B o d y m a s s i n d e x •
F ig u r e 1 4 . 1 6
Body m ass index (BMI) is a ratio of height to w eight th a t is used to track
overw eight and obesity. BMI is calculated by dividing your w eig h t (in kilo-
gram s) by th e sq u a re of your h eig h t (in m eters). T hose nu m b ers are show n
in th e body of th e tab le, w ith th e m ore fam iliar U.S. units a t th e to p and
sid es for your reference. O verw eight is defined
as a BMI = 25 -3 0 , and o b esity is defined as a
BMI g re a te r th a n 30. W here your height and
w eight intersect, your BMI tells you w h eth er you
are underw eight, a t a healthy w eight, over-
w eight, or obese. BMI is only a rough estim ate
4,g„
of the am ount of body fat; it d o es n o t take into
accoun t m uscular build or b on e density.
4
'io"
5'0"
5'2"
<
/)
JZ
5'4"
0
_c
1
5'6"
!i!
5'8"
Weight in Pounds
120
130
140
150
160
170
180
190
200
210
220
230
240
250
c
£
5'10"
_o)
<D
x
6'0"
6'2"
6'4"
6'6"
6'8"
29
31
34
36
39
41
43
46
48
51
53
56
58
60
27
29
31
34
36
38
40
43
45
47
49
52
54
56
25
27
29
31
34
36
38
40
42
44
46
48
50
52
23
25
27
29
31
33
35
37
39
41
43
45
47
49
22
24
26
27
29
31
33
35
37
38
40
42
44
46
21
22
24
26
28
29
31
33
34
36
38
40
41
43
19
21
23
24
26
27
29
31
32
34
36
37
39
40
18
20
21
23
24
26
27
29
30
32
34
35
37
38
17
19
20
22
23
24
26
27
29
30
32
33
35
36
16
18
19
20
22
23
24
26
27
28
30
31
33
34
15
17
18
19
21
22
23
24
26
27
28
30
31
32
15
16
17
18
20
21
22
23
24
26
27
28
29
30
14
15
16
17
19
20
21
22
23
24
25
27
28
29
13
14
15
17
18
19
20
21
22
23
24
25
26
28
a. Underweight
If you are 6'0" tall and
b. Healthy weight
weigh 210 pounds, you
c. Overweight
would be considered:
d. Obese
Underweight
Q Healthy weight
Q Overweight
Q Obese
Energy inputs
- Energy expenditures
= Change in body weight
Behavior therapy, which is used to change lifestyle, in-
volves increasing physical activity, eliminating binge or
emotional eating, and watching your diet (monitoring
your caloric intake, frequency of meals and snacks, and
types of foods that you eat—see
W h a t a H e a lth P rovider
Sees
on the next page). If a health care provider assesses
obesity as severe, then drug therapies may be instituted;
most Food and Drug Administration (FDA)-approved
obesity drugs target appetite suppression, while one tar-
gets absorption of fat in the small intestine. Extreme
obesity may warrant surgical interventions, such as gas-
tric bypass or gastric banding. These surgeries limit the
capacity of the stomach to store food.
G a stric bypass
is a
complex, irreversible surgery in which a portion of the
stomach is removed.
G a stric b a n d in g
is a reversible pro-
cedure in which a band is placed around a portion of the
stomach to reduce its size; this procedure has become
a more popular technique. Some bands can be adjusted
to vary the available size of the stomach as weight loss
progresses.
Diabetes and Obesity Are Metabolic Disorders 425
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