Upload
fruma
View
30
Download
1
Embed Size (px)
DESCRIPTION
Chapter 9 Energy Balance and Healthy Body Weight. Nutrition: Concepts & Controversies, 12e Sizer/Whitney. Learning Objectives. Delineate the health risks of too little and too much body fatness, with emphasis on central obesity and its associated health risks. - PowerPoint PPT Presentation
Citation preview
Chapter 9Chapter 9
Energy Balance and Healthy Energy Balance and Healthy Body WeightBody Weight
Nutrition: Concepts & Controversies, 12e Nutrition: Concepts & Controversies, 12e Sizer/WhitneySizer/Whitney
Learning ObjectivesLearning Objectives
Delineate the health risks of too little and too much body fatness, with emphasis on central obesity and its associated health risks.
Describe the roles of BMR and several other factors in determining an individual’s daily energy needs.
Learning ObjectivesLearning Objectives
Calculate the BMI when given height and weight information for various people, and describe the health implications of any given BMI value.
Compare and contrast the roles of the hormones ghrelin and leptin in appetite regulation, and name several other influences on both hunger and satiety.
Learning ObjectivesLearning Objectives
Discuss the potential impact of “outside the body” factors on weight-control efforts.
Develop a weight-loss plan that includes controlled portions of nutrient-dense foods to produce gradual weight loss while meeting nutrient needs.
Discuss the role of physical activity in maintaining a healthy body composition.
Learning ObjectivesLearning Objectives
Defend the importance of behavior modification in weight loss and weight maintenance over the long term.
Compare and contrast the characteristics of anorexia nervosa and bulimia nervosa, and provide strategies for combating eating disorders.
IntroductionIntroduction
Health risks Overweight Underweight
Weight “control” Focus on weight Focus on controlling weight Focus on short-term endeavors
Body composition
The Problems of Too Little or Too The Problems of Too Little or Too Much Body FatMuch Body Fat
U.S. prevalence Underweight Overweight
Epidemic
Children and adolescents
Increasing Prevalence of ObesityIncreasing Prevalence of Obesity
Adult Obesity and Overweight Adult Obesity and Overweight Compared with Compared with Healthy PeopleHealthy People Target Target
Underweight, Overweight, and Underweight, Overweight, and Mortality Mortality
What Are the Risks from What Are the Risks from Underweight?Underweight?
Disadvantages Siege or famine Hospital stays Wasting disease Heart disease
What Are the Risks from Too What Are the Risks from Too Much Body Fat?Much Body Fat?
Obesity-related illnesses Dying young
Obesity vs. smoking Hypertension Central obesity Other risks
What Are the Risks from Central What Are the Risks from Central Obesity?Obesity?
Risks of visceral fat Subcutaneous fat
Adipokines Regulate inflammatory processes Central obesity causes a shift
Free fatty acids Factors affecting fat distribution
Visceral Fat and Subcutaneous Visceral Fat and Subcutaneous FatFat
How Fat Is Too Fat?How Fat Is Too Fat?
Evaluate health risks of obesity Body mass index (BMI) Waist circumference Disease risk profile
Social costs of being overfat Economic costs of being overfat
Chronic Disease Risks According to Chronic Disease Risks According to BMI Values and Waist CircumferenceBMI Values and Waist Circumference
Indicators of an Urgent Need for Indicators of an Urgent Need for Weight LossWeight Loss
The Body’s Energy BalanceThe Body’s Energy Balance
Energy budget Change in energy stores = energy in –
energy out Energy in
Foods and beverages Energy out
Varies widely Lifestyle and metabolism
The Body’s Energy BalanceThe Body’s Energy Balance
Calorie needs Monitor activity and weight Energy output
Basal metabolism (BMR)Voluntary activitiesThermic effect of food
Components of Energy Components of Energy ExpenditureExpenditure
Factors That Affect the BMRFactors That Affect the BMR
The Body’s Energy BalanceThe Body’s Energy Balance
Estimated energy requirements (EER) Reference man and woman Taller people
Need more energy Energy need diminishes with age
DRI method Gender, age, physical activity, body size
and weight, and growth
Body Weight Versus Body Body Weight Versus Body FatnessFatness
Body Mass Index (BMI) Underweight Overweight Obesity Risks follow racial lines Drawbacks
Amount or location of fat Diagnosis requirements
Measuring Waist CircumferenceMeasuring Waist Circumference
Measures of Body Composition Measures of Body Composition and Fat Distributionand Fat Distribution
Body composition Skin fold test Underwater weighing Bioelectrical impedance Dual-energy X-ray absorptiometry Each method has advantages and
disadvantages
Average Body Composition of Average Body Composition of Men and WomenMen and Women
Three Methods of Assessing Body Three Methods of Assessing Body FatnessFatness
How Much Body Fat Is Ideal?How Much Body Fat Is Ideal?
Healthy BMI range Man: 12 to 20 percent Woman: 20 to 30 percent
Declaration of being overfat Men age 40 and younger Men over age 40 Women age 40 and younger Women over age 40
The Mystery of ObesityThe Mystery of Obesity
Obesity’s cause remains elusive Hunger
Satiety Response to physiological need
Chemical messengers Stomach hormone
Ghrelin Stomach capacity
Hunger, Appetite, Satiation, and Hunger, Appetite, Satiation, and SatietySatiety
The Mystery of ObesityThe Mystery of Obesity
Appetite Initiates eating Endorphins Factors affecting
appetite
The Mystery of ObesityThe Mystery of Obesity
“Stop” signals Satiation
Food in digestive tractHormonesHypothalamus
Satiety Regulates frequency of meals
The Mystery of ObesityThe Mystery of Obesity
Leptin Adipokine hormone Appetite regulation Leptin resistance
Energy nutrients Protein provides most satiation
Inside-the-Body Causes of Inside-the-Body Causes of ObesityObesity
Metabolic theories Variations in ease of body fat gain or loss Variety of theories
Genetics Influence tendency to gain weight or stay
lean Environmental factors
Outside-the-Body Causes of Outside-the-Body Causes of ObesityObesity
External cues to overeating Available foods Human sensations Larger portions
Physical inactivity Nonexercise activity thermogenesis (NEAT) Inactivity epidemic Sitting still and death from heart disease
Outside-the-Body Causes of Outside-the-Body Causes of ObesityObesity
Built environment Can discourage physical activity
Food access Food deserts Fast food
Attain healthy body weight Diet Physical activity Behavior change
How the Body Loses and Gains How the Body Loses and Gains WeightWeight
Tissue lost or gain Depends on what you do
WaterFat or muscle
Smoking Hazards
Moderate Weight Loss Versus Moderate Weight Loss Versus Rapid Weight LossRapid Weight Loss
Gradual weight loss is preferred Fasting
Body adjustmentsSacrifice lean tissue
Death Ketosis
Break down of fat molecules
Feasting and FastingFeasting and Fasting
Moderate Weight Loss Versus Moderate Weight Loss Versus Rapid Weight LossRapid Weight Loss
Short-term fasting Seems to be tolerated Effects of deprivation
Overeat or binge eating Weight loss technique
Slowing of metabolism
Low-carbohydrate diets DRI minimum carbohydrate intake level
Weight GainWeight Gain
Energy-yielding nutrients contribute to body stores Four sources of energy
Alcohol Two types of energy stores
An excess of any food will become fat
Popular Fad DietsPopular Fad Diets
Effectiveness Both sides of the coin
Adequacy To be achieved via food, not supplements
Safety Personal responsibility
Achieving and Maintaining a Achieving and Maintaining a Healthy Body WeightHealthy Body Weight
Changing your body weight What is your
motivation? Benefits of modest
weight loss Focus on health or
fitness
Tips for Accepting a Healthy Body Tips for Accepting a Healthy Body WeightWeight
What Diet Strategies Are Best for What Diet Strategies Are Best for Weight Loss?Weight Loss?
Aim for a realistic target Reasonable goals Specific and measurable objectives
Recommended weight loss 1 to 2 pounds per week Weight maintenance
Keep records Plan your diet
What Diet Strategies Are Best for What Diet Strategies Are Best for Weight Loss?Weight Loss?
Realistic calorie intakes Nutrient needs and caloric intake
MenWomen
Adequate diets Choose sensibly
Consider a supplement Calcium
Recommended Daily Food Recommended Daily Food Intakes for Low-Calorie DietsIntakes for Low-Calorie Diets
What Diet Strategies Are Best for What Diet Strategies Are Best for Weight Loss?Weight Loss?
Manage portion sizes Reduced-calorie foods Read labels
Calorie calculations Little daily decisions add up
Energy density Low energy density
May not reflect nutrient density
Examples of Energy DensityExamples of Energy Density
What Diet Strategies Are Best for What Diet Strategies Are Best for Weight Loss?Weight Loss?
Artificial sweeteners Soft drinks and milk consumption
Meal spacing Hunger vs. appetite Importance of breakfast Night eating syndrome
Physical Activity in Weight Loss Physical Activity in Weight Loss and Maintenanceand Maintenance
Weight loss Physical activity alone
Weight maintenance Appetite effects
Suppression of appetite Heightened satiety
Other benefits Choosing activities
What Strategies Are Best for What Strategies Are Best for Weight Gain?Weight Gain?
Physical activity Resistance training
High-calorie diet Increased daily caloric intake High energy density foods
Portion sizes and meal spacing Avoid tobacco
Medical Treatment of ObesityMedical Treatment of Obesity
Obesity medications Over-the-counter (OTC) medications Prescription medications
Obesity surgery Extreme obesity Not a sure cure Complications
Lipectomy
Surgical Obesity TreatmentsSurgical Obesity Treatments
Herbal Products and GimmicksHerbal Products and Gimmicks
Herbals and botanicals Sold as ‘dietary supplements’
Lack of FDA approval
Other gimmicks Prohibited claims Saunas or steam baths Cellulite
Once I’ve Changed by Weight, Once I’ve Changed by Weight, How Can I Stay Changed?How Can I Stay Changed?
Lifelong commitment Cultivate habits for
a healthy weight Self-efficacy and
success keys Physical activity
Weight cycling
Behavior Modification for Weight Behavior Modification for Weight ControlControl
Behavior modification Change behavior Change thought processes
Food and activity diary Don’t attempt to modify all behaviors at once
A Sample Food and Activity DiaryA Sample Food and Activity Diary
Behavior Modification for Weight Behavior Modification for Weight ControlControl
Modifying behaviors Eliminate inappropriate cues Suppress cues Strengthen cues Repeat the desires behaviors Emphasize negative consequences Emphasize positive consequences
Establish baseline Cognitive skills
The Perils of Eating DisordersThe Perils of Eating Disorders
Controversy 9
IntroductionIntroduction
Eating disorders Anorexia nervosa Bulimia nervosa Binge eating
disorder Young women
All people Beginnings of
disorders
Society’s InfluenceSociety’s Influence
Many causes to eating disorders Societal pressure for thinness
Distorted body image
Media messages Unrealistic ideals
Dieting as risk
Eating Disorders in AthletesEating Disorders in Athletes
Motivations Risk factors
Male and female athletes Female athlete triad
Three medical problems Male athletes and eating disorders
Muscle dysmorphia
The Female Athlete TriadThe Female Athlete Triad
Tips for Combating Eating Tips for Combating Eating DisordersDisorders
Anorexia NervosaAnorexia Nervosa
Characteristics Cannot recognize condition
Role of the family Self-starvation Physical perils
Damage to whole body Death
Treatment
Criteria for Diagnosis of Anorexia Criteria for Diagnosis of Anorexia NervosaNervosa
Bulimia NervosaBulimia Nervosa
Characteristics More prevalent than anorexia nervosa
Role of the family Binge eating and purging
Stages of a binge Methods for purging
Physical and psychological perils Treatment
Criteria for Diagnosis of Bulimia Criteria for Diagnosis of Bulimia NervosaNervosa
The Cycle of Bingeing, Purging, The Cycle of Bingeing, Purging, and Negative Self-Perceptionand Negative Self-Perception
Binge Eating DisorderBinge Eating Disorder
Differences from bulimia nervosa
Responds more readily to treatment
Criteria for Diagnosis of Binge Criteria for Diagnosis of Binge Eating DisorderEating Disorder