Gaining and losing weight is a standard process in the body. However, some people do not easily lose the weight they gain, leading to excessive weight gain and obesity. Therefore, returning the balance in the body should help lose weight proportional to gaining weight.

However, losing weight requires understanding what causes the sudden weight gain. People who fail to lose weight may experience body weight changes, often causing obesity. But which common factors cause weight gain and obesity? Here are some ideas.

1. Lack of Physical Activity

Inactivity is the leading cause of weight gain. We get energy through our food and usually use it up through daily activities. Energy is converted into calories and is stored in the body. However, if the body does not use these calories, they are converted into fat.

Inactivity can lead to weight gain, especially if combined with poor nutrition. Therefore, it is best to keep an active lifestyle. Try to exercise once in a while, keep things moving, or find a physical activity that works best with your schedule and interest.

2. Genetics

Genetics is a factor that can cause people to gain weight. Some people are more prone to carrying extra weight due to their genetic makeup. If a family member is obese, you are more likely to become obese. Genetics can slow down the metabolism or allow the body to carry more fat cells.

People experiencing obesity through genetics may need to do more than those who gain weight for other reasons. It may include more restrictive diets and more intense exercise regimens. Additionally, medications or surgery may be necessary in some cases.

3. Calorie Intake

The amount of calories a person consumes is a significant factor in their weight. People will gain weight if they consume more calories than their body uses. On the contrary, those who consume fewer calories than their body needs will lose weight.

Most people need 2,000 to 2,500 calories a day to maintain their weight. For best results, try to know the exact amount of calories your body needs based on your age, gender, and goal weight. There are now smartphone applications that calculate the calorie intake required every day.

4. Medical Problems

Some health problems will cause a person to gain weight. For instance, Cushing’s syndrome can increase the cortisol levels in the body, resulting in weight gain, mood swings, and fatigue. Sometimes, medical problems may hinder a patient’s efforts to lose weight.

Meanwhile, polycystic ovary syndrome is another medical problem that can cause obesity. This condition can cause weight gain, irregular or absent periods, insulin resistance, and fertility problems. Try to visit a medical expert immediately and get the health problems checked.

5. Medications Used

Some medications can cause a person to gain weight. For instance, drugs used to treat mental health disorders, such as antidepressants and antipsychotics, can cause weight gain. These medications boost “feel good” chemicals, affecting a patient’s appetite.

Some drugs used to treat diabetes, high blood pressure, and seizures can also lead to weight gain. If you are on medications that can cause weight gain, don’t stop taking the drugs without consulting your doctor first.


Obesity is a common, severe, and costly disease in the US. It is a risk factor for many chronic diseases, including heart disease, stroke, and type 2 diabetes. Meanwhile, obesity is a complex problem with many causes like genetics, lifestyle, and environment.

However, a quick lifestyle change should reverse obesity and its effects. The best way to prevent obesity is to make healthy lifestyle choices. Eating a healthy diet and being physically active can help prevent obesity.

Melinda Silva, MD, offers weight management consulting for patients wanting to lose weight safely and healthily. However, we also offer anti-aging hormones to prevent premature aging, prolonging younger-looking skin through CoolSculpting. Book an appointment with an anti-aging doctor near Chula Vista and bring out your best self!