one edge of the valves. b. Such a pod or seed used as food.
• 2. A plant of the pea family.
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Fiber
• A study of 2900 healthy adults found that dietary fiber intake was associated with lower levels of body weight, body-mass index, weight gain, fasting insulin, blood pressure, triglycerides, LDL-cholesterol, and fibrinogen (a blood clotting factor). These are all desirable
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Correlation not causation
• People who ate the most fiber (about 25 grams per day) weighed 8 pounds less than those who ate the least (about 12 grams per day). However, people eating high fiber also smoked less, were more physically active, were more likely to be women, and were twice as likely to take vitamin supplements.
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Nutrition analysis on the fly
• Three times fat calories should be less than total calories.
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IAT
• Implicit Association Test
• IATs measure associations between concepts: preference for one category over another
• Age IAT generally shows that most individuals have an implicit preference for young over old, regardless of the age of the person taking the IAT
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IAT
• the Race IAT shows that most White individuals have an implicit preference for Whites over Blacks.
On the other hand, only half of Black individuals prefer Blacks over White
• “There is nothing more painful to me at this stage in my life than to walk down the street and hear footsteps and start thinking about robbery. Then look around and see
• somebody White and feel relieved.”
• —Jesse Jackson
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IAT
• The results contrasted sharply with what most people said about themselves -- that they had no biases. The tests also revealed another unsettling truth:
• Minorities internalized the same biases as majority groups. Some 48 percent of blacks showed a pro-white or anti-black bias;
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Malcolm Gladwell
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IAT
• But the tests do not measure actions. The race test, for example, does not measure racism as much as a race bias. Banaji is the first to say people ought to be judged by how they behave, not how they think.
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Harvard's Mahzarin Banaji
• Thanks so much for sharing your experience. We have received some pretty moving reactions, not all of which start out positively!
• I am indeed interested in your experience and the test result. We have been trying interventions of a more minimal sort that also produce such effects.
• All the best and thanks again. --mrb
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Food IAT?
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The End
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Should I discuss something that involves race and politics?
A. Yes
B. No
C. Maybe
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Was it a bad idea to discuss this subject the way I did?
A. Yes
B. No
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Update on vitamins
• Dietary Reference Intakes for Vitamin A, Vitamin K, Arsenic, Boron, Chromium, Copper, Iodine, Iron, Manganese, Molybdenum, Nickel, Silicon, Vanadium, and Zinc (2001)
• http://www.nap.edu/books/0309072794/html/