Adolescence Flashcards

1
Q

Age of adolescence

A

Begins at puberty and ends at adulthood; no consensus in age definition
* Early adolescents: 10 to 14 years
* Late adolescents: 15 to 19 years
* Early adulthood: 20 to 24 years

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2
Q

WHO life course model

A
  1. Fetal life
  2. Infancy and childhood
  3. Adolescence
  4. Adulthood
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3
Q

Physiological Development of adolescents

A

Puberty: physical transformation from child to adult and includes
* sexual maturation
* increased rate of gains in height and weight
* completion of skeletal growth
* changes in body composition

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4
Q

Classifications WHO Growth Charts

A
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5
Q

When does sexual maturation for females begin?

A

Starts 8 to 12 years of age and process is ~5 years in length
* big height spurt happens first
* menarche usually develops in the middle
* breast usually develops before pubic hair

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6
Q

primary driver of sexual maturation in females

A

Estrogen
* reproductive organ maturation
* secondary sex characteristics
* menarche (close to middle of puberty)

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7
Q

What are the female tanner stages

A

sexual maturation rating (SMR)
* breast development
* pubic hair growth

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8
Q

When does sexual maturation for males begin?

A

Starts 9.5 to 13.5 years of age and process is ~4 years in length

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9
Q

primary driver of sexual maturation in males

A

Testosterone
* increases testicular volume
* changes to external genitalia
* sperm production
* secondary sex characteristics

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10
Q

Tanner stages for males

A

Sexual Maturation Rating (SMR)
* genital development
* pubic hair growth

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11
Q

How do the stages of development occur?

A

Stages of development are consistent,
but duration and timing varies
* nutritional needs based on stage

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12
Q

What mediates increases in weight and height?

A

Sex hormones and growth hormones mediate increases in weight and height
* gains in bone mass, muscle, organs, blood volume, fat mass (females)

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13
Q

Normal Body Composition Changes in females

A

peak weight gain after peak height velocity and before menarche of both FM and LM but proportionatly more FM
* gain in fat mass (120%) > lean mass (44%)
* Increased proportion FM and decreased proportion LM

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14
Q

Normal Body Composition Changes in Males

A

peak weight gain coincides with peak
height velocity (occur together) with increased LM and decreased FM
* decreased proportion FM and increased proportion LM

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15
Q

Why has the age of menarche decreased?

A

Trend in age of menarche has gone down where it used to be ~13 year but now it is 9-10 year most significantly due to increased BMI associated with earlier puberty in girls
* Leptin is made in adipose tissue and play a role in regulating hormones driving female reproductive cycle which signals that energy stores are adequate for puberty to start
* Permissive signal: removes suppression of GnRH (hypothalamic-pituitary gonadal
axis) iniating menarche`

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16
Q

Role of Leptin in females

A

related to glutofemoral fat
* increase in leptin precede menarche by about 6 months and remains elevated

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17
Q

leptin in males

A

increases in leptin precede initiation of puberty, but leptin concentrations then decline

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18
Q

Consequences of very early age of first menses

A
  • social and behavioral impact
  • increased risk of: metabolic syndrome/PCOS & breast cancer
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19
Q

Cognitive Development

A

Switch from concrete to abstract thinking
* Early adolescence: concrete, egocentrism, impulsive behavior
* Middle adolescence: still concrete but starting abstract thinking
* Late adolescence: abstract thinking

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20
Q

Social Development

A

Starts ~12 years of age and continues until ~24 years of age with development of:
* independence (Getting a vehicle)
* self-identity
* body image
* relationships
* individual beliefs and behaviours related to lifestyle choices

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21
Q

Stages of social development

A

Early adolescence
* body image and awareness of sexuality
* peer influence strong

Middle Adolescence
* emotional and social independence from family; making decisions for self
* peer influence strongest

Later Adolescence
* personal identity and beliefs
* social confidence, less influence of peers

Early Adulthood
* completion of independence
* adult roles and responsibilities

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22
Q

Nutrition Knowledge

A

more advanced concepts
* types of nutrients, food sources, recommendations
* link between food choices and health including long term health

food skills
* shopping for food, planning meals, meal prep and cooking, budgeting

23
Q

What might advanced health knowledge look like?

A

Able to understand more complex concepts about health behaviours and determinants of health
* advertising and marketing
* socioeconomic
* Empowerment for themselves and others

24
Q

Role of adults for adolesence nutrition

A

allow them to have autonomy over their own health and know the consequences

25
Promotion of Health Behaviours
Messages about health in general directed at adolescents need to take into consideration: * development: cognitive and social * behavioural characteristics * youth culture and trends (coffee, fast food etc.)
26
Main factors affecting eating behavior
**Individual** * biological changes, attitudes, beliefs, preferences, self efficacy **Environment** * Family/home, school, extra-curricular activities, peers, norms **Macrosystems** * Availability, production, distribution, media/advertising, policy
27
Common eating behaviours
* Eating more meals away from home (schedule, independance) * snacking (ranges 1-7/d; usually higher in fats, sodium and sugar) * Meal Skipping (typically breakfast; decreased nutrient dense meal)
28
Diet Quality
mostly requires improvement or poor quality * non good quality | Based on recommendations in Eating Well with Canada’s Food Guide
29
Grain intake
large percentage below minimum serving of grains in females, not so much males
30
vegetables and fruits intake
Large percentage of both below reccomendations * females more than males
31
milk intake
large percent below for milk intake * females more than males * Calcium lacking!!
32
Adolescents – Why Don’t They Eat Healthy Foods?
* Habits of parents modelling * Marketing/ advertising * Not cool * Want to do things havent been able to do * Lack of availability and not enough variety at the home or school * Defiance * Dont realize consequences
33
Young Adults – Barriers to Healthy Eating
* unhealthy diet of friends and family * Cheapness and availability of unhealthy foods * Preference of unhealthy foods * Lack of time * Lack of knowledge * Lack of self-regulation; emotional response * Lack of motivation * Risk taking behaviour
34
Energy Intake Recommendations
Energy needs are higher than that of adults (per kg and absolute) for maintenance, growth and activity and is determined by tanner stage * Estimated energy expenditure: height, weight, age, physical activity level * Low intake: impaired growth and delayed sexual maturation * Excess intake: overweight/obesity
35
Macronutrient Recommendations
36
fibre intake stats
Median intake fibre: below AI boys and girls 14-18yrs | Canadian Community Health Survey (CCHS) 2.2 (2004):
37
AMDRs
38
What are the micronutrients of concern?
* Vitamin D and vitamin A prominently lacking * Ca and Mg lacking * Sodium above upper limit
39
Why is Ca so important?
Peak Ca accretion rate is highest in adolescence * females = 12.5 years * males = 14.0 years 40% of total lifetime bone mass is accumulated during 3-4 years of adolescence * if calcium intake from foods is inadequate, supplementation (Ca + D) during adolescence can increase bone mineral content * the more here, the longer it will take to get to fracture zone in later life
40
Importance of Muscle Mass Accretion
Prevents reaching the disability threshold in later life
41
Importance of iron
Increased demand for rapid rate of growth which includes increased blood volume Highest requirement: * **Males**: Peak growth rate * **Females**: After first menses
42
Iron DRIs
DRI: accounts for basal loss, maintenance of stores and growth; blood loss in females * Changers with tanner stage so DRI might depend where you are at in terms of puberty
43
Reasons why more female adolescents do not meet nutrient recommendations?
* Body image play a huge role * not eating at home as often * Skipping breakfast * Advertised diets of restrictions giving misleading information * SEM factors
44
What is poor body image associated with?
dieting behavior, disordered eating and clinical eating disorders. Body satisfaction in Canadian Youth * over half didn’t like something about body * Start to go down with age but only slightly * True for both males and females
45
Continuum of body image dysmorphia
Body Dissatisfaction ↓ Dieting Behaviors (restrictive behaviours) ↓ Disordered Eating ↓ Clinical Eating Disorders
46
Clinical Eating Disorders
* Anorexia nervosa (~0.2% to 1% of adolescents) * Bulimia Nervosa (~1% to 2% of adolescents) * Binge-Eating Disorder
47
How to deal with clinical eating disorders
Causes multi-factorial, but prevention has to include the promotion of positive body image and self-esteem * Thank about all aspects of food eating behaviour
48
What does Substance Use in Adolescence typically include
* includes tobacco, alcohol, recreational drugs * for most, experimentation only
49
Concerns with substance use
nutritional concerns are with chronic or excessive use * appetite suppression and low intake (alcohol replacing nutrition) * decreased nutrient absorption and increased losses * higher requirement of some nutrients * decreased financial resources for foods * Smoking would need more vitamin C
50
Prevalence of Adolescent Pregnancy
Globally, adolescents 15 to 19 years of age give birth to 16 million babies a year (10% of births) * Canada: 10,600 in 2014 (2.8% of births) * Rate 3x’s higher in low and middle income countries: marriage practices, absence of rights, poverty, low education
51
What are some concerns with adolescence pregnancy?
Increased risk of poor maternal and fetal/infant outcomes since the female is still growing and still has high demand for nutrients for herself, and then requirement during pregnancy creates compounding situation * mom: maternal mortality, anemia, postpartum weight retention * baby: stillbirth, neonatal mortality, low birthweight, prematurity * low rates of breastfeeding * poor dietary intake (quality, quantity)
52
Main nutritional issues with adolescent pregnancy
Competition between maternal and fetal growth * demands for maternal growth (increased height and weight associated with normal development * demands for pregnancy (maternal and fetal tissues) and lactation | In adolescent the calcium coming from her bone does not not go back on
53
Nutritional recommendations for adolescent pregnancy
* Same as for pregnancy and lactation in adulthood but higher energy and some minerals (calcium, phosphorus, magnesium, zinc, iron) greater need for nutrition support (consult with dietitian, resources)