lecture 9: nutrition for older adults Flashcards
what is considered an ‘older adult’?
65 years +
what are factors surrounding “the golden years”?
- retirement
- increasing in eating out and alcohol consumption
- connectivity to community
- social groups
- volunteering
- provision of childcare
what are important factors with advancing years?
- increasing illness and injury
- home support required to complete daily tasks
- transition into aged care home if care needs are too great
what are the physiological changes with age?
senescence: cellular deterioration with ageing
- signals an increased risk of disability, disease and death
- systems begin to slow and degenerate
sensory loss
- alteration to sight, hearing, smell and taste (less taste buds)
- dysgeusia: abnormal taste perception
- medication use can alter these senses
neurological function
- reduced cognition due to ageing or dementia
- depression
what are the physical changes with age - gastrointestinal?
xerostomia: declined salivary production
dysphagia: difficulty swallowing foods
poor dentition: difficulty swallowing foods
achlorhydria: low gastric HCL production, limits calcium, iron, folate, vitamin B12 absorption
gut microbiota
- increased inflammation
-decreased immune function of GI tract
- impaired functioning of gut mucosal cells
- bacterial growth
what are the gradual body composition changes?
DECREASED
- mineral and water reserves
- fat free mass
- bone mineral density
INCREASED
- fat mass
from 20-70 the average man loses 11kg of muscle and gains 10kg fat
what are the changes to organ function with age?
- less adaptable to environmental or physiologic stressors
- kidneys: less able to concentrate waste (loss of nephrons)
- liver: less efficient in breaking down drugs
- pancreas: reduced blood glucose control
- bladder control may decline
- respiratory - declining vital capacity
- connective tissue and blood vessels become increasingly stiff and less pliable (increasing blood pressure)
- neurons in the brain decrease: impaired memory, reflexes, coordination
- decreased production of hormones: testosterone and growth hormone
independent on the person not everyone experiences all these - depends on life style prior to being an older adult
what are the changes to BMR?
- decreased energy needs from loss of muscle mass and lean tissue
- lower basal metabolic rate
- reduced activity levels
what are the macronutrient requirements for older adults
protein, carbohydrate and fat within acceptable macronutreint distribution range (AMDR) as per adulthood recommendations
protein requirements INCREASES 70+
- 1-1.2g/kg/day
- 1.5g/kg/day is they have an acute or chronic conditions
- 25-30g per meal <- IMPORTANT less HCL production + more trouble breaking down food so space protein consumption throughout the day to appropriately absorb
fibre as per adulthood recommendations - important to help relive constipation caused by medication
water - same as adult recommendations. reduced thirst perception, decline kidney function and use of medication means its very important for elderly to stay hydrated
what are the micronutrients requirements for older adults
- iron decreases for women after 51 years - because of menopause
- calcium increases for women after 51 and mean after 70 - effect of menopause has on bone mineral density
- requirements for B2, B6 and D increase - challenges with absorption in older adults
- vitamin B12 - requirements dont change but there can be impaired absorption
why is there a call for new dietary guidelines for people over 70?
- current guidelines are inappropriate
- difficulty for food providers to plan appropriate meals
- nutrition for older people is not discussed in public health campaigns
- little data on nutritional intake for older adults
how do the current Australian dietary guideline relate to older adults
all apply but particularly…
guideline 1: eating nutritious foods and keeping physically active to help maintain muscle strength and a healthy weight
guideline 5: care for your food; prepare and store is safely
who do the guidelines NOT apply to
people with medical conditions requiring specialised advice, or to frail elderly people who are at risk of malnutrition
what are the physical activity guidelines for older adults
requirements same but exercise looks different - do what they can and encouraged
do older adults meet recommended nutrient requirements? and biggest areas on concern
no
protein and calcium
overweight, obesity, chronic disease
what are nutrient concerns surrounding age and physiology
sensory loss
- less interest/ enjoyment in food
neurological function
- ability to shop/ prepare food safely
- loss of interest in eating (depression)
dentition, salivary glands, dysphagia
- avoidance of tough foods, e.g. meat
- dry mouth - increased difficulty eating
- alteration of the texture of foods - can decrease intake
early satiety
- potential decreased sensitivity to grehlin
- changes in the function of cholecystokinin (CCK)
- abnormalities in gastric motility
- overwhelmed by the amount of food on the plate
what are the major problems with not consuming enough food? and why is it important?
unintentional weight loss and malnutrition = loss of subcutaneous fat and muscle wasting
skin integrity
- slow or non-healing wounds
- increased risk of pressure ulcers
increased frailty
- reduced mobility
- increased disability
impaired immune function
- delayed recovery
- recurrent infections
hospitalisation
- increased hospitalisation rates
- increased length of stay
increased risk of mortality
signs someone is malnourised
pinch test - just feel skin no fat
sunken in eyes
visible collar and shoulder bones