Over 4 million people die each year as a result of being overweight or obese, according to the World Health Organization (WHO). The global prevalence of overweight or obese children and adolescents aged 5–19 years increased more than four-fold from 4 per cent in 1975 to 18 per cent in 2016, as per its estimates. You are overweight if your body mass index (BMI) is over 25, and obese if it is over 30. Excessive fat accumulation in the body can lead to many health problems. In fact, obesity is considered the mother of all diseases. It is linked to increased risk of heart disease, diabetes, high blood pressure and certain cancers. The more weight a person has, the higher the risk of developing these health issues and losing weight is the best way to decrease the risk. Millions of people are also trying to lose weight for cosmetic reasons. Diet (that is reducing the number of calories you eat) and exercise (which helps increase metabolism, or calories you burn in a day) are the key to weight loss and maintaining it. But people also tend to eat more after exercise compared to when they don’t exercise.