People gain weight when they consume more calories than they expend, so eating fewer calories, or energy, can help. Other factors, such as genetics, metabolism, hormones, the sort of food you eat, your body type, and your lifestyle, all play a part. Obesity is a multifaceted, chronic, relapsing pandemic described as the abnormal or excessive accumulation of body fat caused by genetic, biochemical, microbiological, and environmental variables that promote a positive energy balance, mostly related to increased intake and decreased consumption. Obesity is the result of numerous multisystem illnesses, such as cardiovascular disease, type 2 diabetes, cancers, sleep apnoea, and others, and it greatly raises mortality rates while also accounting for a major increase in health costs. The strategies and physiological processes that contribute to a person's capacity to achieve and maintain a given weight are referred to as weight management. The majority of weight-loss treatments include long-term lifestyle recommendations that encourage healthy eating and regular physical activity.