The occurrence of obesity is complex in nature. Usually, more than one factor may influence the occurrence of the condition.
Age: Obesity can occur at any age. But as a person grows old his risk of being obese may increase. Reduced activity level and metabolic rate (rate at which the body burns calories) may contribute to age-related obesity, if lifestyle modifications are not done accordingly.
Genetic factors: The genes of obesity runs in the family. Inheritance of these genes makes a person more vulnerable to adapt to similar eating habits, which may increase the risk of obesity.
Gender: The metabolic rate is higher in men than in women. So, women are more likely to develop obesity than men. Hormonal changes are an additional factor that makes a woman more susceptible to the condition.
Lifestyle: A sedentary lifestyle may slowly progress to obesity. Spending time in front of televisions and mobile is the major reason for weight gain. Consuming energy-dense foods loaded with calories, such as fast foods, sugary drinks, and oversized portions, are the major contributors to obesity.
Sleep: Low-quality sleep is associated with hormonal changes, which may adversely affect appetite and food choices. It also affects the extent of the physical activity of a person, which may lead to obesity.
Other factors that may influence obesity include socioeconomic status, certain medicines, and certain medical conditions that interfere with the physical activity of a person.