week 8 - weight + weight management Flashcards

1
Q

take home messages for weight management + obesity

A
  • obesity reached epidemic amounts
    • caused by complex range
      of factors that vary across
      populations

proper weight management involves a healthy relationship w/ food and physical activity - have psychological and environmental control

short term solutions to weight issues are rarely effective in long temr
- FAD diets aren’t usually
sustainable

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2
Q

body composition

A

Proportion of fat-free mass and body fat in ur body ideal for overall health

Divided into fat-free mass and body fat
- FFM= body’s non-fat tissues: bone, water, mucle, connective tissue
- Fat is in nerves, brain, heart, lungs, liver - main source of stored energy in body -cushions body organs and helps regulate body temp

Whats important for health is proportion of body’s total weight - percent body fat - basically being overfat

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3
Q

Subcutaneous fat

A

just beneath skin, protective for diseases. The normal physiological buffer for excess energy intake - when storage capacity is exceeded, fats accumulates in other places

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4
Q

visceral fat

A

embedded in mesentery (tissues that connect intestines to back of abdominal wall) surrounding abdominal organs. Excess linked to CVD and other diseases. 10-20% of total fat in men and 5-8% in W

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5
Q

ectopic fat

A

located on or within organs, liver, heart, brain. Increases risk for metabolic syndrome, CVD and stroke

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6
Q

obesity

A

The condition of having an excess of non-essential body fat; having a body mass index of 30kg/m2 or greater.

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7
Q

BMI

A

A measure of relative body weight that takes height into account and is highly correlated with more direct measures of body fat; calculated by dividing total body weight (in kilograms) by the square of height (in metres).

Based on concept that weight should be proportional to height - frequently used in studies involving health risks associated w/ body weight

Does not distinguish between fat weight and fat-free weight , can be inaccurate for some groups (short ppl, muscular athletes)

Divide body weight by square of ur height

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8
Q

how many adults are overweight or obese in canada

A

approx 64%

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9
Q

how many kids (5-17) and indg adults are overweight ot obese

A

kids
- 30%

indg
- 67%

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10
Q

t/f obesity is becoming known as a chronic disease

A

t

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11
Q

risks of excess body fat

A
  • Obesity reduces life expectancy by up to 14
    years; causes 1/10 premature adult deaths
  • Associated with ↑ risk of CVD and diabetes
  • Associated with ↑ risk of many cancers, impaired immune function, diseases of the kidney and gallbladder, bone and joint
    disorders, impotence, incontinence, pregnancy
    risks, psychological disorders
  • Also, risks associated with very low weight
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12
Q

what are the types of body fat

A

essential and risky fat

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13
Q

essential fat

A

Amount of fat necessary for maintaining bodily functions
* 3% of male weight
* 12% of female weight
* Essential for
reproductive capacity
* Hormonally-determined
* Not associated with
health risk

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14
Q

risky fat

A

Non-essential
* Visceral or subcutaneous
adipose
* Depends on sex, age, diet, activity
* Mobilized by energy
demand
* Hormonally-determined

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15
Q

apple (android) and pear (gynoid) shape

A

overweight men tend to have apple

overweight women tend to have pear shape

Subfat in lower body, hips, upper thighs, butt (pear)

Excess visceral + ectopic fat - upper body (apple)

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16
Q

review obesity + diabetes slide

A
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17
Q

evaluating body weight + composition

A
  • Height-weight charts
  • Hydrostatic weighing
  • Skinfold measurements
  • Circumference measurements
  • Electrical impedance
  • Scanning (e.g. MRI) methods
  • BMI – simplest and most broadly applicable

smart scales

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18
Q

height-weight charts

A

Range of ideal recommended body weights associated w/ lowest mortality for ppl of certain sex, age, and height - can be highly inaccurate - only provide an indirect measure of body fat

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19
Q

hydrostatic

A

One of most accurate techniques for analyzing body comp
- Submerged under water and percent body fat is calculated from body density
- Muscle has higher density and fat lower than water so ppl with more fat tend to float and weigh less under water - lean ppl tend to sink and weigh more under water

Bod pod uses air instead of water
- Sits in chamber and computerized pres

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20
Q

skinfold measurements

A
  • Measures thickness of fat under skin
    ○ Taken at sev sites on body and put into formulas that calculate body fat %s

Accuracy is dependent on expertise of practitioner

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21
Q

circumference measurements

A
  • Wait circum and waist to hip ratio used to measure abdominal obesity and predict health risk
  • W waist circum over 40 inches and over 35 inches for men is associated with increased risk for chronic disease

Waist to hip involves measuring the waist and hip diameters, then dividing the waist value by hip value

22
Q

electrical impedance

A
  • Electrodes attached to body and harmless electrical current is transmitted from each electrode
  • Electrical conduction through the body favours path of fat-free tissues over fat tissues

Computer calculates fat %s from measurements of current

23
Q

scanning (MRI) methods

A
  • Very accurate but expensive

CT, MRI or DEXA

24
Q

what determines ur weight

A

energy balance

25
what is energy balance
energy input – energy output = +ve/-ve energy balance in - food (carbs, lipids, proteins) - alcohol out - basal metabolism - thermogenesis - physical activity largely determined by genetics
26
energy expenditure
total amount of energy a person uses in a day for various physiological functions and physical activity. It's a crucial factor in maintaining a healthy weight and overall well-being
27
basal (resting) metabolic rate (BMR/RMR)
measure the amount of energy your body needs to function at res BMR represents the absolute minimum calories needed for basic functions in a controlled environment RMR includes the energy expended during light, everyday activities at res changes based on: – rough estimate = 10 x your weight in lbs – genetics (BMR determined by genetics) – higher lean (muscle) mass (promotes BMR) – exercise and physical activity – greater height and weight (inreases BMR – male sex, other factors * Thermic effect of food * Physical activity
28
thermic effect of food
increase in metabolism that occurs after consuming food. It's the energy your body expends to process the food you've eate detemines energy expenditure
29
physical activity and BMR/RMR
Regular exercise, particularly strength training, can increase muscle mass, which in turn elevates BMR and RMR, meaning your body burns more calories even when you're not actively exercising determines energy expenditure
30
how to determine amount of cals u burn
basal metabolic rate taking weight in lbs and x by 10
31
if u lay in bed all day will u still get hungry?
yes bc ur body uses energy to complete its functions
32
energy intake: what determines how much u eat
* Hunger: Need to eat (physiological) - Influenced by 12+ internal signals - tells hypothalamus its time to eat or not - influences appetite * Appetite: Desire to eat (not always physiological) - Influenced by sight, smell, thought of food - main thing that determines what we need * Satiety: Fullness (physiological) - Eating voluminous foods, mixed-nutrient meals, fibrerich foods and eating slowly all promote satiety - It takes ~20 min for your brain to receive the message that your stomach is full - Eat slowly and in small portions
33
other factors influecning energy intake
psychological state environment
34
what may be main issue around obesity
abnormal appetite normally from genetics
35
causes of obesity
* Physical activity levels are declining, beginning in childhood and continuing through life * We spend an average of 9.7 hours a day being sedentary! * We live in an obesogenic environment that can promote the overconsumption of calories * People living in areas with few grocery stores, lots of fast-food outlets and few opportunities for physical activity are at an increased risk * Psychosocial factors * Policy changes are one way to help curb obesity
36
another main reason why ppl consume too many cals is...
dont know how many cals are in the foods they contain
37
foresight model
aims to define and connect factors underlying obesity things affecting appetite lots of interelationships between thing - stree promoting appetite - obesity - stress grouped in 7 causal notes
38
foresight model causes of obesity
food consumption - eating too many cals and increasing fat storage * Food Production: High calorie, unhealthy foods are often cheap and accessible; large portion sizes * Physiology: Hormonal imbalances, genetics, metabolic problems (e.g. thyroid; <2% of cases) * Individual Physical Activity: Level of PA, ability to exercise (e.g. due to cost of a gym membership) * Environmental Physical Activity: Does the environment promote PA (e.g. bike paths, appropriate weather)? * Individual Psychology: Depression, anxiety, addiction can contribute * Social Psychology: Friends and family can affect eating patterns
39
danger of obesity
- stroke - CVD - forms of cancer -type 2 diabetes - hypertension -high blood choles - psychological disorders (depression)
40
ideal weight
* Medical definition: the weight at which one’s health risk is lowest * Lifestyle should be your guide in determining ideal weight * Instead of focusing on a particular weight, focus on eating moderate amounts of healthful foods and being physically active * Letting a healthy lifestyle determine your weight can help avoid unhealthy eating habits and negative body image
41
t/f diet culture is everywhere u look
T promotes behaviours that aren't sustainable
42
dieting feedback loop
start crazy diet (juice cleanse) (FAD diet) u start to loose weight (due to promoting caloric deficit) - water loss, minimal fat loss hormonal, metabolic changes - thinking more about food u "cant" eat increases appetite, fat storage and inability to maintain diet then, weight gain finally, weight satisfcation and back to crash diet
43
guidelines for weight control (1 sensible diet)
* Goal: Reduce total caloric intake * Should not be too drastic * Minimum of 1,200 kcal/day * Eat filling and nutrient- dense foods; try to avoid empty calories * Protein, fat, and fibre are more filling than foods that are high in simple carbohydrates * Eat plenty of fruits and vegetables * Calorie tracking may help (journaling, or an app like MyFitnessPal)
44
guidelines for weight control (2 change in eating habits)
* Goal: Reduce total caloric intake * Use smaller plates * Try to eat slowly * Wait a little while before eating more * Leave tempting foods out of sight * Be conscious of environmental cues that promote consumption * Avoid shopping when hungry * Avoid mindless eating
45
guidelines for weight control (3 psychological modification)
* Self-efficacy: belief in one’s ability to change * May need to change relationship with food/PA so they are positive concepts * Identify triggers, how to cope with situations that may promote overeating * Challenge negative patterns of thoughts and replace them with healthier ones * Support is key: Friends/family, groups, networks/blogs or apps (e.g. MyFitnessPal)
46
guidelines for weight control (4 physical activity)
* Goal: Increase caloric expenditure * Increases basal metabolic rate * Body becomes more efficient at burning calories * Helps maintain muscle mass, reduce fat mass * Helps relieve depression, anxiety * May help promote self esteem * Regularity is key: find activities you enjoy, and people you enjoy doing them with * Duration is more important than intensity for weight reduction
47
what is an eating disorder
* A serious disturbance in eating patterns or behaviours, characterized by a negative body image and concerns about body weight/fat * Common feature: dissatisfaction with body image and weight often due to distorted thinking, perfectionist beliefs, unreasonable demands for self-control, and excessive self-criticism * Among teens, 50% of females and 30% of males use unhealthy behaviours (e.g. skipping meals, vaping, vomiting, fasting, taking laxatives)
48
anorexia nervose
* Individual does not eat enough to maintain adequate body weight * Associated with: – distorted body image – intense fear of weight gain – feeling that food is the enemy – purging/over exercising * Risks: amenorrhea, intolerant to cold, low BP; CV, GI, endocrine and skeletal disorders * Leading mortal psychiatric disorder: 1 in 10 die of starvation
49
bulimia nervosa
* Episodic binge eating followed by purging (vomiting or laxatives) * Often involves: – Binging, often thousands of calories and often in secret – Feeling ashamed, disgusted, and fearful of weight gain; purging * Risks: erosion of tooth enamel, damage to esophagus, stomach; dehydration, disturbed salt balance; kidney, liver, heart damage; depression
50
binge eating disorder
recurrent episodes of binging - eating in discrete period of time and sense of lack of control when eating associated w/ - eating rapidly - eating until uncomfy full - eating large amounts when not rlly hungry - eating alone due to embarassment of food consumes present distress regarding eating binging - 2 days a week for 6 months not associated w/ regular use of inappropiate copensatory behavs (purging, fasting, excessive exercise) doest occur during course of anorexia or bulimia
51
treatments for eating disorder
* Must address problematic eating behaviours and the misuse of food to manage stress and emotions * Anorexia: averting crisis by restoring body weight; addressing psychological aspects of disorder * Bulimia and binge eating: stabilizing eating patterns; identifying and changing behaviours that led to disordered eating; improving coping skills * Concurrent issues, such as depression or anxiety must also be addressed