obesity and nutrition
DESCRIPTION
popular science on obesity and nutritionTRANSCRIPT
Outlines
What is obesity?
Harmness of obesity?
How to diagnose obesity?
What causes obesity?
How to treat obesity by nutrition?
What is obesity?
An abnormal accumulation of body fat, usually 20 percent or more over an individual’s ideal body weight.
Harmness of obesity?
Heart disease
Stroke
Breath hard
Fatty liver
Gall-stone
Hampered sexuality
Diabetes
Arthritis
Misfortunes (obesity) never come singly
Use a expensive machine to quantify the weight of body fat
How to diagnose obesity?
How to diagnose obesity by a
cheap and convenient way?
Body mass index (BMI) is defined as the individual's body mass divided by the square of his or her height.
BMI, an widely used index for obesity
Requirement:
1. Early morning
2. Fasting state (have not breakfast)
3. Emptying feces and urine
4. Wearing a vest shirt and shorts
Western countries: BMI≥30
China: BMI≥28
Strong but not obesity
What causes obesity?
Type I: Primary obesity (genetic factors)
Energy
expenditure Energy intake
Type II:Secondary obesity(disruption in energy balance)
90% obesity belongs to the secondary type
How to treat obesity?
Obesity therapy by reducing energy intake
Which nutrients could provide energy ?
1. carbohydrate
2. protein
3. fat
4. mineral
5. vitamin
6. fibre
7. water
EnergyNutrients
1 g= 4 kcal
1 g= 4 kcal
1 g= 9 kcal
Key points to prevent/treat obesity by modulation of diets
Healthy individual Obesity individual
Total energy intake
Protein
Fat
Carbohydrate
2420 Kcal 1935 Kcal 20%
242 Kcal 484 Kcal
605 Kcal
1573 Kcal
194 Kcal
1275 Kcal
200%
310%
19%