Diet and Weight Management ( PART 2)

Classification of Overweight and Obesity by Body Mass Index (BMI)
Index (BMI)

Category[12]          BMI

Underweight          < 18.5

Normal Weight      18.5 – 24.9

Overweight 25.0 – 29.9

Obesity (Class I)    30.0 – 34.9

Obesity (Class II)   35.0 – 39.9

Obesity (Class III)  40.0

This is the World Health Organization’s (WHO) recommended body weight based on BMI values for adults. It is used for both men and women, aged 18 or older.

Category   BMI range – kg/m2

Severe Thinness         < 16

Moderate Thinness    16 – 17

Mild Thinness   17 – 18.5

Normal      18.5 – 25

Overweight        25 – 30

Obese Class I      30 – 35

Obese Class II    35 – 40

Obese Class III   > 40

 Risks associated with being overweight

Being overweight increases the risk of a number of serious diseases and health conditions. Below is a list of said risks, according to the Centers for Disease Control and Prevention (CDC):

  • High blood pressure
  • Higher levels of LDL cholesterol, which is widely considered « bad cholesterol,«  lower levels of HDL cholesterol, considered to be good cholesterol in moderation, and high levels of triglycerides
  • Type II diabetes
  • Coronary heart disease
  • Stroke
  • Gallbladder disease
  • Osteoarthritis, is a type of joint disease caused by the breakdown of joint cartilage
  • Sleep apnea and breathing problems
  • Certain cancers (endometrial, breast, colon, kidney, gallbladder, liver)
  • Low quality of life
  • Mental illnesses such as clinical depression, anxiety, and others
  • Body pains and difficulty with certain physical functions
  • Generally, an increased risk of mortality compared to those with a healthy BMI

As can be seen from the list above, there are numerous negative, in some cases fatal, outcomes that may result from being overweight. Generally, a person should try to maintain a BMI below 25 kg/m2, but ideally should consult their doctor to determine whether or not they need to make any changes to their lifestyle in order to be healthier.

Risks associated with being underweight

Being underweight has its own associated risks, listed below:

  • Malnutrition, vitamin deficiencies, anemia (lowered ability to carry blood vessels)
  • Osteoporosis, a disease that causes bone weakness, increasing the risk of breaking a bone
    A decrease in immune function
  • Growth and development issues, particularly in children and teenagers
  • Possible reproductive issues for women due to hormonal imbalances that can disrupt the menstrual cycle. Underweight women also have a higher chance of miscarriage in the first trimester
  • Potential complications as a result of surgery
  • Generally, an increased risk of mortality compared to those with a healthy BMI
  • In some cases, being underweight can be a sign of some underlying condition or disease such as anorexia nervosa, which has its own risks. Consult your doctor if you think you or someone you know is underweight, particularly if the reason for being underweight does not seem obvious