Although there are genetic and hormonal influences on body weight, obesity occurs when you take in more calories than you burn through exercise and normal daily activities. Your body stores these excess calories as fat. Obesity usually results from a combination of causes and contributing factors, including:
1. Unhealthy diet and eating habits
Having a diet that’s high in calories, eating fast food, skipping breakfast, eating most of your calories at night, drinking high-calorie beverages and eating oversized portions all contribute to weight gain.
During pregnancy, a woman’s weight necessarily increases. Some women find this weight difficult to lose after the baby is born. This weight gain may contribute to the development of obesity in women.
3. Lack of sleep
Getting less than seven hours of sleep a night can cause changes in hormones that increase your appetite. You may also crave foods high in calories and carbohydrates, which can contribute to weight gain.
4. Diseases and drugs
Some illnesses may lead to obesity or weight gain. These may include Cushing’s disease, hypothyroidism, depression and polycystic ovary syndrome. Drugs such as steroids and some antidepressants may also cause weight gain. Also, drugs such as steroids and some antidepressants may cause weight gain.
5. Medical problems
Obesity can sometimes be traced to a medical cause, such as Prader-Willi syndrome, Cushing’s syndrome, polycystic ovary syndrome, and other diseases and conditions. Some medical problems, such as arthritis, can lead to decreased activity, which may result in weight gain. A low metabolism is unlikely to cause obesity, as is having low thyroid function.
6. The Gene, GAD2
Your genes may affect the amount of body fat you store and where that fat is distributed. Genetics may also play a role in how efficiently your body converts food into energy and how your body burns calories during exercise. Even when someone has a genetic predisposition, environmental factors ultimately make you gain more weight.
7. Lack of Physical Activity
Remote control, video games, automobiles, television, and to some extent computers are all part of the environment which discourage people from being physically active. Our bodies need calories for daily functions such as breathing, digestion, and daily activities. Weight gain occurs when calories consumed exceed this need. Physical activity plays a key role in energy balance because it uses up calories consumed.
8. Energy imbalance
Weight gain or loss is caused when there is an imbalance between the calories consumed and the calories used.
Weight gain: Calories consumed > Calories used
Weight loss: Calories consumed < Calories used No change: Calories consumed = Calories used
9. Negative emotions
Many people eat in response to negative emotions such as boredom, sadness, or anger. It has been observed that women with the most severe binge eating problems are also likely to have symptoms of depression and low self-esteem. These women may have more difficulty losing weight and keeping it off than people without binge eating problems. During a binge eating episode, people eat large amounts of food and feel that they cannot control how much they are eating.
10. Early menarche
Early menarche is clearly associated with degree of overweight, with a twofold increase in rate of early menarche associated with BMI greater than the 85th percentile. Effects of age at menarche and race/ethnicity on overweight were estimated via logistic regression, after adjustment for socio-demographic characteristics, in a sample of 6507 Hispanic, Black, White, and Asian American girls who participated in wave 2 of the National Longitudinal Study of Adolescent Health. The Results indicated that, Overweight prevalence rates were significantly higher in early maturing adolescents of all racial/ethnic groups but highest (57.5%) among early maturing Black girls. Early maturation nearly doubled the odds of being overweight.